1.示例：根据对于字符串不同的处理方法逻辑private delegate void PrintString(string str);static void PrintStr( PrintString print,string str ){print(str);}static void Method1(string str) {Console.WriteLine(str);}static void Method2(string str){Debug.WriteLine(str);}static void Main(string[] args)
{PrintString method = Method1;PrintStr(method,"Test");method = Method2;PrintStr(method,"Test");Console.ReadKey();}

   class Program {static void PrintString(){Console.WriteLine("hello world.");}static void PrintInt(int i){Console.WriteLine(i);}static void PrintString(string str){Console.WriteLine(str);}static void PrintDoubleInt(int i1, int i2){Console.WriteLine(i1+i2);}static void Main(string[] args){//Action a = PrintString;//action是系统内置（预定义）的一个委托类型，它可以指向一个没有返回值，没有参数的方法//Action<int> a=PrintInt;//定义了一个委托类型，这个类型可以指向一个没有返回值，有一个int参数的方法//Action<string> a = PrintString;//定义了一个委托类型，这个类型可以指向一个没有返回值，有一个string参数的方法 在这里系统会自动寻找匹配的方法Action<int, int> a = PrintDoubleInt;a(34, 23);Console.ReadKey();//action可以后面通过泛型去指定action指向的方法的多个参数的类型 ，参数的类型跟action后面声明的委托类型是对应着的}}

  class Program {static int Test1(){return 1;}static int Test2(string str){Console.WriteLine(str);return 100;}static int Test3(int i, int j){return i + j;}static void Main(string[] args){//Func<int> a = Test1;//func中的泛型类型制定的是 方法的返回值类型//Console.WriteLine(a());//Func<string, int> a = Test2;//func后面可以跟很多类型，最后一个类型是返回值类型，前面的类型是参数类型，参数类型必须跟指向的方法的参数类型按照顺序对应Func<int, int, int> a = Test3;//func后面必须指定一个返回值类型，参数类型可以有0-16个，先写参数类型，最后一个是返回值类型int res = a(1, 5);Console.WriteLine(res);Console.ReadKey();}}

class Employee {public string Name { get; private set; }public int Salary { get; private set; }public Employee(string name, int salary){this.Name = name;this.Salary = salary;}//如果e1大于e2的话，返回true，否则返回falsepublic static bool Compare(Employee e1, Employee e2){if (e1.Salary > e2.Salary) return true;return false;}public override string ToString(){return Name + ":" + Salary;}}

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   class Program {static void Sort(int[] sortArray){bool swapped = true;do{swapped = false;for (int i = 0; i < sortArray.Length - 1; i++){if (sortArray[i] > sortArray[i + 1]){int temp = sortArray[i];sortArray[i] = sortArray[i + 1];sortArray[i + 1] = temp;swapped = true;}}} while (swapped);}static void CommonSort<T>(T[] sortArray, Func<T,T,bool>  compareMethod){bool swapped = true;do {swapped = false;for (int i = 0; i < sortArray.Length - 1; i++) {if (compareMethod(sortArray[i],sortArray[i+1])) {T temp = sortArray[i];sortArray[i] = sortArray[i + 1];sortArray[i + 1] = temp;swapped = true;}}} while (swapped);}static void Main(string[] args) {//int[] sortArray = new int[]{123,23,12,3,345,43,53,4};//Sort(sortArray);//foreach (var temp in sortArray)//{//    Console.Write(temp+" ");//}Employee[] employees = new Employee[]{new Employee("dsf",12), new Employee("435dsf",234), new Employee("234dsf",14), new Employee("ds234f",234), new Employee("dssfdf",90)};CommonSort<Employee>(employees,Employee.Compare);foreach (Employee em in employees){Console.WriteLine(em);}Console.ReadKey();}}

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     static void T1(){Console.WriteLine("ok");}static void T2(){Console.WriteLine("ook");}static void T3(){Console.WriteLine("oook");}static void M1(string msg){Console.WriteLine(msg);}static void M2(string msg){Console.WriteLine(msg);}static void M3(string msg){Console.WriteLine(msg);Console.WriteLine("第3个方法。。");}static void M4(string msg){Console.WriteLine(msg);}static void M5(string msg){Console.WriteLine(msg);}

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 class Program{static void Main(string[] args){#region 多播委托////一般第一个要使用=赋值，后续的方法可以使用+=来赋值。//Action<string> action = M1;//action += M2; //表示添加一个委托的引用 //action += M3;//action += M4;//action += M5;//action -= M3;//表示去除一个委托的引用if(action!=null){//防止为空，报错action("xxx");//一次性触发全部的方法。调用顺序不一定哦。            }//Console.ReadKey();#endregionMyDelegate md = new MyDelegate(T1);//为什么这么写呢？等下取消注释上面的代码反编译之后放截图就知道md = (MyDelegate)Delegate.Combine(md, new MyDelegate(T2), new MyDelegate(T3));// md();  下面的方法是获取所有注册的方法逐个调用Delegate[] delegates = md.GetInvocationList();for (int i = 0; i < delegates.Length; i++){(delegates[i] as MyDelegate)();}Console.ReadKey();//使用队列试试//Queue<MyDelegate> queue = new Queue<MyDelegate>();//queue.Enqueue(new MyDelegate(T1));//queue.Enqueue(T2);//queue.Enqueue(T3);//queue.Dequeue();//queue.Dequeue();//queue.Dequeue();
}