委托

为了让委托做某事，必须满足4个条件:

 1.声明委托类型

  2.必须有一个方法饱含了要执行的代码

  3.必须创建一个委托实例

  4.必须调用（invoke)委托实例

  #region

public delegate void StringProcessor(string input);

public class DelegateTest
{
public static void Run()
{
Person jon = new Person("Jon");
Person tom = new Person("Tom");
StringProcessor jonVotice, tomVotice, background;
////创建三个委托实例
jonVotice = new StringProcessor(jon.Say);
tomVotice = new StringProcessor(tom.Say);
background = new StringProcessor(Background.Note);
////调用委托实例
jonVotice("Hello,son");
tomVotice.Invoke("Hello,Dayy!");
background("An airplance files past.");
}
}

public class Person
{
private string name;

public Person(string name)
{
this.name = name;
}

public void Say(string message)
{
Console.WriteLine("{0} says:{1}", name, message);
}
}

public class Background
{
public static void Note(string note)
{
Console.WriteLine("{0}", note);
}
}

 

#endregion