如果您有：

enum Suit
{
   Spades,
   Hearts,
   Clubs,
   Diamonds
}

这：

foreach (var e in Enum.GetValues(typeof(Suit)))
{
    Console.WriteLine(e.ToString() + " = " + (int)e);
}

将输出：

Spades = 0
Hearts = 1
Clubs = 2
Diamonds = 3

将方法public static IEnumerable＜T＞GetValues＜T＞（）添加到类中，如：

public static IEnumerable<T> GetValues<T>()
{
    return Enum.GetValues(typeof(T)).Cast<T>();
}

调用并传递枚举。现在您可以使用foreach遍历它：

 public static void EnumerateAllSuitsDemoMethod()
 {
     // Custom method
     var foos = GetValues<Suit>();
     foreach (var foo in foos)
     {
         // Do something
     }
 }

我做了一些扩展以方便枚举的使用。也许有人可以使用它。。。

public static class EnumExtensions
{
    /// <summary>
    /// Gets all items for an enum value.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="value">The value.</param>
    /// <returns></returns>
    public static IEnumerable<T> GetAllItems<T>(this Enum value)
    {
        foreach (object item in Enum.GetValues(typeof(T)))
        {
            yield return (T)item;
        }
    }

    /// <summary>
    /// Gets all items for an enum type.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="value">The value.</param>
    /// <returns></returns>
    public static IEnumerable<T> GetAllItems<T>() where T : struct
    {
        foreach (object item in Enum.GetValues(typeof(T)))
        {
            yield return (T)item;
        }
    }

    /// <summary>
    /// Gets all combined items from an enum value.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="value">The value.</param>
    /// <returns></returns>
    /// <example>
    /// Displays ValueA and ValueB.
    /// <code>
    /// EnumExample dummy = EnumExample.Combi;
    /// foreach (var item in dummy.GetAllSelectedItems<EnumExample>())
    /// {
    ///    Console.WriteLine(item);
    /// }
    /// </code>
    /// </example>
    public static IEnumerable<T> GetAllSelectedItems<T>(this Enum value)
    {
        int valueAsInt = Convert.ToInt32(value, CultureInfo.InvariantCulture);

        foreach (object item in Enum.GetValues(typeof(T)))
        {
            int itemAsInt = Convert.ToInt32(item, CultureInfo.InvariantCulture);

            if (itemAsInt == (valueAsInt & itemAsInt))
            {
                yield return (T)item;
            }
        }
    }

    /// <summary>
    /// Determines whether the enum value contains a specific value.
    /// </summary>
    /// <param name="value">The value.</param>
    /// <param name="request">The request.</param>
    /// <returns>
    ///     <c>true</c> if value contains the specified value; otherwise, <c>false</c>.
    /// </returns>
    /// <example>
    /// <code>
    /// EnumExample dummy = EnumExample.Combi;
    /// if (dummy.Contains<EnumExample>(EnumExample.ValueA))
    /// {
    ///     Console.WriteLine("dummy contains EnumExample.ValueA");
    /// }
    /// </code>
    /// </example>
    public static bool Contains<T>(this Enum value, T request)
    {
        int valueAsInt = Convert.ToInt32(value, CultureInfo.InvariantCulture);
        int requestAsInt = Convert.ToInt32(request, CultureInfo.InvariantCulture);

        if (requestAsInt == (valueAsInt & requestAsInt))
        {
            return true;
        }

        return false;
    }
}

枚举本身必须用FlagsAttribute修饰：

[Flags]
public enum EnumExample
{
    ValueA = 1,
    ValueB = 2,
    ValueC = 4,
    ValueD = 8,
    Combi = ValueA | ValueB
}

简单的Enum.GetNames（EnumType）应该可以工作

通过组合最重要的答案，我总结了一个非常简单的扩展：

public static class EnumExtensions
{
    /// <summary>
    /// Gets all items for an enum value.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="value">The value.</param>
    /// <returns></returns>
    public static IEnumerable<T> GetAllItems<T>(this T value) where T : Enum
    {
        return (T[])Enum.GetValues(typeof (T));
    }
}

它干净、简单，而且，根据@Jeppe Stig Nielsen的评论，速度很快。

某些版本的.NET框架不支持Enum.GetValues。以下是Ideas 2.0的一个很好的解决方法：Compact framework中的Enum.Get Values：

public Enum[] GetValues(Enum enumeration)
{
    FieldInfo[] fields = enumeration.GetType().GetFields(BindingFlags.Static | BindingFlags.Public);
    Enum[] enumerations = new Enum[fields.Length];

    for (var i = 0; i < fields.Length; i++)
        enumerations[i] = (Enum) fields[i].GetValue(enumeration);

    return enumerations;
}

与任何涉及反射的代码一样，您应该采取措施确保它只运行一次并缓存结果。