http://msdn.microsoft.com/library/CHS/cpguide/html/cpconEvents.asp
我們爲主線程方法添加事件,能不斷的引發事件來彙報處理的進度:
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("主線程方法開始");
for(int i=0;i<100;i++)
{
System.Threading.Thread.Sleep(time);
OnMyEvent(new MyEventArgs(i));
}
Console.WriteLine("主線程方法結束");
}
protected void OnMyEvent(MyEventArgs e)
{
if (MyEvent!=null)
{
MyEvent(this,e);
}
}
}
{
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("主線程方法開始");
for(int i=0;i<100;i++)
{
System.Threading.Thread.Sleep(time);
OnMyEvent(new MyEventArgs(i));
}
Console.WriteLine("主線程方法結束");
}
protected void OnMyEvent(MyEventArgs e)
{
if (MyEvent!=null)
{
MyEvent(this,e);
}
}
}
再來爲事件添加處理程序:
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("主線程方法完成了"+e.Rate+"%");
}
}
{
[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("主線程方法完成了"+e.Rate+"%");
}
}
這個是本地的,遠程對象的事件也這麼簡單嗎?其實沒有想象的簡單,因爲對象是在遠程的,服務端的事件客戶端怎麼捕捉?應該說遠程對象的事件可以分成客戶端觸發-》服務器應答,服務端觸發-》客戶端應答和客戶端觸發-》客戶端應答,第一種就很簡單了,後面2種都需要有一箇中間件。下面我們來要爲程對象同樣來添加一個進度機制,首先來建立我們的遠程對象:
[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("異步方法開始");
for(int i=0;i<10;i++)
{
System.Threading.Thread.Sleep(time);
OnMyEvent(new MyEventArgs(i,ip));
}
Console.WriteLine("異步方法結束");
return a+b;
}
protected void OnMyEvent(MyEventArgs e)
{
if (MyEvent!=null)
{
MyEvent(this,e);
}
}
}
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("異步方法開始");
for(int i=0;i<10;i++)
{
System.Threading.Thread.Sleep(time);
OnMyEvent(new MyEventArgs(i,ip));
}
Console.WriteLine("異步方法結束");
return a+b;
}
protected void OnMyEvent(MyEventArgs e)
{
if (MyEvent!=null)
{
MyEvent(this,e);
}
}
}
爲了調試方便,服務器端和客戶端這次都用程序實現,下面是服務器端:
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();
}
}
}
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();
}
}
}
客戶端爲了簡單一點,我去除了前面做測試的本地事件:
using System;
using System.Net;
using System.Collections;
using System.Text;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Serialization.Formatters;
class MyClient
{
private delegate int MyDelegate(int a,int b,int time,string ip);
private static MyDelegate md;
[STAThread]
static void Main(string[] args)
{
DateTime dt=DateTime.Now;
RemotingConfiguration.RegisterWellKnownClientType(typeof(RemoteObject.MyObject), "tcp://localhost:9999/RemoteObject.MyObject");
BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
BinaryClientFormatterSinkProvider clientProvider = new BinaryClientFormatterSinkProvider();
serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
IDictionary props=new Hashtable();
props["port"]=0;
TcpChannel channel = new TcpChannel(props,clientProvider,serverProvider);
ChannelServices.RegisterChannel(channel);
RemoteObject.MyObject app=new RemoteObject.MyObject();
app.MyEvent+=new RemoteObject.MyObject.MyEventHandler(MyEvent);
md=new MyDelegate(app.ALongTimeMethod);
AsyncCallback ac=new AsyncCallback(MyClient.CallBack);
IPHostEntry ipHE=Dns.GetHostByName(Dns.GetHostName());
IAsyncResult Iar=md.BeginInvoke(1,2,300,ipHE.AddressList[0].ToString(),ac,null);
Method();
