如何在C#中将函数作为参数传递？

using System;

public class Program
{
    public delegate void MyDelegate(string message);

    public static void MyMethod(string message)
    {
        Console.WriteLine("MyMethod: " + message);
    }

    public static void CallMethod(MyDelegate del, string message)
    {
        del(message);
    }

    public static void Main(string[] args)
    {
        MyDelegate myDel = new MyDelegate(MyMethod);
        CallMethod(myDel, "Hello, World!");
    }
}

using System;

public class Program
{
    public static void MyMethod(string message)
    {
        Console.WriteLine("MyMethod: " + message);
    }

    public static void CallMethod(Action<string> action, string message)
    {
        action(message);
    }

    public static void Main(string[] args)
    {
        CallMethod(MyMethod, "Hello, World!");
    }
}