static void Main(string[] args)
{
//都是传两个参数 但是维护性和可扩展性差
GreetPeople("zhangsan", Language.Chinese);
//维护性可扩展性好
MakeGreeting("zhangsan", EnglishGreeting);
//直接使用委托先后调用两个方法
//法1
GreetingDelete delegate1;
//赋值语句 注意先赋值后绑定 先绑定会出现编译错误
//使用了未赋值的局部变量
//TODO:委托的多路广播
delegate1 = EnglishGreeting;
//绑定语句
delegate1 += ChineseGreeting;
delegate1("zhang san");
Console.WriteLine();
//法2 委托是一个类 可以对其实例化
GreetingDelete delegate2 = new GreetingDelete(EnglishGreeting);
//绑定另一个方法
delegate2 += ChineseGreeting;
MakeGreeting("zhang san", delegate2);
//取消绑定另一个方法
delegate2 -= ChineseGreeting;
MakeGreeting("Jerry", delegate2);
Console.WriteLine();
//法3
GreetManager gm = new GreetManager();
GreetingDelete gd;
gd = EnglishGreeting;
gd += ChineseGreeting;
//非静态调用方法
gm.GreetPeople1("helen", gd);
//静态调用方法
//GreetManager.GreetPeople("helen",gd);
Console.WriteLine();
//法4
//对象封装的概念 将delegate3 变量封装到GreetManager类中
GreetManager gm1 = new GreetManager();
gm1.delegate3 = EnglishGreeting;
gm1.delegate3 += ChineseGreeting;
gm1.GreetPeople1("John ", gm1.delegate3);
Console.WriteLine();
//法5 不需要传参数gm1.delegate3
GreetManager gm2 = new GreetManager();
gm1.delegate3 = EnglishGreeting;
gm1.delegate3 += ChineseGreeting;
gm1.GreetPeople("John ");
//法6 控制委托的访问类型
GreetManager gm3 = new GreetManager();
gm3.delegate4 += EnglishGreeting;
gm3.delegate4 += ChineseGreeting;
gm3.GreetPeople("John ");
Console.ReadLine();
//GET NEW IDEAS
//委托又类似函数指针
//委托是一种异步通信机制
}
public void GreetPeople1(string name, GreetingDelete makeGreeting)
{
makeGreeting(name);
}
//委托实现
private static void MakeGreeting(string name, GreetingDelete makeGreeting)
{
makeGreeting(name);
}
