解决“不允许类型 System.DelegateSerializationHolder 和从中派生的类型(例如 System

最新推荐文章于 2022-03-16 14:43:00 发布

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本文介绍了解决.NET Framework 1.1中因安全级别设置导致的反序列化错误的方法。通过修改配置文件中的反序列化级别为Full，实现了一个聊天程序的远程处理功能。

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解决“不允许类型 System.DelegateSerializationHolder 和从中派生的类型(例如 System.DelegateSerializationHolder)在此安全级别上被反序列化”错误的办法。
在.NET Framework 1.1中安全级别默认是Low的，所以不能被反序列化。以下代码是是一个聊天程序，在修改了配置文件后就可以访问了。

远程处理程序：ChatCoordinator.cs

using System;
using System.Runtime.Remoting;
using System.Collections;

[Serializable]
public class SubmitEventArgs : EventArgs{

private string _string = null;
private string _alias = null;

   public SubmitEventArgs(string contribution, string contributor){
      this._string = contribution;
      this._alias = contributor;
   }

   public string Contribution{
      get{
         return _string;
      }
   }

   public string Contributor{
      get {
         return _alias;
      }
   }
}

public delegate void SubmissionEventHandler(object sender, SubmitEventArgs submitArgs);

public class ChatCoordinator : MarshalByRefObject{

   public ChatCoordinator(){
     Console.WriteLine("聊天控制对象已经建立。实例： " + this.GetHashCode().ToString());
   }
   public override object InitializeLifetimeService(){
      return null;
   }
   public event SubmissionEventHandler Submission;

public void Submit(string contribution, string contributor){
Console.WriteLine("{0} 发送： {1}.", contributor, contribution);

SubmitEventArgs e = new SubmitEventArgs(contribution, contributor);

      if (Submission != null){
Console.WriteLine("广播……");
         Submission(this, e);
      }
   }
}

宿主应用程序：Server.cs

using System;
using System.Runtime.Remoting;

public class Server
{
   public static void Main(string[] Args)
   {
  RemotingConfiguration.Configure("Central.config");
  Console.WriteLine("服务已经启动。按回车键退出。");
  Console.ReadLine();
   }
}

客户端应用程序：client.cs

using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Http;

public class ChatClient : MarshalByRefObject {

private string username = null;

public override object InitializeLifetimeService() {
return null;
}

   public ChatClient(string alias){

      this.username = alias;

   }

   public void Run(){

      RemotingConfiguration.Configure("Client.config");
      ChatCoordinator chatcenter = new ChatCoordinator();
      chatcenter.Submission += new SubmissionEventHandler(this.SubmissionReceiver);
      String keyState = "";

      while (true){
         Console.WriteLine("按0和回车键退出：/r/n");
         keyState = Console.ReadLine();

         if (String.Compare(keyState,"0", true) == 0)
            break;
         chatcenter.Submit(keyState, username);
      }
      chatcenter.Submission -= new SubmissionEventHandler(this.SubmissionReceiver);
   }

public void SubmissionReceiver(object sender, SubmitEventArgs args){

if (String.Compare(args.Contributor, username, true) == 0){
         Console.WriteLine("你的消息经被广播。。");
      }
      else
         Console.WriteLine(args.Contributor + " 说： " + args.Contribution);
      }

public static void Main(string[] Args){

      if (Args.Length != 1){
         Console.WriteLine("You need to type an alias.");
         return;
      }

      ChatClient client = new ChatClient(Args[0]);
         client.Run();
      }
}

服务器端配置文件：Central.config