c# - 客户枚举类型和系统枚举类型之间有什么区别吗

Question

我做了如下测试↓

1) 创建一个客户枚举(从星期几复制)

[Serializable]
public enum Tester
{
    // 概要:
    //     Indicates Sunday.
    Sunday = 0,
    //
    // 概要:
    //     Indicates Monday.
    Monday = 1,
    //
    // 概要:
    //     Indicates Tuesday.
    Tuesday = 2,
    //
    // 概要:
    //     Indicates Wednesday.
    Wednesday = 3,
    //
    // 概要:
    //     Indicates Thursday.
    Thursday = 4,
    //
    // 概要:
    //     Indicates Friday.
    Friday = 5,
    //
    // 概要:
    //     Indicates Saturday.
    Saturday = 6,
}

2) 创建两个测试方法...

    static void TestEnumToString()
    {
        var t = Tester.Sunday;
        Enumerable.Range(0, 1000000).ToList().ForEach(i => t.ToString());
    }

    static void DayOfWeekEnumToString()
    {
        var t = DayOfWeek.Sunday;
        Enumerable.Range(0, 1000000).ToList().ForEach(i => t.ToString());
    }

3)主要方法

    static void Main()
    {
        Stopwatch sw = new Stopwatch();
        sw.Start();
        TestEnumToString();
        sw.Stop();
        Console.WriteLine("Tester:" + sw.ElapsedMilliseconds);


        sw = new Stopwatch();
        sw.Start();
        DayOfWeekEnumToString();
        sw.Stop();
        Console.WriteLine("DayOfWeek:" + sw.ElapsedMilliseconds);

        Console.ReadKey();
    }

4) 结果:

Tester : 3164ms
DayOfWeek : 7032ms

我真的不知道为什么系统类型枚举比客户枚举类型慢....谁能告诉我为什么？谢谢...

更新编辑:将 [ComVisible(true)] 添加到枚举中。

[ComVisible(true)]
[Serializable]
public enum Tester
{
    Sunday = 0,


    Monday = 1,


    Tuesday = 2,


    Wednesday = 3,


    Thursday = 4,


    Friday = 5,


    Saturday = 6,
}

结果:

Tester : 5018ms
DayOfWeek : 7032ms

系统枚举类型仍然比客户枚举类型慢...

Answer 1

枚举可以用 [ComVisible(true)] 或 [Flags] 装饰，每次它都会改变你的测试结果。

[Serializable]
//[Flags]
[ComVisible(true)]
public enum Tester
{    
  // 概要:
  //     Indicates Sunday.
  Sunday = 0,