ITrackingHandler 介面

定義

命名空間:

System.Runtime.Remoting.Services

組件:

mscorlib.dll

指示實作的物件必須由遠端基礎結構來告知關於物件和 Proxy 的封送處理、解封送處理 (Unmarshaling) 和中斷連接。

public interface class ITrackingHandler

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

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

Public Interface ITrackingHandler

屬性

ComVisibleAttribute

範例

下列程式代碼範例示範如何實作 介面的方法 ITrackingHandler ，以接收來自遠端基礎結構的通知。

下列程式代碼範例示範如何實作此介面。

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());
    }
}

下列程式代碼範例示範如何在伺服器上實作此介面。

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);
    }
}

下列程式代碼範例示範如何在上述程式代碼範例中的伺服器用戶端上實作這個介面。

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.");
    }
}

下列程式代碼範例顯示伺服器和用戶端所使用的遠端物件。

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);
    }
}

備註

當目前AppDomain中的物件或 Proxy 封送處理、取消封送處理或中斷連線時，會呼叫向 註冊TrackingServices的每個物件。

請注意，只有物件可以中斷連線。 在 Proxy 上呼叫中斷連線時，會擲回例外狀況。

注意

此介面會提出連結需求。 如果立即呼叫端透過介面的參考進行呼叫，而且沒有基礎結構許可權，則會擲回 SecurityException。 如需詳細資訊 ，請參閱連結需求 。

方法

DisconnectedObject(Object)	告知目前執行個體，物件已經自其 Proxy 中斷連接。
MarshaledObject(Object, ObjRef)	告知目前執行個體，物件已經被封送處理。
UnmarshaledObject(Object, ObjRef)	告知目前執行個體，物件已經解除封送處理。