我有一门课叫问题(复数)。在这个类中有一个名为Question(单数)的枚举,看起来像这样。

public enum Question
{
    Role = 2,
    ProjectFunding = 3,
    TotalEmployee = 4,
    NumberOfServers = 5,
    TopBusinessConcern = 6
}

在Questions类中,我有一个get(intfoo)函数,它为该foo返回Questions对象。有没有一种简单的方法可以从枚举中获取整数值,这样我就可以执行类似于Questions.get(Questions.Role)的操作?


当前回答

Use:

Question question = Question.Role;
int value = question.GetHashCode();

这将导致值==2。

只有当枚举适合于int时,这才是真的。

其他回答

还有一种方法:

Console.WriteLine("Name: {0}, Value: {0:D}", Question.Role);

这将导致:

Name: Role, Value: 2

尝试使用此方法,而不是将enum转换为int:

public static class ReturnType
{
    public static readonly int Success = 1;
    public static readonly int Duplicate = 2;
    public static readonly int Error = -1;        
}

为了确保枚举值存在,然后解析它,还可以执行以下操作。

// Fake Day of Week
string strDOWFake = "SuperDay";

// Real Day of Week
string strDOWReal = "Friday";

// Will hold which ever is the real DOW.
DayOfWeek enmDOW;

// See if fake DOW is defined in the DayOfWeek enumeration.
if (Enum.IsDefined(typeof(DayOfWeek), strDOWFake))
{
    // This will never be reached since "SuperDay"
    // doesn't exist in the DayOfWeek enumeration.
    enmDOW = (DayOfWeek)Enum.Parse(typeof(DayOfWeek), strDOWFake);
}
// See if real DOW is defined in the DayOfWeek enumeration.
else if (Enum.IsDefined(typeof(DayOfWeek), strDOWReal))
{
    // This will parse the string into it's corresponding DOW enum object.
    enmDOW = (DayOfWeek)Enum.Parse(typeof(DayOfWeek), strDOWReal);
}

// Can now use the DOW enum object.
Console.Write("Today is " + enmDOW.ToString() + ".");

以下是扩展方法

public static string ToEnumString<TEnum>(this int enumValue)
{
    var enumString = enumValue.ToString();
    if (Enum.IsDefined(typeof(TEnum), enumValue))
    {
        enumString = ((TEnum) Enum.ToObject(typeof (TEnum), enumValue)).ToString();
    }
    return enumString;
}
public enum ViewType
{
    List = 1,
    Table = 2,
};
            
// You can use the Enum type as a parameter, so any enumeration from any enumerator 
// cshtml
// using proyects.Helpers
// @if (Model.ViewType== (int)<variable>.List )