如何：创建客户端激活类型的实例

本文介绍实例化客户端激活对象的两种方式。第一种方式使用 CreateInstance，第二种方式使用 new 运算符。

使用 Activator.CreateInstance 创建实例

1. 创建并注册 TcpChannel

   Dim channel As TcpChannel = New TcpChannel()
    ChannelServices.RegisterChannel(channel, False)
   TcpChannel channel = new TcpChannel();
   ChannelServices.RegisterChannel(channel, false);
   

2. 注册客户端激活的对象

   RemotingConfiguration.RegisterActivatedClientType( _
       GetType(MyRemoteObject), _
       "tcp://localhost:1234/MyServer")
   RemotingConfiguration.RegisterActivatedClientType(
       typeof(MyRemoteObject),
       "tcp://localhost:1234/MyServer");
   

3. 调用 CreateInstance

   Dim url() As Object = {New UrlAttribute("tcp://localhost:1234/Server")}
   Dim obj As MyRemoteObject = CType(Activator.CreateInstance( _
       GetType(MyRemoteObject), _
       Nothing, _
       url), MyRemoteObject)
   
   object[] url = { new UrlAttribute("tcp://localhost:1234/Server") };
   MyRemoteObject obj = (MyRemoteObject)Activator.CreateInstance(
       typeof(MyRemoteObject),
       null,
       url);
   

使用 New 运算符创建实例

1. 创建并注册信道

   Dim channel As TcpChannel = New TcpChannel()
    ChannelServices.RegisterChannel(channel, False)
   TcpChannel channel = new TcpChannel();
   ChannelServices.RegisterChannel(channel, false);
   

2. 注册客户端激活的对象

   RemotingConfiguration.RegisterActivatedClientType( _
       GetType(MyRemoteObject), _
       "tcp://localhost:1234/MyServer")
   RemotingConfiguration.RegisterActivatedClientType(
       typeof(MyRemoteObject),
       "tcp://localhost:1234/MyServer");
   

3. 调用 new 运算符

   Dim obj As MyRemoteObject = New MyRemoteObject(123)
   MyRemoteObject obj = new MyRemoteObject(123);
   

示例

下面的代码阐释了这两种创建客户端激活实例的方法：

Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels
Imports System.Runtime.Remoting.Channels.Tcp
Imports System.Runtime.Remoting.Activation
Imports Server

Module Client

    Sub Main()
        ' Create and register a channel
        Dim channel As TcpChannel = New TcpChannel()
        ChannelServices.RegisterChannel(channel, False)

  ' Register the client activated object
        RemotingConfiguration.RegisterActivatedClientType( _
            GetType(MyRemoteObject), _
            "tcp://localhost:1234/MyServer")

  ' Call Activator.CreateInstance

    Dim obj As MyRemoteObject = CType(Activator.CreateInstance( _
       GetType(MyRemoteObject), _
       Nothing, _

           url), MyRemoteObject)
   
        ' OR call operator new
        Dim obj As MyRemoteObject = New MyRemoteObject(123)

        Console.WriteLine("Client.Main(): GetValue returned: {0}", obj.GetValue())
        Console.WriteLine("Client.Main(): Calling SetValue(10)")
        obj.SetValue(10)
        Console.WriteLine("Client.Main(): GetValue returned: {0}", obj.GetValue())
    End Sub

End Module

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

namespace Client
{
    class Client
    {
        static void Main(string[] args)
        {
// Create and register channel
            TcpChannel channel = new TcpChannel();
            ChannelServices.RegisterChannel(channel, false);

// Register client activated object
            RemotingConfiguration.RegisterActivatedClientType(
                typeof(MyRemoteObject),
                "tcp://localhost:1234/MyServer");

// Call Activator.CreateInstance

object[] url = { new  UrlAttribute("tcp://localhost:1234/Server") };
         MyRemoteObject obj = (MyRemoteObject)Activator.CreateInstance(
            typeof(MyRemoteObject),
            null,

               url);
      // OR call operator new
            MyRemoteObject obj = new MyRemoteObject(123);

            Console.WriteLine("Client.Main(): GetValue returned: " + obj.GetValue());
            Console.WriteLine("Client.Main(): Calling SetValue(10)");
            obj.SetValue(10);
            Console.WriteLine("Client.Main(): GetValue returned: " + obj.GetValue());
        }
    }
}

编译代码

此示例需要：

• 对 System 和 System.Runtime.Remoting 命名空间以及实现 MyRemoteObject 的命名空间的引用。

请参见

概念

激活远程对象
远程应用程序的配置
服务器激活
生存期租约
客户端激活

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