我有以下列举:

public enum AuthenticationMethod
{
    FORMS = 1,
    WINDOWSAUTHENTICATION = 2,
    SINGLESIGNON = 3
}

然而问题是,当我请求AuthenticationMethod时,我需要“FORMS”这个词。表单而不是id

对于这个问题,我找到了以下解决方案(链接):

首先,我需要创建一个自定义属性“StringValue”:

public class StringValue : System.Attribute
{
    private readonly string _value;

    public StringValue(string value)
    {
        _value = value;
    }

    public string Value
    {
        get { return _value; }
    }

}

然后我可以将这个属性添加到我的枚举器中:

public enum AuthenticationMethod
{
    [StringValue("FORMS")]
    FORMS = 1,
    [StringValue("WINDOWS")]
    WINDOWSAUTHENTICATION = 2,
    [StringValue("SSO")]
    SINGLESIGNON = 3
}

当然,我需要一些东西来检索StringValue:

public static class StringEnum
{
    public static string GetStringValue(Enum value)
    {
        string output = null;
        Type type = value.GetType();

        //Check first in our cached results...

        //Look for our 'StringValueAttribute' 

        //in the field's custom attributes

        FieldInfo fi = type.GetField(value.ToString());
        StringValue[] attrs =
           fi.GetCustomAttributes(typeof(StringValue),
                                   false) as StringValue[];
        if (attrs.Length > 0)
        {
            output = attrs[0].Value;
        }

        return output;
    }
}

很好,现在我已经有了工具来获取枚举器的字符串值。 然后我可以这样使用它:

string valueOfAuthenticationMethod = StringEnum.GetStringValue(AuthenticationMethod.FORMS);

好的,现在所有这些工作就像一个魅力,但我发现它有很多工作。我想知道有没有更好的解决办法。

我还尝试了一些字典和静态属性,但这也不是更好。


使用方法

Enum.GetName(Type MyEnumType,  object enumvariable)  

如(假设Shipper是一个已定义的Enum)

Shipper x = Shipper.FederalExpress;
string s = Enum.GetName(typeof(Shipper), x);

Enum类上还有很多其他的静态方法也值得研究……


不幸的是,在枚举上获取属性的反射非常慢:

看这个问题:有人知道一种快速获取枚举值的自定义属性的方法吗?

. tostring()在枚举上也相当慢。

你可以为枚举写扩展方法:

public static string GetName( this MyEnum input ) {
    switch ( input ) {
        case MyEnum.WINDOWSAUTHENTICATION:
            return "Windows";
        //and so on
    }
}

这不是很好,但是很快,而且不需要对属性或字段名进行反射。


c# 6更新

如果你可以使用c# 6,那么操作符的新名称适用于枚举,因此nameof(myenume .WINDOWSAUTHENTICATION)将在编译时转换为“WINDOWSAUTHENTICATION”,使其成为获取枚举名称的最快方式。

注意,这将显式枚举转换为内联常量,因此它不适用于变量中的枚举。所以:

nameof(AuthenticationMethod.FORMS) == "FORMS"

但是…

var myMethod = AuthenticationMethod.FORMS;
nameof(myMethod) == "myMethod"

可以使用ToString()引用名称而不是值

Console.WriteLine("Auth method: {0}", AuthenticationMethod.Forms.ToString());

文档在这里:

http://msdn.microsoft.com/en-us/library/16c1xs4z.aspx

...如果你在Pascal情况下命名你的枚举(如ThisIsMyEnumValue = 1等),那么你可以使用一个非常简单的正则表达式来打印友好的形式:

static string ToFriendlyCase(this string EnumString)
{
    return Regex.Replace(EnumString, "(?!^)([A-Z])", " $1");
}

可以很容易地从任何字符串调用:

Console.WriteLine("ConvertMyCrazyPascalCaseSentenceToFriendlyCase".ToFriendlyCase());

输出:

把我疯狂的帕斯卡格句转换成友好格句

这节省了在房子周围运行创建自定义属性并将它们附加到枚举或使用查找表将枚举值与友好字符串结合,最好的是它是自我管理的,可以用于任何Pascal Case字符串,这是无限可重用的。当然,它不允许您使用与解决方案提供的枚举不同的友好名称。

不过,我确实喜欢你针对更复杂场景的原始解决方案。你可以把你的解决方案更进一步,让你的GetStringValue成为你的枚举的扩展方法,然后你就不需要像StringEnum.GetStringValue…

public static string GetStringValue(this AuthenticationMethod value)
{
  string output = null;
  Type type = value.GetType();
  FieldInfo fi = type.GetField(value.ToString());
  StringValue[] attrs = fi.GetCustomAttributes(typeof(StringValue), false) as StringValue[];
  if (attrs.Length > 0)
    output = attrs[0].Value;
  return output;
}

然后你可以直接从你的枚举实例中访问它:

Console.WriteLine(AuthenticationMethod.SSO.GetStringValue());

试试type-safe-enum模式。

public sealed class AuthenticationMethod {

    private readonly String name;
    private readonly int value;

    public static readonly AuthenticationMethod FORMS = new AuthenticationMethod (1, "FORMS");
    public static readonly AuthenticationMethod WINDOWSAUTHENTICATION = new AuthenticationMethod (2, "WINDOWS");
    public static readonly AuthenticationMethod SINGLESIGNON = new AuthenticationMethod (3, "SSN");        

    private AuthenticationMethod(int value, String name){
        this.name = name;
        this.value = value;
    }

    public override String ToString(){
        return name;
    }

}

更新 显式(或隐式)类型转换可以通过

adding static field with mapping private static readonly Dictionary<string, AuthenticationMethod> instance = new Dictionary<string,AuthenticationMethod>(); n.b. In order that the initialisation of the the "enum member" fields doesn't throw a NullReferenceException when calling the instance constructor, be sure to put the Dictionary field before the "enum member" fields in your class. This is because static field initialisers are called in declaration order, and before the static constructor, creating the weird and necessary but confusing situation that the instance constructor can be called before all static fields have been initialised, and before the static constructor is called. filling this mapping in instance constructor instance[name] = this; and adding user-defined type conversion operator public static explicit operator AuthenticationMethod(string str) { AuthenticationMethod result; if (instance.TryGetValue(str, out result)) return result; else throw new InvalidCastException(); }


我使用系统中的Description属性。ComponentModel名称空间。简单地装饰枚举,然后使用下面的代码来检索它:

public static string GetDescription<T>(this object enumerationValue)
            where T : struct
        {
            Type type = enumerationValue.GetType();
            if (!type.IsEnum)
            {
                throw new ArgumentException("EnumerationValue must be of Enum type", "enumerationValue");
            }

            //Tries to find a DescriptionAttribute for a potential friendly name
            //for the enum
            MemberInfo[] memberInfo = type.GetMember(enumerationValue.ToString());
            if (memberInfo != null && memberInfo.Length > 0)
            {
                object[] attrs = memberInfo[0].GetCustomAttributes(typeof(DescriptionAttribute), false);

                if (attrs != null && attrs.Length > 0)
                {
                    //Pull out the description value
                    return ((DescriptionAttribute)attrs[0]).Description;
                }
            }
            //If we have no description attribute, just return the ToString of the enum
            return enumerationValue.ToString();

        }

举个例子:

public enum Cycle : int
{        
   [Description("Daily Cycle")]
   Daily = 1,
   Weekly,
   Monthly
}

