using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  public class ConcreteHandler1:Handler
  {
    public override void HandRequest(int request)
    {
      if(request>0&&request<10)
      {
        Console.WriteLine("{0} 处理请求 {1}",this.GetType().Name,request);
      }
      else if(successor!=null)
      {
        successor.HandRequest(request);
      }
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  public class ConcreteHandler2:Handler
  {
    public override void HandRequest(int request)
    {
      if (request > 10 && request < 20)
      {
        Console.WriteLine("{0} 处理请求 {1}", this.GetType().Name, request);
      }
      else if (successor != null)
      {
        successor.HandRequest(request);
      }
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  public class ConcreteHandler3:Handler
  {
    public override void HandRequest(int request)
    {
      if (request > 20 && request < 30)
      {
        Console.WriteLine("{0} 处理请求 {1}", this.GetType().Name, request);
      }
      else if (successor != null)
      {
        successor.HandRequest(request);
      }
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  public abstract class Handler
  {
    protected Handler successor;
    public void SetSuccessor(Handler successor) 
    {
      this.successor = successor;
    }
    public abstract void HandRequest(int request);
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      Handler h1 = new ConcreteHandler1();
      Handler h2 = new ConcreteHandler2();
      Handler h3 = new ConcreteHandler3();
      h1.SetSuccessor(h2);
      h2.SetSuccessor(h3);
      int[] requests = {2,5,14,22,18,3,27,20};
      foreach(int request in requests)
      {
        h1.HandRequest(request);
      }
      Console.ReadKey();
    }
  }
}