为什么具有相同哈希代码的这些操作具有不同的调用列表?

代码示例讲述了这个问题的故事。 Here it is as a Fiddle .

我希望这些操作的行为类似于“普通”引用类型实例 such as List<Action> .

using System;

public class Program
{
    static Action action1;
    static Action action2;
    public static void Main()
    {
        // the Both method goes to both action1 and action2
        // that is what I expected
        action1 = Both;
        action2 = action1;

        // anything now assigned to action1 only goes to action1
        action1 += OnlyAction1;

        // and anything now assigned to action2 only goes to action2
        action2 += OnlyAction2;

        foreach (var d in action1.GetInvocationList())
            Console.WriteLine(d.Method.Name);

        foreach (var d in action2.GetInvocationList())
            Console.WriteLine(d.Method.Name);

        // since both actions have the same HashCode, 
        // I expected both actions to have the same invocation list, 
        Console.WriteLine(action1.GetHashCode());
        Console.WriteLine(action2.GetHashCode());
    }

    public static void Both() {}
    public static void OnlyAction1() {}
    public static void OnlyAction2() { }
}

输出:

Both
OnlyAction1
Both
OnlyAction2
828401262
828401262