这段代码很好地满足了不需要“友好名称”的枚举,只返回枚举的. tostring()。


我同意基斯的意见,但我还不能投票。

我使用一个静态方法和swith语句来返回我想要的结果。在数据库中,我存储tinyint和我的代码只使用实际的enum,所以字符串是为UI需求。经过大量的测试,这导致了最好的性能和最好的控制输出。

public static string ToSimpleString(this enum)
{
     switch (enum)
     {
         case ComplexForms:
             return "ComplexForms";
             break;
     }
}

public static string ToFormattedString(this enum)
{
     switch (enum)
     {
         case ComplexForms:
             return "Complex Forms";
             break;
     }
}

然而,根据某些说法,这可能会导致维护的噩梦和一些代码异味。我试着留意那些很长很多的枚举,或者那些经常变化的枚举。除此之外,这对我来说是一个很好的解决方案。


选项1:

public sealed class FormsAuth
{
     public override string ToString{return "Forms Authtentication";}
}
public sealed class WindowsAuth
{
     public override string ToString{return "Windows Authtentication";}
}

public sealed class SsoAuth
{
     public override string ToString{return "SSO";}
}

然后

object auth = new SsoAuth(); //or whatever

//...
//...
// blablabla

DoSomethingWithTheAuth(auth.ToString());

选项2:

public enum AuthenticationMethod
{
        FORMS = 1,
        WINDOWSAUTHENTICATION = 2,
        SINGLESIGNON = 3
}

public class MyClass
{
    private Dictionary<AuthenticationMethod, String> map = new Dictionary<AuthenticationMethod, String>();
    public MyClass()
    {
         map.Add(AuthenticationMethod.FORMS,"Forms Authentication");
         map.Add(AuthenticationMethod.WINDOWSAUTHENTICATION ,"Windows Authentication");
         map.Add(AuthenticationMethod.SINGLESIGNON ,"SSo Authentication");
    }
}

我使用了上述几个建议的组合,并结合了一些缓存。现在,我从网上找到的一些代码中得到了这个想法,但我既不记得是从哪里得到的,也不记得是怎么找到的。所以如果有人发现了一些相似的东西,请在归因处发表评论。

无论如何,使用涉及到类型转换器,所以如果你绑定到UI,它'只是工作'。您可以使用Jakub的模式进行扩展,通过从类型转换器初始化到静态方法来实现快速代码查找。

基本使用量是这样的

[TypeConverter(typeof(CustomEnumTypeConverter<MyEnum>))]
public enum MyEnum
{
    // The custom type converter will use the description attribute
    [Description("A custom description")]
    ValueWithCustomDescription,

   // This will be exposed exactly.
   Exact
}

自定义枚举类型转换器的代码如下:

public class CustomEnumTypeConverter<T> : EnumConverter
    where T : struct
{
    private static readonly Dictionary<T,string> s_toString = 
      new Dictionary<T, string>();

    private static readonly Dictionary<string, T> s_toValue = 
      new Dictionary<string, T>();

    private static bool s_isInitialized;

    static CustomEnumTypeConverter()
    {
        System.Diagnostics.Debug.Assert(typeof(T).IsEnum,
          "The custom enum class must be used with an enum type.");
    }

    public CustomEnumTypeConverter() : base(typeof(T))
    {
        if (!s_isInitialized)
        {
            Initialize();
            s_isInitialized = true;
        }
    }

    protected void Initialize()
    {
        foreach (T item in Enum.GetValues(typeof(T)))
        {
            string description = GetDescription(item);
            s_toString[item] = description;
            s_toValue[description] = item;
        }
    }

    private static string GetDescription(T optionValue)
    {
        var optionDescription = optionValue.ToString();
        var optionInfo = typeof(T).GetField(optionDescription);
        if (Attribute.IsDefined(optionInfo, typeof(DescriptionAttribute)))
        {
            var attribute = 
              (DescriptionAttribute)Attribute.
                 GetCustomAttribute(optionInfo, typeof(DescriptionAttribute));
            return attribute.Description;
        }
        return optionDescription;
    }

    public override object ConvertTo(ITypeDescriptorContext context, 
       System.Globalization.CultureInfo culture, 
       object value, Type destinationType)
    {
        var optionValue = (T)value;

        if (destinationType == typeof(string) && 
            s_toString.ContainsKey(optionValue))
        {
            return s_toString[optionValue];
        }

        return base.ConvertTo(context, culture, value, destinationType);
    }

    public override object ConvertFrom(ITypeDescriptorContext context, 
       System.Globalization.CultureInfo culture, object value)
    {
        var stringValue = value as string;

        if (!string.IsNullOrEmpty(stringValue) && s_toValue.ContainsKey(stringValue))
        {
            return s_toValue[stringValue];
        }

        return base.ConvertFrom(context, culture, value);
    }
}

}


当我遇到这样的问题时,我首先会试图找到以下几个问题的答案:

枚举值的名称是否足够友好,或者我需要提供更友好的名称? 我需要往返吗?也就是说,我是否需要将文本值解析为枚举值? 这是我需要为我的项目中的许多枚举做的事情,还是只有一个? 我将在什么样的UI元素中呈现这些信息-特别是,我将绑定到UI,还是使用属性表? 这需要本地化吗?

最简单的方法是使用Enum。GetValue(并使用枚举. parse支持往返)。正如Steve Mitcham所建议的那样,构建一个TypeConverter来支持UI绑定通常也是值得的。(在使用属性表时,没有必要构建TypeConverter,这是属性表的优点之一。尽管天晓得他们也有自己的问题。)

一般来说,如果上述问题的答案表明这是行不通的,我的下一步是创建和填充一个静态Dictionary<MyEnum,字符串>,或者可能是一个Dictionary<Type, Dictionary<int,字符串>>。我倾向于跳过中间的用属性装饰代码的步骤,因为接下来通常需要在部署后更改友好值(通常,但不总是,因为本地化)。


如果你想一下我们要解决的问题,它根本不是我们需要的枚举。我们需要一个对象,它允许一定数量的值相互关联;换句话说,定义一个类。

Jakub Šturc的类型安全enum模式是我在这里看到的最佳选择。

看看它:

它有一个私有构造函数,因此只有类本身可以定义允许的值。 它是一个密封类,因此不能通过继承修改值。 它是类型安全的,允许您的方法只需要该类型。 访问这些值不会对反射性能造成影响。 最后,可以修改它以将两个以上的字段关联在一起,例如Name、Description和numeric Value。


基于MSDN: http://msdn.microsoft.com/en-us/library/cc138362.aspx

foreach (string str in Enum.GetNames(typeof(enumHeaderField)))
{
    Debug.WriteLine(str);
}

STR将是字段的名称


我想把这篇文章作为下面引用的帖子的评论,但不能,因为我没有足够的代表。代码包含一个错误,我想向试图使用这个解决方案的个人指出这一点:

[TypeConverter typeof (CustomEnumTypeConverter (typeof (MyEnum))) public enum MyEnum { //自定义类型转换器将使用description属性 [描述(“自定义描述”)] ValueWithCustomDescription, //这将完全暴露。 确切的 }

应该是

[TypeConverter(typeof(CustomEnumTypeConverter<MyEnum>))]
public enum MyEnum
{
  // The custom type converter will use the description attribute
  [Description("A custom description")]
  ValueWithCustomDescription,

