实现Web Service数据压缩的完整步骤

Step 0. 下载 ICSharpCode.SharpZipLib.dll

Step 1. 扩展 System.Web.Services.Protocols.SoapExtension,代码如下:

using System;
using System.Collections.Generic;
using System.Text;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.IO;

using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
using ICSharpCode.SharpZipLib.Core;

namespace SoapCompressionExtension
{
    public class CompressionSoapExtensionCore : SoapExtension
    {
        Stream oldStream;
        Stream newStream;


        //必须重载的方法
        public override Stream ChainStream(Stream stream)
        {
            oldStream = stream;
            newStream = new MemoryStream();
            return newStream;
            
        }
  
        //必须重载的方法
        public override object GetInitializer(LogicalMethodInfo methodInfo, SoapExtensionAttribute attribute)
        {
            return null;
        }

        //必须重载的方法
        public override object GetInitializer(Type WebServiceType)
        {
            return null;
        }

        //必须重载的方法
        public override void Initialize(object initializer){}

        //必须重载的方法
        public override void ProcessMessage(SoapMessage message)
        {
            
            switch (message.Stage)
            {

            case SoapMessageStage.BeforeSerialize:
                break;

            case SoapMessageStage.AfterSerialize:
                //压缩
                Compress(message);
                break;

            case SoapMessageStage.BeforeDeserialize:
                //解压缩
                Decompress(message);
                break;

            case SoapMessageStage.AfterDeserialize:
                break;

            default:
                throw new Exception("invalid stage");
            }
        }

        private void Compress(SoapMessage message)
        {
            using (GZipOutputStream gzip = new GZipOutputStream(oldStream))
            {
                message.Stream.Position = 0;
                StreamUtils.Copy(message.Stream, gzip, new byte[4096]);
            }
 
        }

        private void Decompress(SoapMessage message)
        {

            using (Stream s = new GZipInputStream(oldStream))
            {
                StreamUtils.Copy(s, message.Stream, new byte[4096]);
            }
            message.Stream.Position = 0;
           
        }



    }


}

 

 

Step 2. 配置Web Service,拷贝以下配置代码到<system.web></system.web>
<webServices>
     <soapExtensionTypes>
          <add type="SoapCompressionExtension.CompressionSoapExtensionCore,SoapCompressionExtension" priority="3" group="0"/>
     </soapExtensionTypes>
</webServices>

 

Step 3. 配置客户端
  1) WinForm 程序配置方法: 拷贝以下代码到app.config的<configuration></configuration>节点内。
  <system.web>
       <webServices>
          <soapExtensionTypes>
               <add type="SoapCompressionExtension.CompressionSoapExtensionCore,SoapCompressionExtension" priority="3" group="0"/>
          </soapExtensionTypes>
  </webServices>
 </system.web>
 
 2) Asp.net 程序配置方法: 拷贝以下配置代码到web.config的<system.web></system.web>节点内。
 <webServices>
     <soapExtensionTypes>
          <add type="SoapCompressionExtension.CompressionSoapExtensionCore,SoapCompressionExtension" priority="0" group="0"/>
     </soapExtensionTypes>
</webServices>