Console.WriteLine("用了"+((TimeSpan)(DateTime.Now-dt)).TotalSeconds+"秒");
ChannelServices.UnregisterChannel(channel);
Console.ReadLine();
}
public static void CallBack(IAsyncResult Iar)
{
if(Iar.IsCompleted)
{
Console.WriteLine("結果是"+md.EndInvoke(Iar));
}
}
public static void MyEvent(object sender,RemoteObject.MyEventArgs e)
{
Console.WriteLine("來自"+e.IP+"的異步方法完成了"+e.Rate*10+"%");
}
public static void Method()
{
Console.WriteLine("主線程方法開始");
System.Threading.Thread.Sleep(5000);
Console.WriteLine("主線程方法結束");
}
}
using System.Net;
using System.Collections;
using System.Text;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Serialization.Formatters;
class MyClient
{
private delegate int MyDelegate(int a,int b,int time,string ip);
private static MyDelegate md;
[STAThread]
static void Main(string[] args)
{
DateTime dt=DateTime.Now;
RemotingConfiguration.RegisterWellKnownClientType(typeof(RemoteObject.MyObject), "tcp://localhost:9999/RemoteObject.MyObject");
BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
BinaryClientFormatterSinkProvider clientProvider = new BinaryClientFormatterSinkProvider();
serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
IDictionary props=new Hashtable();
props["port"]=0;
TcpChannel channel = new TcpChannel(props,clientProvider,serverProvider);
ChannelServices.RegisterChannel(channel);
RemoteObject.MyObject app=new RemoteObject.MyObject();
app.MyEvent+=new RemoteObject.MyObject.MyEventHandler(MyEvent);
md=new MyDelegate(app.ALongTimeMethod);
AsyncCallback ac=new AsyncCallback(MyClient.CallBack);
IPHostEntry ipHE=Dns.GetHostByName(Dns.GetHostName());
IAsyncResult Iar=md.BeginInvoke(1,2,300,ipHE.AddressList[0].ToString(),ac,null);
Method();
Console.WriteLine("用了"+((TimeSpan)(DateTime.Now-dt)).TotalSeconds+"秒");
ChannelServices.UnregisterChannel(channel);
Console.ReadLine();
}
public static void CallBack(IAsyncResult Iar)
{
if(Iar.IsCompleted)
{
Console.WriteLine("結果是"+md.EndInvoke(Iar));
}
}
public static void MyEvent(object sender,RemoteObject.MyEventArgs e)
{
Console.WriteLine("來自"+e.IP+"的異步方法完成了"+e.Rate*10+"%");
}
public static void Method()
{
Console.WriteLine("主線程方法開始");
System.Threading.Thread.Sleep(5000);
Console.WriteLine("主線程方法結束");
}
}
代碼看上去不錯,可是debug啓動後報錯:
這就是我前面提到的問題,遠程不可能有本地的程序集,也無法觸發本地事件。解決辦法就是加一個事件中間件,繼承MarshalByRefObject:
public class EventClass:MarshalByRefObject
{
public void MyEvent(object sender,MyEventArgs e)
{
Console.WriteLine("來自"+e.IP+"的異步方法完成了"+e.Rate*10+"%");
}
}
{
public void MyEvent(object sender,MyEventArgs e)
{
Console.WriteLine("來自"+e.IP+"的異步方法完成了"+e.Rate*10+"%");
}
}
然後來修改一下客戶端:
把app.MyEvent+=new RemoteObject.MyObject.MyEventHandler(MyEvent);修改爲
RemoteObject.EventClass ec=new RemoteObject.EventClass();
app.MyEvent+=new RemoteObject.MyObject.MyEventHandler(ec.MyEvent);
app.MyEvent+=new RemoteObject.MyObject.MyEventHandler(ec.MyEvent);
運行一下程序:
前後兩個窗口本別是服務端和客戶端的,貌似達到了我們的要求,其實不然,程序有2個漏洞:
1、客戶端關閉以後打開新的程序就出錯,因爲以前的委託鏈丟失,服務端程序企圖觸發事件出錯。
2、同時打開幾個客戶端,客戶端收到的是所有的進度信息,而不僅僅是自己的,廣播性質的消息。