  // This will be exposed exactly.
  Exact
}

使用对象枚举. parse(系统。类型枚举类型,字符串值,bool ignoreCase);从http://blogs.msdn.com/b/tims/archive/2004/04/02/106310.aspx获取


我发现的Enums国际化或从各自的资源文件获取Enums文本的方法是通过继承DescriptionAttribute类创建一个属性类

public class EnumResourceAttribute : DescriptionAttribute
{

    public Type ResourceType { get; private set; }
    public string ResourceName { get; private set; }
    public int SortOrder { get; private set; }
    public EnumResourceAttribute(Type ResourceType,
                         string ResourceName,
                         int SortOrder)
    {

        this.ResourceType = ResourceType;
        this.ResourceName = ResourceName;
        this.SortOrder = SortOrder;
    }
}

创建另一个Static类,为GetString和GetString提供扩展方法。

public static class EnumHelper
{
    public static string GetString(this Enum value)
    {
        EnumResourceAttribute ea =
       (EnumResourceAttribute)value.GetType().GetField(value.ToString())
        .GetCustomAttributes(typeof(EnumResourceAttribute), false)
         .FirstOrDefault();
        if (ea != null)
        {
            PropertyInfo pi = ea.ResourceType
             .GetProperty(CommonConstants.ResourceManager);
            if (pi != null)
            {
                ResourceManager rm = (ResourceManager)pi
                .GetValue(null, null);
                return rm.GetString(ea.ResourceName);
            }

        }
        return string.Empty;
    }


    public static IList GetStrings(this Type enumType)
    {
        List<string> stringList = new List<string>();
        FieldInfo[] fiArray = enumType.GetFields();
        foreach (FieldInfo fi in fiArray)
        {
            EnumResourceAttribute ea =
                (EnumResourceAttribute)fi
                     .GetCustomAttributes(typeof(EnumResourceAttribute), false)
                     .FirstOrDefault();
            if (ea != null)
            {
                PropertyInfo pi = ea.ResourceType
                                    .GetProperty(CommonConstants.ResourceManager);
                if (pi != null)
                {
                    ResourceManager rm = (ResourceManager)pi
                                          .GetValue(null, null);
                    stringList.Add(rm.GetString(ea.ResourceName));
                }
            }
        }
        return stringList.ToList();
    }
}

在Enum的元素上,你可以这样写:

public enum Priority
{
     [EnumResourceAttribute(typeof(Resources.AdviceModule), Resources.ResourceNames.AdviceCreateAdviceExternaPriorityMemberHigh, 1)]
    High,
     [EnumResourceAttribute(typeof(Resources.AdviceModule), Resources.ResourceNames.AdviceCreateAdviceExternaPriorityMemberRoutine, 2)]
    Routine
}

Where Resources.ResourceNames.AdviceCreateAdviceExternaPriorityMemberHigh & resources . resourcename . advicecreateadviceexternaprioritymemberroutine是资源文件中的常量,或者你可以说字符串,其值可以在不同的文化中可用。

如果你在MVC架构中实现你的web应用程序,那么创建一个属性

private IList result;
public IList Result
{
    get
    {
        result = typeof(Priority).GetStrings();
        return result;
    }
}

在你的.cshtml文件中,你可以像这样将枚举绑定到你的下拉列表:

@Html.DropDownListFor(model => Model.vwClinicalInfo.Priority, new SelectList(Model.Result))

谢谢 Ratnesh


更新:访问这个页面,8年后,在很长一段时间没有接触c#之后,看起来我的答案不再是最好的解决方案。我非常喜欢与属性-函数绑定的转换器解决方案。

如果你正在阅读这篇文章,请确保你也查看了其他答案。(提示:它们在这个上面)


和你们大多数人一样,我非常喜欢Jakub Šturc所选的答案,但我也非常讨厌复制粘贴代码,并尽可能少地这样做。

因此,我决定使用一个EnumBase类,从其中继承/内置大部分功能,从而使我能够专注于内容而不是行为。

这种方法的主要问题是基于这样一个事实,即尽管Enum值是类型安全的实例,但交互是与Enum Class类型的静态实现进行的。 所以在泛型魔法的帮助下,我想我终于得到了正确的组合。 希望有人能像我一样觉得这个有用。

我将从Jakub的例子开始,但是使用继承和泛型:

public sealed class AuthenticationMethod : EnumBase<AuthenticationMethod, int>
{
    public static readonly AuthenticationMethod FORMS =
        new AuthenticationMethod(1, "FORMS");
    public static readonly AuthenticationMethod WINDOWSAUTHENTICATION =
        new AuthenticationMethod(2, "WINDOWS");
    public static readonly AuthenticationMethod SINGLESIGNON =
        new AuthenticationMethod(3, "SSN");

    private AuthenticationMethod(int Value, String Name)
        : base( Value, Name ) { }
    public new static IEnumerable<AuthenticationMethod> All
    { get { return EnumBase<AuthenticationMethod, int>.All; } }
    public static explicit operator AuthenticationMethod(string str)
    { return Parse(str); }
}

这里是基类:

using System;
using System.Collections.Generic;
using System.Linq; // for the .AsEnumerable() method call

// E is the derived type-safe-enum class
// - this allows all static members to be truly unique to the specific
//   derived class
public class EnumBase<E, T> where E: EnumBase<E, T>
{
    #region Instance code
    public T Value { get; private set; }
    public string Name { get; private set; }

    protected EnumBase(T EnumValue, string Name)
    {
        Value = EnumValue;
        this.Name = Name;
        mapping.Add(Name, this);
    }

    public override string ToString() { return Name; }
    #endregion

    #region Static tools
    static private readonly Dictionary<string, EnumBase<E, T>> mapping;
    static EnumBase() { mapping = new Dictionary<string, EnumBase<E, T>>(); }
    protected static E Parse(string name)
    {
        EnumBase<E, T> result;
        if (mapping.TryGetValue(name, out result))
        {
            return (E)result;
        }

        throw new InvalidCastException();
    }
    // This is protected to force the child class to expose it's own static
    // method.
    // By recreating this static method at the derived class, static
    // initialization will be explicit, promising the mapping dictionary
    // will never be empty when this method is called.
    protected static IEnumerable<E> All
    { get { return mapping.Values.AsEnumerable().Cast<E>(); } }
    #endregion
}

我的变体

public struct Colors
{
    private String current;

    private static string red = "#ff0000";
    private static string green = "#00ff00";
    private static string blue = "#0000ff";

    private static IList<String> possibleColors; 

    public static Colors Red { get { return (Colors) red; } }
    public static Colors Green { get { return (Colors) green; } }
    public static Colors Blue { get { return (Colors) blue; } }

    static Colors()
    {
        possibleColors = new List<string>() {red, green, blue};
    }

    public static explicit operator String(Colors value)
    {
        return value.current;
    }

    public static explicit operator Colors(String value)
    {
        if (!possibleColors.Contains(value))
        {
            throw new InvalidCastException();
        }

