Lambda表达式拆解

1. static string GetResult(Func<string, string> f)
           {
               string s = "ZAZA";
               return f(s);
           }
           /// <summary>
           /// Main
           /// </summary>
           /// <param name="args"></param>
           static void Main(string[] args)
           {
               Console.WriteLine(GetResult(GetStr));
           }
           /// <summary>
           /// 获取字符串
           /// </summary>
           /// <param name="str"></param>
           /// <returns></returns>
           static string GetStr(string str)
           {
               return str + "is dont";
           }

   获取字符串转换成匿名方法

2. /// <summary>
           /// 获取结果
           /// </summary>
           /// <param name="f"></param>
           /// <returns></returns>
           static string GetResult(Func<string, string> f)
           {
               string s = "ZAZA";
               return f(s);
           }
           /// <summary>
           /// Main
           /// </summary>
           /// <param name="args"></param>
           static void Main(string[] args)
           {
               Console.WriteLine(
                   GetResult(
                                delegate (string str){
                                   return str + "is dont";
                                }
                            )
                );
           }  

   转换箭头函数

3. /// <summary>
           /// 获取结果
           /// </summary>
           /// <param name="f"></param>
           /// <returns></returns>
           static string GetResult(Func<string, string> f)
           {
               string s = "ZAZA";
               return f(s);
           }
           /// <summary>
           /// Main
           /// </summary>
           /// <param name="args"></param>
           static void Main(string[] args)
           {
               Console.WriteLine(
                   GetResult(
                                (string str)=>{
                                   return str + "is dont";
                                }
                            )
                );
           }       

   简写

4. /// <summary>
           /// 获取结果
           /// </summary>
           /// <param name="f"></param>
           /// <returns></returns>
           static string GetResult(Func<string, string> f)
           {
               string s = "ZAZA";
               return f(s);
           }
           /// <summary>
           /// Main
           /// </summary>
           /// <param name="args"></param>
           static void Main(string[] args)
           {
               Console.WriteLine(
                   GetResult(str=> str + "is dont")
                );
           }  

5. 参数列表 => 语句或语句块

　　　　例子:

//无返回值 无参数
            //void getstring(){Console.WriteLine("xxx")}
            Action action = () => Console.WriteLine("xxx");
            action();

            //无返回值 一个参数  void getstring(string str){Console.WriteLine(str)}
            Action<string> actionpram =s=> Console.WriteLine(s);
            actionpram("SayWhat?");

            //无返回值 多个参数
            //void getstring(string s,string d){Console.WriteLine($"第一个参数{s},第二个参数{d}")}
            Action<string,string> actionprams = (s,d) => Console.WriteLine($"第一个参数{s},第二个参数{d}");
            actionprams("what up","say Hi!");



            //有返回值 无参数
            //DateTime getDate(){return DateTime.Now;}
            Func<DateTime> fnc = () => DateTime.Now;

            //有返回值 一个参数
            // DateTime getDate(string time){return Convert.ToDateTime(s);}
            Func<string,DateTime> fn = s =>Convert.ToDateTime(s);

            //有返回值 多个参数
            // string getString(int a,int b){return (a+b).ToString();} 
            Func<int,int, string> fncc = (i1,i2) => (i1+i2).ToString();