C# 委托实例实现的多种类型

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication17
{
    public delegate string testDelegate(string a, int b);
    class Program
    {
        static void Main(string[] args)
        {
            //1 C# 1 最原始的委托赋值
            testDelegate t1 = new testDelegate(M);

            //2 C# 2 委托赋值
            testDelegate t2 = delegate (string a, int b)
            {
                Console.WriteLine(a + b.ToString());
                return a + b.ToString();
            };

            //3 C# 3 委托赋值（a，b值类型对应委托声明的类型）
            testDelegate t3 = (a, b) =>
            {
                Console.WriteLine(a + b.ToString());
                return a + b.ToString();
            };
            // 调用委托实例
            t1.Invoke("测试1", );
            t2.Invoke("测试2", );
            t3.Invoke("测试3", );
        }
        static string M(string a, int b)
        {
            Console.WriteLine(a + b.ToString());
            return a + b.ToString();
        }
    }
}