        Colors color = new Colors();
        color.current = value;
        return color;
    }

    public static bool operator ==(Colors left, Colors right)
    {
        return left.current == right.current;
    }

    public static bool operator !=(Colors left, Colors right)
    {
        return left.current != right.current;
    }

    public bool Equals(Colors other)
    {
        return Equals(other.current, current);
    }

    public override bool Equals(object obj)
    {
        if (ReferenceEquals(null, obj)) return false;
        if (obj.GetType() != typeof(Colors)) return false;
        return Equals((Colors)obj);
    }

    public override int GetHashCode()
    {
        return (current != null ? current.GetHashCode() : 0);
    }

    public override string ToString()
    {
        return current;
    }
}

代码看起来有点丑,但是这个结构体的用法很有代表性。

Colors color1 = Colors.Red;
Console.WriteLine(color1); // #ff0000

Colors color2 = (Colors) "#00ff00";
Console.WriteLine(color2); // #00ff00

// Colors color3 = "#0000ff"; // Compilation error
// String color4 = Colors.Red; // Compilation error

Colors color5 = (Colors)"#ff0000";
Console.WriteLine(color1 == color5); // True

Colors color6 = (Colors)"#00ff00";
Console.WriteLine(color1 == color6); // False

此外,我认为,如果需要大量这样的枚举,可能会使用代码生成(例如T4)。


我使用一个扩展方法:

public static class AttributesHelperExtension
    {
        public static string ToDescription(this Enum value)
        {
            var da = (DescriptionAttribute[])(value.GetType().GetField(value.ToString())).GetCustomAttributes(typeof(DescriptionAttribute), false);
            return da.Length > 0 ? da[0].Description : value.ToString();
        }
}

现在用:

public enum AuthenticationMethod
{
    [Description("FORMS")]
    FORMS = 1,
    [Description("WINDOWSAUTHENTICATION")]
    WINDOWSAUTHENTICATION = 2,
    [Description("SINGLESIGNON ")]
    SINGLESIGNON = 3
}

当你打电话时

AuthenticationMethod.FORMS.ToDescription()将得到“FORMS”。


如果你来这里是为了实现一个简单的“Enum”,但其值是字符串而不是int,这里有一个最简单的解决方案:

    public sealed class MetricValueList
    {
        public static readonly string Brand = "A4082457-D467-E111-98DC-0026B9010912";
        public static readonly string Name = "B5B5E167-D467-E111-98DC-0026B9010912";
    }

实现:

var someStringVariable = MetricValueList.Brand;

我如何解决这个扩展方法:

using System.ComponentModel;
public static string GetDescription(this Enum value)
{
    var descriptionAttribute = (DescriptionAttribute)value.GetType()
        .GetField(value.ToString())
        .GetCustomAttributes(false)
        .Where(a => a is DescriptionAttribute)
        .FirstOrDefault();

    return descriptionAttribute != null ? descriptionAttribute.Description : value.ToString();
}

枚举:

public enum OrderType
{
    None = 0,
    [Description("New Card")]
    NewCard = 1,
    [Description("Reload")]
    Refill = 2
}

用法(其中o.OrderType是一个与enum同名的属性):

o.OrderType.GetDescription()

这给了我一个字符串的“新卡”或“重载”,而不是实际的enum值NewCard和重新填充。


我的答案是,正在处理@user29964的答案(这是迄今为止最简单和最接近Enum的答案)

 public class StringValue : System.Attribute
    {
        private string _value;

        public StringValue(string value)
        {
            _value = value;
        }

        public string Value
        {
            get { return _value; }
        }



        public static string GetStringValue(Enum Flagvalue)
        {
            Type type = Flagvalue.GetType();
            string[] flags = Flagvalue.ToString().Split(',').Select(x => x.Trim()).ToArray();
            List<string> values = new List<string>();

            for (int i = 0; i < flags.Length; i++)
            {

                FieldInfo fi = type.GetField(flags[i].ToString());

                StringValue[] attrs =
                   fi.GetCustomAttributes(typeof(StringValue),
                                           false) as StringValue[];
                if (attrs.Length > 0)
                {
                    values.Add(attrs[0].Value);
                }
            }
            return String.Join(",", values);

        }

使用

[Flags]
    public enum CompeteMetric
    {

        /// <summary>
        /// u
        /// </summary>
        [StringValue("u")]//Json mapping
        Basic_UniqueVisitors = 1 //Basic
             ,
        /// <summary>
        /// vi
        /// </summary>
        [StringValue("vi")]//json mapping
        Basic_Visits = 2// Basic
            ,
        /// <summary>
        /// rank
        /// </summary>
        [StringValue("rank")]//json mapping
        Basic_Rank = 4//Basic
 }

例子

        CompeteMetric metrics = CompeteMetric.Basic_Visits | CompeteMetric.Basic_Rank;
        string strmetrics = StringValue.GetStringValue(metrics);

它会返回 “vi,排名”


只需使用ToString()方法

public enum any{Tomato=0,Melon,Watermelon}

要引用字符串Tomato,只需使用

any.Tomato.ToString();

对我来说,实用的方法是类中类,sample:

public class MSEModel
{
    class WITS
    {
        public const string DATE = "5005";
        public const string TIME = "5006";
        public const string MD = "5008";
        public const string ROP = "5075";
        public const string WOB = "5073";
        public const string RPM = "7001";
... 
    }

好吧,在阅读了以上所有内容后,我觉得这些家伙将枚举数转换为字符串的问题过于复杂了。 我喜欢在枚举字段上拥有属性的想法,但我认为属性主要用于元数据,但在你的情况下,我认为你所需要的只是某种本地化。

public enum Color 
{ Red = 1, Green = 2, Blue = 3}


public static EnumUtils 
{
   public static string GetEnumResourceString(object enumValue)
    {
        Type enumType = enumValue.GetType();
        string value = Enum.GetName(enumValue.GetType(), enumValue);
        string resourceKey = String.Format("{0}_{1}", enumType.Name, value);
        string result = Resources.Enums.ResourceManager.GetString(resourceKey);
        if (string.IsNullOrEmpty(result))
        {
            result = String.Format("{0}", value);
        }
        return result;
    }
}

现在如果我们尝试调用上面的方法,我们可以这样调用它

public void Foo()
{
  var col = Color.Red;
  Console.WriteLine (EnumUtils.GetEnumResourceString (col));
}

您所需要做的就是创建一个包含所有枚举值和相应字符串的资源文件

Resource Name          Resource Value
Color_Red              My String Color in Red
Color_Blue             Blueeey
Color_Green            Hulk Color

这样做的好处是,如果您需要本地化应用程序,它将非常有用,因为您所需要做的只是用新语言创建另一个资源文件!和Voe-la !


这里还有另一种方法来完成将字符串与枚举关联的任务:

struct DATABASE {
    public enum enums {NOTCONNECTED, CONNECTED, ERROR}
    static List<string> strings =
        new List<string>() {"Not Connected", "Connected", "Error"};

    public string GetString(DATABASE.enums value) {
        return strings[(int)value];
    }
}

这个方法是这样调用的:

public FormMain() {
    DATABASE dbEnum;

    string enumName = dbEnum.GetString(DATABASE.enums.NOTCONNECTED);
}

您可以将相关枚举分组到它们自己的结构中。由于此方法使用枚举类型,所以在调用GetString()时可以使用智能感知来显示枚举列表。

可以选择在DATABASE结构上使用new操作符。不使用它意味着在第一次GetString()调用之前不会分配字符串列表。


我真的很喜欢Jakub Šturc的答案,但它的缺点是不能与开关case语句一起使用。下面是他的回答的一个稍微修改的版本,可以与switch语句一起使用:

public sealed class AuthenticationMethod
{
    #region This code never needs to change.
    private readonly string _name;
    public readonly Values Value;

    private AuthenticationMethod(Values value, String name){
        this._name = name;
        this.Value = value;
    }

    public override String ToString(){
        return _name;
    }
    #endregion

    public enum Values
    {
        Forms = 1,
        Windows = 2,
        SSN = 3
    }

    public static readonly AuthenticationMethod FORMS = new AuthenticationMethod (Values.Forms, "FORMS");
    public static readonly AuthenticationMethod WINDOWSAUTHENTICATION = new AuthenticationMethod (Values.Windows, "WINDOWS");
    public static readonly AuthenticationMethod SINGLESIGNON = new AuthenticationMethod (Values.SSN, "SSN");
}

所以你得到了Jakub Šturc的答案的所有好处,另外我们可以像这样使用switch语句:

var authenticationMethodVariable = AuthenticationMethod.FORMS;  // Set the "enum" value we want to use.
var methodName = authenticationMethodVariable.ToString();       // Get the user-friendly "name" of the "enum" value.

