http://msdn.microsoft.com/library/CHS/cpguide/html/cpconEvents.asp
我们先来改造一下上次的程序，为上次的主线程方法添加事件，能不断的引发事件来汇报处理的进度：
public class MyEventArgs
{
private int _rate;
public int Rate
{
get
{
return _rate;
}
}
public MyEventArgs(int rate)
{
this._rate=rate;
}
}
public class MyObject
{
public delegate void MyEventHandler(object sender,MyEventArgs e);
public event MyEventHandler MyEvent;
public void ALongTimeMethod(int time)
{
Console.WriteLine("主线程方法开始");
for(int i=0;i<100;i++)
{
System.Threading.Thread.Sleep(time);
OnMyEvent(new MyEventArgs(i));
}
Console.WriteLine("主线程方法结束");
}
protected void OnMyEvent(MyEventArgs e)
{
if (MyEvent!=null)
{
MyEvent(this,e);
}
}
}
再来为事件添加处理程序：
class MyClient
{
[STAThread]
static void Main(string[] args)
{
DateTime dt=DateTime.Now;
MyObject obj=new MyObject();
obj.MyEvent+=new MyObject.MyEventHandler(obj_MyEvent);
obj.ALongTimeMethod(50);
Console.WriteLine("用了"+((TimeSpan)(DateTime.Now-dt)).TotalSeconds+"秒");
Console.ReadLine();
}
public static void obj_MyEvent(object sender,MyEventArgs e)
{
Console.WriteLine("主线程方法完成了"+e.Rate+"%");
}
}
运行程序可以看到：
这个是本地的，远程对象的事件也这么简单吗？其实没有想象的简单，因为对象是在远程的，服务端的事件客户端怎么捕捉？应该说远程对象的事件可以分成客户端触发－》服务器应答，服务端触发－》客户端应答和客户端触发－》客户端应答，第一种就很简单了，后面2种都需要有一个中间件。下面我们来要为程对象同样来添加一个进度机制，首先来建立我们的远程对象：
[Serializable]
public class MyEventArgs:EventArgs
{
private int _rate;
private string _ip;
public int Rate
{
get
{
return _rate;
}
}
public string IP
{
get
{
return _ip;
}
}
public MyEventArgs(int rate,string ip)
{
this._rate=rate;
this._ip=ip;
}
}
public class MyObject:MarshalByRefObject
{
public delegate void MyEventHandler(object sender,MyEventArgs e);
public event MyEventHandler MyEvent;
public int ALongTimeMethod(int a,int b,int time,string ip)
{
Console.WriteLine("异步方法开始");
for(int i=0;i<10;i++)
{
System.Threading.Thread.Sleep(time);
OnMyEvent(new MyEventArgs(i,ip));
}
Console.WriteLine("异步方法结束");
return a+b;
}
protected void OnMyEvent(MyEventArgs e)
{
if (MyEvent!=null)
{
MyEvent(this,e);
}
}
}
为了调试方便，服务器端和客户端这次都用程序实现，下面是服务器端：
using System;
using System.Collections;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Serialization.Formatters;
namespace RemoteServer
{
class MyServer
{
[STAThread]
static void Main(string[] args)
{
RemotingConfiguration.RegisterWellKnownServiceType(typeof(RemoteObject.MyObject),"RemoteObject.MyObject",WellKnownObjectMode.Singleton);
BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
BinaryClientFormatterSinkProvider clientProvider = new BinaryClientFormatterSinkProvider();
serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
IDictionary props = new Hashtable();
props["port"]=9999;
TcpChannel channel = new TcpChannel(props,clientProvider,serverProvider);
ChannelServices.RegisterChannel(channel);
Console.ReadLine();
}
}
}
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