学步园

 using System;<br /> using System.Collections.Generic;<br /> using System.Text;</p> <p>namespace ConsoleApplication1<br /> {<br /> class 简单的委托实例<br /> {<br /> public static double Area(double Val)<br /> {<br /> return Val * 2;<br /> }<br /> public static double Scare(double Val)<br /> {<br /> return Val * Val;<br /> }<br /> }<br /> class Test<br /> {<br /> public delegate double delegateTest(double dd);<br /> static void Main()<br /> {<br /> //实例化了个委托数组,（一旦定义了委托类,就可以实例化它的实例）<br /> delegateTest[] Operations =<br /> {<br /> //说明了委托的一种方式,把方法组合到数组<br /> new delegateTest(简单的委托实例.Area),<br /> new delegateTest(简单的委托实例.Scare)<br /> };<br /> for (int i = 0; i < Operations.Length; i++)<br /> {<br /> Console.WriteLine("Using Operations[{0}]", i);<br /> Test MyTest = new Test();</p> <p> //把委托传递给ProcessDelagate()这个方法,Operations[0]可以理解成delegateTest Operations =new delegateTest(简单的委托实例.Area);调用ProcessDelagate这个方法的时候Operations代理的方法是简单的委托实例.Area<br /> MyTest.ProcessDelagate(Operations[i], 12.0);<br /> MyTest.ProcessDelagate(Operations[i], 2.0);<br /> Console.WriteLine();<br /> }<br /> }<br /> //把委托作为一个参数传递到ProcessDelagate()第一个参数中<br /> void ProcessDelagate(delegateTest Action, double d)<br /> {<br /> double Result = Action(d);<br /> Console.WriteLine("提供的值是{0},结果是{1}", d, Result);<br /> }<br /> }<br /> }<br />

using System;<br /> using System.Collections.Generic;<br /> using System.Text;</p> <p>namespace ConsoleApplication1<br /> {<br /> //如果要多次调用这个方法,那么就要多次调用这个委托,委托包含多个方法,这个种委托就是多播委托！<br /> class 多播委托<br /> {<br /> //用的是void没有返回值<br /> public delegate void DelageteTest(double val);<br /> static void Main()<br /> {<br /> //多播委托中添加2个方法<br /> DelageteTest MyTest = new DelageteTest(Test.Area);<br /> MyTest += new DelageteTest(Test.Scare);<br /> //下面的代码跟上面的3行代码是等价的<br /> //DelageteTest MyTest;<br /> //DelageteTest Test1 = new DelageteTest(Test.Area);<br /> //DelageteTest Test2 = new DelageteTest(Test.Scare);<br /> //MyTest = Test1 + Test2;</p> <p> 多播委托 多 = new 多播委托();<br /> 多.OPreation(MyTest, 2.0);<br /> 多.OPreation(MyTest, 12.0);<br /> }<br /> void OPreation(DelageteTest Action, double d)<br /> {<br /> Action(d);<br /> }<br /> }<br /> class Test<br /> {<br /> public static void Area(double Val)<br /> {<br /> Console.WriteLine(Val * 2);<br /> }<br /> public static void Scare(double Val)<br /> {<br /> Console.WriteLine(Val * Val);<br /> }<br /> }</p> <p>}<br />