// Perform logic based on which "enum" value was chosen.
switch (authenticationMethodVariable.Value)
{
    case authenticationMethodVariable.Values.Forms: // Do something
        break;
    case authenticationMethodVariable.Values.Windows: // Do something
        break;
    case authenticationMethodVariable.Values.SSN: // Do something
        break;      
}

我支持Harvey,但不用const。我可以混合匹配字符串,int,等等。

public class xlsLayout
{
    public int xlHeaderRow = 1;
    public int xlFirstDataRow = 2;
    public int xlSkipLinesBetweenFiles = 1; //so 0 would mean don't skip
    public string xlFileColumn = "A";
    public string xlFieldColumn = "B";
    public string xlFreindlyNameColumn = "C";
    public string xlHelpTextColumn = "D";
}

然后……

public partial class Form1 : Form
{
    xlsLayout xlLayout = new xlsLayout();

    xl.SetCell(xlLayout.xlFileColumn, xlLayout.xlHeaderRow, "File Name");
    xl.SetCell(xlLayout.xlFieldColumn, xlLayout.xlHeaderRow, "Code field name");
    xl.SetCell(xlLayout.xlFreindlyNameColumn, xlLayout.xlHeaderRow, "Freindly name");
    xl.SetCell(xlLayout.xlHelpTextColumn, xlLayout.xlHeaderRow, "Inline Help Text");
}

当我遇到这样的情况时,我提出下面的解决方案。

作为一个消费阶级,你可以有

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MyApp.Dictionaries
{
    class Greek
    {

        public static readonly string Alpha = "Alpha";
        public static readonly string Beta = "Beta";
        public static readonly string Gamma = "Gamma";
        public static readonly string Delta = "Delta";


        private static readonly BiDictionary<int, string> Dictionary = new BiDictionary<int, string>();


        static Greek() {
            Dictionary.Add(1, Alpha);
            Dictionary.Add(2, Beta);
            Dictionary.Add(3, Gamma);
            Dictionary.Add(4, Delta);
        }

        public static string getById(int id){
            return Dictionary.GetByFirst(id);
        }

        public static int getByValue(string value)
        {
            return Dictionary.GetBySecond(value);
        }

    }
}

使用双向字典: 基于此(https://stackoverflow.com/a/255638/986160),假设键将与字典中的单个值相关联,类似于(https://stackoverflow.com/a/255630/986160),但更优雅一些。这个字典也是可枚举的,你可以在整型和字符串之间来回切换。此外,除了这个类,你的代码库中不需要有任何字符串。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace MyApp.Dictionaries
{

    class BiDictionary<TFirst, TSecond> : IEnumerable
    {
        IDictionary<TFirst, TSecond> firstToSecond = new Dictionary<TFirst, TSecond>();
        IDictionary<TSecond, TFirst> secondToFirst = new Dictionary<TSecond, TFirst>();

        public void Add(TFirst first, TSecond second)
        {
            firstToSecond.Add(first, second);
            secondToFirst.Add(second, first);
        }

        public TSecond this[TFirst first]
        {
            get { return GetByFirst(first); }
        }

        public TFirst this[TSecond second]
        {
            get { return GetBySecond(second); }
        }

        public TSecond GetByFirst(TFirst first)
        {
            return firstToSecond[first];
        }

        public TFirst GetBySecond(TSecond second)
        {
            return secondToFirst[second];
        }

        public IEnumerator GetEnumerator()
        {
            return GetFirstEnumerator();
        }

        public IEnumerator GetFirstEnumerator()
        {
            return firstToSecond.GetEnumerator();
        }

        public IEnumerator GetSecondEnumerator()
        {
            return secondToFirst.GetEnumerator();
        }
    }
}

这里有很多很棒的答案,但在我的情况下,并没有解决我想要的“字符串enum”,这是:

可用在switch语句中,例如switch(myEnum) 可以在函数参数中使用,例如foo(myEnum类型) 可以引用,例如myEnum。FirstElement 我可以使用字符串,例如foo("FirstElement") == foo(myenumer .FirstElement)

1、2和4实际上可以用一个字符串的c#类型定义来解决(因为字符串在c#中是可切换的)

3可以通过静态const字符串来求解。所以如果你有同样的需求,这是最简单的方法:

public sealed class Types
{

    private readonly String name;

    private Types(String name)
    {
        this.name = name;

    }

    public override String ToString()
    {
        return name;
    }

    public static implicit operator Types(string str)
    {
        return new Types(str);

    }
    public static implicit operator string(Types str)
    {
        return str.ToString();
    }


    #region enum

    public const string DataType = "Data";
    public const string ImageType = "Image";
    public const string Folder = "Folder";
    #endregion

}

这允许例如:

    public TypeArgs(Types SelectedType)
    {
        Types SelectedType = SelectedType
    }

and

public TypeObject CreateType(Types type)
    {
        switch (type)
        {

            case Types.ImageType:
              //
                break;

            case Types.DataType:
             //
                break;

        }
    }

CreateType可以用字符串或类型调用。然而,缺点是任何字符串都是自动有效的enum,这可以被修改,但它将需要某种init函数…或者可能使它们显式转换内部?

现在,如果一个int值对你来说很重要(也许是比较速度),你可以使用Jakub Šturc的一些想法,做一些疯狂的事情,这是我的尝试:

    public sealed class Types
{
    private static readonly Dictionary<string, Types> strInstance = new Dictionary<string, Types>();
    private static readonly Dictionary<int, Types> intInstance = new Dictionary<int, Types>();

    private readonly String name;
    private static int layerTypeCount = 0;
    private int value;
    private Types(String name)
    {
        this.name = name;
        value = layerTypeCount++;
        strInstance[name] = this;
        intInstance[value] = this;
    }

    public override String ToString()
    {
        return name;
    }


    public static implicit operator Types(int val)
    {
        Types result;
        if (intInstance.TryGetValue(val, out result))
            return result;
        else
            throw new InvalidCastException();
    }

    public static implicit operator Types(string str)
    {
        Types result;
        if (strInstance.TryGetValue(str, out result))
        {
            return result;
        }
        else
        {
            result = new Types(str);
            return result;
        }

    }
    public static implicit operator string(Types str)
    {
        return str.ToString();
    }

    public static bool operator ==(Types a, Types b)
    {
        return a.value == b.value;
    }
    public static bool operator !=(Types a, Types b)
    {
        return a.value != b.value;
    }

