public void Show()
{
var a = "a";
var b = "b";
//通过new来建立委托的变量
DeletegateTest test = new DeletegateTest((string x, string y) =>
{
Console.WriteLine(x);
Console.WriteLine(y);
});
test(a, b);
//使用逆名方法的委托实现委托实例
DeletegateTest test2 = delegate(string x, string y)
{
Console.WriteLine(x);
Console.WriteLine(y);
};
test2(a, b);
//使用Lambda Expressions实现委托实例
DeletegateTest test3 = (string x, string y) =>
{
Console.WriteLine(x);
Console.WriteLine(y);
};
test3(a, b);
//使用方法的注册来实例化委托
DeletegateStep1 stepAction = new DeletegateStep1();
GreetingsDelegate greetingDelegate = new GreetingsDelegate(stepAction.Greetings);
GreetingsDelegate greetingDelegate2 = stepAction.Greetings;
string result = greetingDelegate("welcome,tester");
Console.WriteLine(result);
result = greetingDelegate2("jack");
Console.WriteLine(result);
//string result1 = greetingDelegate.Invoke("welcome,tester");
IAsyncResult asyncResult = greetingDelegate.BeginInvoke("welcome,tester", null, null);
//调用EndInvoke方法获取异步执行的结果
var invokeResult = greetingDelegate.EndInvoke(asyncResult);
//BeginInvoke虽然是异步，但是仍然阻塞主线程
Console.WriteLine(invokeResult);
//通过回调函数来避免阻塞，而将整个结果的返回写在AsyncCallBack里面
//这种可以达到异步的效果，不阻塞主线程
greetingDelegate.BeginInvoke("welcome,airven", ExcuteCompleted, null);
Console.WriteLine("end");
Console.Read();
}
public void ExcuteCompleted(IAsyncResult IResult)
{
Thread.Sleep(5000);
Console.WriteLine("AddComplete running on thread {0}", Thread.CurrentThread.ManagedThreadId);
//获取绑定函数的引用
AsyncResult ar = (AsyncResult)IResult;
GreetingsDelegate delBp = (GreetingsDelegate)ar.AsyncDelegate;
//等待函数执行完毕
string result = delBp.EndInvoke(IResult);
Console.WriteLine("5 + 5 ={0}", result);
}