1定义和使用委托
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class program
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{
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//1定义委托
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delegate Person CreatePersonHandle(string FirstName, string LastName, int Age);
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delegate void ShowEmployeeHandle(Employee emp);
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static void Main(string[] args)
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{
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//3委托的使用
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CreatePersonHandle eh = CreateEmployee;
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Employee emee = (Employee)eh("Pony", "Smith", 41);//委托调用
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ShowEmployeeHandle seh = ShowPerson;
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seh(emee);
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}
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//2定义要被委托的处理方法,声明与委托一致
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static Employee CreateEmployee(string FirstName, string LastName, int Age)
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{
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return new Employee(FirstName, LastName, Age);
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}
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static void ShowPerson(Person p)
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{
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Console.WriteLine("姓名:{0} {1} 年龄:{2}", p.firstName, p.lastName, p.age);
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}
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class Person
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{
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public string firstName;
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public string lastName;
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public int age;
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public Person(string a, string b, int c)
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{
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firstName = a;
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lastName = b;
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age = c;
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}
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}
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class Employee : Person
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{
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public Employee(string a, string b, int c)
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: base(a, b, c)
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{
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}
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}
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}
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2使用委托和事件
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class program
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{
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static void Main(string[] args)
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{
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//4使用委托和事件
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Point point = new Point();
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point.Create += new Point.OnCreate(pnt_Create);
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//5此时调用了Point的Create事件时自动调用我们自定义的pnt_Create
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}
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//3定义要添加的事件处理
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static void pnt_Create(Object sender, EventArgs e)
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{
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Console.WriteLine("OK");
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}
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class Point
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{
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//使用委托和事件
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//1首先先定义委托
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public delegate void OnCreate(Object Sender, EventArgs e);
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//2创建事件
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private static event OnCreate _Create;
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public event OnCreate Create
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{
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add { _Create += value; }
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remove { _Create -= value; }
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}
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}
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}
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3类内部实现事件处理
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class program
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