    #region enum

    public const string DataType = "Data";
    public const string ImageType = "Image";

    #endregion

}

但是当然"Types bob = 4;"是没有意义的,除非你先对它们进行初始化,这就有点失败了……

但理论上a型== b型会更快…


在你的问题中,你从未说过你实际上需要枚举的数值。

如果你不这样做,只是需要一个string类型的枚举(这不是一个整型,所以不能是enum的基)这里有一个方法:

    static class AuthenticationMethod
    {
        public static readonly string
            FORMS = "Forms",
            WINDOWSAUTHENTICATION = "WindowsAuthentication";
    }

您可以使用与enum相同的语法来引用它

if (bla == AuthenticationMethod.FORMS)

它将比使用数值(比较字符串而不是数字)稍微慢一些,但从好的方面来看,它不使用反射(慢)来访问字符串。


用. net 4.0及以上版本解决这个问题非常简单。不需要其他代码。

public enum MyStatus
{
    Active = 1,
    Archived = 2
}

获取字符串about只需使用:

MyStatus.Active.ToString("f");

or

MyStatus.Archived.ToString("f");`

取值为Active或Archived。

当调用Enum时,查看不同的字符串格式(上面的“f”)。ToString参见此枚举格式字符串页面


如果我理解正确,你可以简单地使用.ToString()从值中检索enum的名称(假设它已经被转换为enum); 如果你有裸整型(比如从数据库或其他地方),你可以先将它强制转换为枚举。 下面的两个方法都将获得枚举名称。

AuthenticationMethod myCurrentSetting = AuthenticationMethod.FORMS;
Console.WriteLine(myCurrentSetting); // Prints: FORMS
string name = Enum.GetNames(typeof(AuthenticationMethod))[(int)myCurrentSetting-1];
Console.WriteLine(name); // Prints: FORMS

但是请记住,第二种技术假设您使用的是int型,并且您的索引基于1(而不是基于0)。相比之下,GetNames函数也相当繁重,每次调用它都要生成一个完整的数组。 正如您在第一种技术中看到的,. tostring()实际上是隐式调用的。 这两个问题都已经在答案中提到了,当然,我只是想澄清它们之间的区别。


老帖子,但是…

这个问题的答案其实很简单。使用enumel . tostring()函数

这个函数有6个重载,你可以使用enumenumtostring ("F")或enumenumtostring()来返回字符串值。没必要为其他事操心。这是一个正在运行的演示

注意,这个解决方案可能不适用于所有编译器(这个演示没有像预期的那样工作),但至少它适用于最新的编译器。


我很清楚这个问题已经被回答了,而且OP已经对接受的答案感到满意。但我发现大多数答案,包括公认的答案,都有点复杂。

我有一个项目给了我这样的情况,我能够以这种方式实现它。

首先,你必须考虑枚举名称的大小写:

public enum AuthenticationMethod
{
    Forms = 1,
    WindowsAuthentication = 2,
    SingleSignOn = 3
}

然后,有这个扩展:

using System.Text.RegularExpression;

public static class AnExtension
{
    public static string Name(this Enum value)
    {
        string strVal = value.ToString();
        try
        {
            return Regex.Replace(strVal, "([a-z])([A-Z])", "$1 $2");
        }
        catch
        {
        }
        return strVal;
    }
}

通过这种方法,您可以将每个枚举名称转换为字符串表示形式,每个单词用空格分隔。例:

AuthenticationMethod am = AuthenticationMethod.WindowsAuthentication;
MessageBox.Show(am.Name());

对于较大的字符串enum集,列出的示例可能会变得令人厌烦。如果您想要一个状态代码列表,或者其他基于字符串的枚举列表,那么属性系统使用起来很麻烦,而带有自身实例的静态类配置起来也很麻烦。对于我自己的解决方案,我使用了T4模板,以便更容易地使用字符串支持的枚举。结果与HttpMethod类的工作方式类似。

你可以这样使用它:

    string statusCode = ResponseStatusCode.SUCCESS; // Automatically converts to string when needed
    ResponseStatusCode codeByValueOf = ResponseStatusCode.ValueOf(statusCode); // Returns null if not found

    // Implements TypeConverter so you can use it with string conversion methods.
    var converter = System.ComponentModel.TypeDescriptor.GetConverter(typeof(ResponseStatusCode));
    ResponseStatusCode code = (ResponseStatusCode) converter.ConvertFromInvariantString(statusCode);

    // You can get a full list of the values
    bool canIterateOverValues = ResponseStatusCode.Values.Any(); 

    // Comparisons are by value of the "Name" property. Not by memory pointer location.
    bool implementsByValueEqualsEqualsOperator = "SUCCESS" == ResponseStatusCode.SUCCESS; 

你从Enum开始。tt文件。

<#@ include file="StringEnum.ttinclude" #>


<#+
public static class Configuration
{
    public static readonly string Namespace = "YourName.Space";
    public static readonly string EnumName = "ResponseStatusCode";
    public static readonly bool IncludeComments = true;

    public static readonly object Nodes = new
    {
        SUCCESS = "The response was successful.",
        NON_SUCCESS = "The request was not successful.",
        RESOURCE_IS_DISCONTINUED = "The resource requested has been discontinued and can no longer be accessed."
    };
}
#>

然后,添加StringEnum。ttinclude文件。

<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Text" #>
<#@ import namespace="System.Reflection" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ output extension=".cs" #>
<#@ CleanupBehavior processor="T4VSHost" CleanupAfterProcessingtemplate="true" #>

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

using System;
using System.Linq;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;

namespace <#= Configuration.Namespace #>
{
    /// <summary>
    /// TypeConverter implementations allow you to use features like string.ToNullable(T).
    /// </summary>
    public class <#= Configuration.EnumName #>TypeConverter : TypeConverter
    {
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            return sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);
        }

        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        {
            var casted = value as string;

            if (casted != null)
            {
                var result = <#= Configuration.EnumName #>.ValueOf(casted);
                if (result != null)
                {
                    return result;
                }
            }

            return base.ConvertFrom(context, culture, value);
        }

        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        {
            var casted = value as <#= Configuration.EnumName #>;
            if (casted != null && destinationType == typeof(string))
            {
                return casted.ToString();
            }

            return base.ConvertTo(context, culture, value, destinationType);
        }
    }

    [TypeConverter(typeof(<#= Configuration.EnumName #>TypeConverter))]
    public class <#= Configuration.EnumName #> : IEquatable<<#= Configuration.EnumName #>>
    {
//---------------------------------------------------------------------------------------------------
// V A L U E S _ L I S T
//---------------------------------------------------------------------------------------------------
<# Write(Helpers.PrintEnumProperties(Configuration.Nodes)); #>

        private static List<<#= Configuration.EnumName #>> _list { get; set; } = null;
        public static List<<#= Configuration.EnumName #>> ToList()
        {
            if (_list == null)
            {
                _list = typeof(<#= Configuration.EnumName #>).GetFields().Where(x => x.IsStatic && x.IsPublic && x.FieldType == typeof(<#= Configuration.EnumName #>))
                    .Select(x => x.GetValue(null)).OfType<<#= Configuration.EnumName #>>().ToList();
            }

            return _list;
        }

        public static List<<#= Configuration.EnumName #>> Values()
        {
            return ToList();
        }

