ITrackingHandler 接口

定义

public interface class ITrackingHandler

public interface ITrackingHandler

[System.Runtime.InteropServices.ComVisible(true)]
public interface ITrackingHandler

type ITrackingHandler = interface

[<System.Runtime.InteropServices.ComVisible(true)>]
type ITrackingHandler = interface

Public Interface ITrackingHandler

属性

ComVisibleAttribute

示例

下面的代码示例演示如何实现 接口的方法 ITrackingHandler ，以接收来自远程处理基础结构的通知。

下面的代码示例演示如何实现此接口。

using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Services;

// Intercept marshal, unmarshal, and disconnect events for an object.
public class TrackingHandler : ITrackingHandler
{
    // Called when the tracked object is marshaled.

    public void MarshaledObject(Object obj, ObjRef objRef)
    {
        // Notify the user of the marshal event.
        Console.WriteLine("Tracking: An instance of {0} was marshaled.", 
            obj.ToString());

        // Print the channel information.
        if (objRef.ChannelInfo != null)
        {
            // Iterate over ChannelData.
            foreach(object data in objRef.ChannelInfo.ChannelData)
            {
                if (data is ChannelDataStore)
                {
                    // Print the URIs from the ChannelDataStore objects.
                    string[] uris = ((ChannelDataStore)data).ChannelUris;
                    foreach(string uri in uris)
                        Console.WriteLine("ChannelUri: " + uri);
                }
            }
        }

        // Print the envoy information.
        if (objRef.EnvoyInfo != null)
            Console.WriteLine("EnvoyInfo: " + objRef.EnvoyInfo.ToString());

        // Print the type information.
        if (objRef.TypeInfo != null)
        {
            Console.WriteLine("TypeInfo: " + objRef.TypeInfo.ToString());
            Console.WriteLine("TypeName: " + objRef.TypeInfo.TypeName);
        }

        // Print the URI.
        if (objRef.URI != null)
            Console.WriteLine("URI: " + objRef.URI.ToString());
    }

    // Called when the tracked object is unmarshaled.
    public void UnmarshaledObject(Object obj, ObjRef objRef)
    {
        Console.WriteLine("Tracking: An instance of {0} was unmarshaled.", 
            obj.ToString());
    }

    // Called when the tracked object is disconnected.
    public void DisconnectedObject(Object obj)
    {
        Console.WriteLine("Tracking: An instance of {0} was disconnected.", 
            obj.ToString());
    }
}

下面的代码示例演示如何在服务器上实现此接口。

using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Remoting.Services;

public class Server
{
    public static void Main(string[] args)
    {
        // Register the TCP channel.
        TcpChannel channel = new TcpChannel(1234);
        ChannelServices.RegisterChannel(channel);

        // Register a tracking handler.
        ITrackingHandler handler1 = new TrackingHandler();
        TrackingServices.RegisterTrackingHandler(handler1);

        // Register a second handler.
        ITrackingHandler handler2 = new TrackingHandler();
        TrackingServices.RegisterTrackingHandler(handler2);

        // Get the number of currently registered handlers.
        Console.WriteLine("Registered tracking handlers: " + 
            TrackingServices.RegisteredHandlers.Length);

        // Remove the tracking handler from the registered handlers.
        TrackingServices.UnregisterTrackingHandler(handler2);
        Console.WriteLine("Registered tracking handlers: " + 
            TrackingServices.RegisteredHandlers.Length);

        // Create and marshal an object for remote invocation.
        RemoteService service = new RemoteService();
        ObjRef obj = RemotingServices.Marshal(service, "TcpService");

        // Wait for the user prompt.
        Console.WriteLine("\r\nPress ENTER to unmarshal the object.");
        Console.ReadLine();

        // Unmarshal the object.
        RemotingServices.Unmarshal(obj);

        // Wait for the user prompt.
        Console.WriteLine("Press ENTER to disconnect the object.");
        Console.ReadLine();

        // Disconnect the object.
        RemotingServices.Disconnect(service);
    }
}

下面的代码示例演示如何在客户端上为前面的代码示例中的服务器实现此接口。

using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;

public class Client
{
    public static void Main(string[] args)
    {
        // Register the TCP channel.
        ChannelServices.RegisterChannel(new TcpChannel());

        // Register the client for the remote object.
        WellKnownClientTypeEntry remoteType = new WellKnownClientTypeEntry(
            typeof(RemoteService),"tcp://localhost:1234/TcpService");
        RemotingConfiguration.RegisterWellKnownClientType(remoteType);

        // Create an instance of the remote object.
        RemoteService service = new RemoteService(); 

        // Invoke a method on the remote object.
        service.Hello("world");
        Console.WriteLine("Hello invoked on server.");
    }
}

下面的代码示例演示服务器和客户端使用的远程对象。

using System;

// Remote object.
public class RemoteService : MarshalByRefObject
{
    private DateTime startTime;

    public RemoteService()
    {
        // Notify the user that the constructor was invoked.
        Console.WriteLine("Constructor invoked.");
        startTime = DateTime.Now;
    }

    ~RemoteService()
    {
        // Notify the user that the finalizer was invoked.
        TimeSpan elapsedTime = 
            new TimeSpan(DateTime.Now.Ticks - startTime.Ticks);
        Console.WriteLine("Finalizer invoked after " + 
            elapsedTime.ToString() + " seconds.");
    }

    public void Hello(string name)
    {
        // Print a simple message.
        Console.WriteLine("Hello, " + name);
    }
}

注解

当当前 AppDomain 中的对象或代理被封送、取消封送或断开连接时，通过远程处理调用注册TrackingServices到的每个对象。

请注意，只有对象可以断开连接。 在代理上调用断开连接时，将引发异常。

方法

适用于