c#Func委托

public delegate TResult Func<in T, out TResult>(T arg);

参数类型

T：此委托方法的参数类型

TResult：此委托方法的返回值类型

arg：此委托封装方法的参数

using System;

namespace 编码练习
{
    //将名字大小写转换
    class Program
    {
        public static string UppercaseString(string name)
        {
            return name.ToUpper();
        }
        public static void Main()
        {
            Func<string, string> translation = UppercaseString;
            string name = "make";
            Console.WriteLine(translation(name));

        }
    }
}

using System;

namespace 编码练习
{
    //将名字大小写转换
    class Program
    {
       //使用匿名方法
        public static void Main()
        {
            Func<string, string> translation = delegate (string s) { return s.ToUpper(); };
            string name = "make";
            Console.WriteLine(translation(name));

        }
    }
}

using System;

namespace 编码练习
{
    //将名字大小写转换
    class Program
    {
       //使用lambda表达式
        public static void Main()
        {
            Func<string, string> translation = x => x.ToUpper();
            string name = "make";
            Console.WriteLine(translation(name));
        }
    }
}