        /// <summary>
        /// Returns the enum value based on the matching Name of the enum. Case-insensitive search.
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static <#= Configuration.EnumName #> ValueOf(string key)
        {
            return ToList().FirstOrDefault(x => string.Compare(x.Name, key, true) == 0);
        }


//---------------------------------------------------------------------------------------------------
// I N S T A N C E _ D E F I N I T I O N
//---------------------------------------------------------------------------------------------------      
        public string Name { get; private set; }
        public string Description { get; private set; }
        public override string ToString() { return this.Name; }

        /// <summary>
        /// Implcitly converts to string.
        /// </summary>
        /// <param name="d"></param>
        public static implicit operator string(<#= Configuration.EnumName #> d)
        {
            return d.ToString();
        }

        /// <summary>
        /// Compares based on the == method. Handles nulls gracefully.
        /// </summary>
        /// <param name="a"></param>
        /// <param name="b"></param>
        /// <returns></returns>
        public static bool operator !=(<#= Configuration.EnumName #> a, <#= Configuration.EnumName #> b)
        {
            return !(a == b);
        }

        /// <summary>
        /// Compares based on the .Equals method. Handles nulls gracefully.
        /// </summary>
        /// <param name="a"></param>
        /// <param name="b"></param>
        /// <returns></returns>
        public static bool operator ==(<#= Configuration.EnumName #> a, <#= Configuration.EnumName #> b)
        {
            return a?.ToString() == b?.ToString();
        }

        /// <summary>
        /// Compares based on the .ToString() method
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public override bool Equals(object o)
        {
            return this.ToString() == o?.ToString();
        }

        /// <summary>
        /// Compares based on the .ToString() method
        /// </summary>
        /// <param name="other"></param>
        /// <returns></returns>
        public bool Equals(<#= Configuration.EnumName #> other)
        {
            return this.ToString() == other?.ToString();
        }

        /// <summary>
        /// Compares based on the .Name property
        /// </summary>
        /// <returns></returns>
        public override int GetHashCode()
        {
            return this.Name.GetHashCode();
        }
    }
}

<#+

public static class Helpers
{
        public static string PrintEnumProperties(object nodes)
        {
            string o = "";
            Type nodesTp = Configuration.Nodes.GetType();
            PropertyInfo[] props = nodesTp.GetProperties().OrderBy(p => p.Name).ToArray();

            for(int i = 0; i < props.Length; i++)
            {
                var prop = props[i];
                if (Configuration.IncludeComments)
                {
                    o += "\r\n\r\n";
                    o += "\r\n        ///<summary>";
                    o += "\r\n        /// "+Helpers.PrintPropertyValue(prop, Configuration.Nodes);
                    o += "\r\n        ///</summary>";
                }

                o += "\r\n        public static readonly "+Configuration.EnumName+" "+prop.Name+ " = new "+Configuration.EnumName+"(){ Name = \""+prop.Name+"\", Description = "+Helpers.PrintPropertyValue(prop, Configuration.Nodes)+ "};";
            }

            o += "\r\n\r\n";

            return o;
        }

        private static Dictionary<string, string> GetValuesMap()
        {
            Type nodesTp = Configuration.Nodes.GetType();
            PropertyInfo[] props= nodesTp.GetProperties();
            var dic = new Dictionary<string,string>();
            for(int i = 0; i < props.Length; i++)
            {
                var prop = nodesTp.GetProperties()[i];
                dic[prop.Name] = prop.GetValue(Configuration.Nodes).ToString();
            }
            return dic;
        }

        public static string PrintMasterValuesMap(object nodes)
        {
            Type nodesTp = Configuration.Nodes.GetType();
            PropertyInfo[] props= nodesTp.GetProperties();
            string o = "        private static readonly Dictionary<string, string> ValuesMap = new Dictionary<string, string>()\r\n        {";
            for(int i = 0; i < props.Length; i++)
            {
                var prop = nodesTp.GetProperties()[i];
                o += "\r\n            { \""+prop.Name+"\", "+(Helpers.PrintPropertyValue(prop,Configuration.Nodes)+" },");
            }
            o += ("\r\n        };\r\n");

            return o;
        }


        public static string PrintPropertyValue(PropertyInfo prop, object objInstance)
        {
            switch(prop.PropertyType.ToString()){
                case "System.Double":
                    return prop.GetValue(objInstance).ToString()+"D";
                case "System.Float":
                    return prop.GetValue(objInstance).ToString()+"F";
                case "System.Decimal":
                    return prop.GetValue(objInstance).ToString()+"M";
                case "System.Long":
                    return prop.GetValue(objInstance).ToString()+"L";
                case "System.Boolean":
                case "System.Int16":
                case "System.Int32":
                    return prop.GetValue(objInstance).ToString().ToLowerInvariant();
                case "System.String":
                    return "\""+prop.GetValue(objInstance)+"\"";
            }

            return prop.GetValue(objInstance).ToString();
        }

        public static string _ (int numSpaces)
        {
            string o = "";
            for(int i = 0; i < numSpaces; i++){
                o += " ";
            }

            return o;
        }
}
#>

最后,重新编译Enum。Tt文件,输出如下所示:

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

using System;
using System.Linq;
using System.Collections.Generic;

namespace YourName.Space
{
    public class ResponseStatusCode
    {
//---------------------------------------------------------------------------------------------------
// V A L U E S _ L I S T 
//---------------------------------------------------------------------------------------------------



        ///<summary>
        /// "The response was successful."
        ///</summary>
        public static readonly ResponseStatusCode SUCCESS = new ResponseStatusCode(){ Name = "SUCCESS", Description = "The response was successful."};


        ///<summary>
        /// "The request was not successful."
        ///</summary>
        public static readonly ResponseStatusCode NON_SUCCESS = new ResponseStatusCode(){ Name = "NON_SUCCESS", Description = "The request was not successful."};


        ///<summary>
        /// "The resource requested has been discontinued and can no longer be accessed."
        ///</summary>
        public static readonly ResponseStatusCode RESOURCE_IS_DISCONTINUED = new ResponseStatusCode(){ Name = "RESOURCE_IS_DISCONTINUED", Description = "The resource requested has been discontinued and can no longer be accessed."};


        private static List<ResponseStatusCode> _list { get; set; } = null;
        public static List<ResponseStatusCode> ToList()
        {
            if (_list == null)
            {
                _list = typeof(ResponseStatusCode).GetFields().Where(x => x.IsStatic && x.IsPublic && x.FieldType == typeof(ResponseStatusCode))
                    .Select(x => x.GetValue(null)).OfType<ResponseStatusCode>().ToList();
            }

            return _list;
        }

        public static List<ResponseStatusCode> Values()
        {
            return ToList();
        }

        /// <summary>
        /// Returns the enum value based on the matching Name of the enum. Case-insensitive search.
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static ResponseStatusCode ValueOf(string key)
        {
            return ToList().FirstOrDefault(x => string.Compare(x.Name, key, true) == 0);
        }


//---------------------------------------------------------------------------------------------------
// I N S T A N C E _ D E F I N I T I O N 
//---------------------------------------------------------------------------------------------------       
        public string Name { get; set; }
        public string Description { get; set; }
        public override string ToString() { return this.Name; }

        /// <summary>
        /// Implcitly converts to string.
        /// </summary>
        /// <param name="d"></param>
        public static implicit operator string(ResponseStatusCode d)
        {
            return d.ToString();
        }

        /// <summary>
        /// Compares based on the == method. Handles nulls gracefully.
        /// </summary>
        /// <param name="a"></param>
        /// <param name="b"></param>
        /// <returns></returns>
        public static bool operator !=(ResponseStatusCode a, ResponseStatusCode b)
        {
            return !(a == b);
        }

        /// <summary>
        /// Compares based on the .Equals method. Handles nulls gracefully.
        /// </summary>
        /// <param name="a"></param>
        /// <param name="b"></param>
        /// <returns></returns>
        public static bool operator ==(ResponseStatusCode a, ResponseStatusCode b)
        {
            return a?.ToString() == b?.ToString();
        }

        /// <summary>
        /// Compares based on the .ToString() method
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public override bool Equals(object o)
        {
            return this.ToString() == o?.ToString();
        }

        /// <summary>
        /// Compares based on the .Name property
        /// </summary>
        /// <returns></returns>
        public override int GetHashCode()
        {
            return this.Name.GetHashCode();
        }
    }
}

Enum.GetName(typeof(MyEnum), (int)MyEnum.FORMS)
Enum.GetName(typeof(MyEnum), (int)MyEnum.WINDOWSAUTHENTICATION)
Enum.GetName(typeof(MyEnum), (int)MyEnum.SINGLESIGNON)

输出是:

“形式”

“WINDOWSAUTHENTICATION”

“SINGLESIGNON”


您可以声明enum和字典,其中键将是枚举的值。以后,您可以参考字典来获取该值。因此,可以将形参作为枚举类型传递给函数,但要从字典中获取实际值:

using System;
using System.Collections.Generic;

namespace console_test
{
    class Program
    {
        #region SaveFormat
        internal enum SaveFormat
        {
            DOCX,
            PDF
        }

        internal static Dictionary<SaveFormat,string> DictSaveFormat = new Dictionary<SaveFormat, string>
        {
            { SaveFormat.DOCX,"This is value for DOCX enum item" },
            { SaveFormat.PDF,"This is value for PDF enum item" }
        };

        internal static void enum_value_test(SaveFormat save_format)
        {
            Console.WriteLine(DictSaveFormat[save_format]);
        }
        #endregion

        internal static void Main(string[] args)
        {
            enum_value_test(SaveFormat.DOCX);//Output: This is value for DOCX enum item
            Console.Write("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
    }
}

我创建了一个基类,用于在. net中创建字符串值的枚举。它只是一个c#文件,你可以复制粘贴到你的项目中,或者通过名为StringEnum的NuGet包安装。GitHub回购

如果类被注释为xml comment <completitionlist>,智能感知将提示枚举名称。(适用于c#和VB)

类似于普通enum的用法:

///<completionlist cref="HexColor"/> 
class HexColor : StringEnum<HexColor>
{
    public static readonly HexColor Blue = Create("#FF0000");
    public static readonly HexColor Green = Create("#00FF00");
    public static readonly HexColor Red = Create("#000FF");
}
    // Static Parse Method
    HexColor.Parse("#FF0000") // => HexColor.Red
    HexColor.Parse("#ff0000", caseSensitive: false) // => HexColor.Red
    HexColor.Parse("invalid") // => throws InvalidOperationException

    // Static TryParse method.
    HexColor.TryParse("#FF0000") // => HexColor.Red
    HexColor.TryParse("#ff0000", caseSensitive: false) // => HexColor.Red
    HexColor.TryParse("invalid") // => null

    // Parse and TryParse returns the preexistent instances
    object.ReferenceEquals(HexColor.Parse("#FF0000"), HexColor.Red) // => true

    // Conversion from your `StringEnum` to `string`
    string myString1 = HexColor.Red.ToString(); // => "#FF0000"
    string myString2 = HexColor.Red; // => "#FF0000" (implicit cast)

Instalation:

将下面的StringEnum基类粘贴到项目中。(最新版本) 或者安装StringEnum NuGet包,它基于。net Standard 1.0,所以它可以运行在。net Core >= 1.0, . net Framework >= 4.5, Mono >= 4.6等等。

    /// <summary>
    /// Base class for creating string-valued enums in .NET.<br/>
    /// Provides static Parse() and TryParse() methods and implicit cast to string.
    /// </summary>
    /// <example> 
    /// <code>
    /// class Color : StringEnum &lt;Color&gt;
    /// {
    ///     public static readonly Color Blue = Create("Blue");
    ///     public static readonly Color Red = Create("Red");
    ///     public static readonly Color Green = Create("Green");
    /// }
    /// </code>
    /// </example>
    /// <typeparam name="T">The string-valued enum type. (i.e. class Color : StringEnum&lt;Color&gt;)</typeparam>
    public abstract class StringEnum<T> : IEquatable<T> where T : StringEnum<T>, new()
    {
        protected string Value;
        private static Dictionary<string, T> valueDict = new Dictionary<string, T>();
        protected static T Create(string value)
        {
            if (value == null)
                return null; // the null-valued instance is null.

            var result = new T() { Value = value };
            valueDict.Add(value, result);
            return result;
        }

        public static implicit operator string(StringEnum<T> enumValue) => enumValue.Value;
        public override string ToString() => Value;

        public static bool operator !=(StringEnum<T> o1, StringEnum<T> o2) => o1?.Value != o2?.Value;
        public static bool operator ==(StringEnum<T> o1, StringEnum<T> o2) => o1?.Value == o2?.Value;

        public override bool Equals(object other) => this.Value.Equals((other as T)?.Value ?? (other as string));
        bool IEquatable<T>.Equals(T other) => this.Value.Equals(other.Value);
        public override int GetHashCode() => Value.GetHashCode();

        /// <summary>
        /// Parse the <paramref name="value"/> specified and returns a valid <typeparamref name="T"/> or else throws InvalidOperationException.
        /// </summary>
        /// <param name="value">The string value representad by an instance of <typeparamref name="T"/>. Matches by string value, not by the member name.</param>
        /// <param name="caseSensitive">If true, the strings must match case and takes O(log n). False allows different case but is little bit slower (O(n))</param>
        public static T Parse(string value, bool caseSensitive = true)
        {
            var result = TryParse(value, caseSensitive);
            if (result == null)
                throw new InvalidOperationException((value == null ? "null" : $"'{value}'") + $" is not a valid {typeof(T).Name}");

            return result;
        }

        /// <summary>
        /// Parse the <paramref name="value"/> specified and returns a valid <typeparamref name="T"/> or else returns null.
        /// </summary>
        /// <param name="value">The string value representad by an instance of <typeparamref name="T"/>. Matches by string value, not by the member name.</param>
        /// <param name="caseSensitive">If true, the strings must match case. False allows different case but is slower: O(n)</param>
        public static T TryParse(string value, bool caseSensitive = true)
        {
            if (value == null) return null;
            if (valueDict.Count == 0) System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor(typeof(T).TypeHandle); // force static fields initialization
            if (caseSensitive)
            {
                if (valueDict.TryGetValue(value, out T item))
                    return item;
                else
                    return null;
            }
            else
            {
                // slower O(n) case insensitive search
                return valueDict.FirstOrDefault(f => f.Key.Equals(value, StringComparison.OrdinalIgnoreCase)).Value;
                // Why Ordinal? => https://esmithy.net/2007/10/15/why-stringcomparisonordinal-is-usually-the-right-choice/
            }
        }
    }