HttpModule 实现 ASP.Net (*.aspx) 中文简繁体的自动转换,不用修改原有的任何代码,直接部署即可!

从8月份忙到现在还没忙完,还得再坚持几个月!
一直没时间更新blog,今天收到一封回复我以前的一篇blog的邮件,提醒了我!
http://Microshaoft.cnblogs.com/archive/2005/03/22/123365.aspx#288944
于是根据该网友的建议:
用 HttpModule 实现了 ASP.Net (*.aspx) 中文简繁体的自动转换!
思路相当简单!
Global.asax 的 Codebehind 的 Application_BeginRequest 的事件处理函数也应可以实现!
HttpHandler 是不能实现的,因为它是"截流"!


效果不错!可以处理任意 ASP.Net 站点、虚拟目录!不用修改原有的任何代码!
代码如下:
StrConvHttpModule.cs

/**//*
csc.exe /t:library StrConvHttpModule.cs /r:C:\windows\Microsoft.NET\Framework\v1.1.4322\Microsoft.VisualBasic.dll 
*/
namespace Microshaoft.HttpModules
{
    using System;
    using System.Web; 
    using System.Collections;

    using Microshaoft.IO;

    public class StrConvHttpModule : IHttpModule
    {
        public string ModuleName
        {
            get
            {
                return "StrConvHttpModule";
            }
        }

        public void Init(HttpApplication application)
        {
            application.BeginRequest += (new EventHandler(this.Application_BeginRequest));
        }
        
        private void Application_BeginRequest(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication) sender;
            HttpContext context = application.Context;
            context.Response.Filter = new StrConvFilterStream(context.Response.Filter);
        }

        public void Dispose()
        {
        }
    }
}

namespace Microshaoft.IO
{
    using System;
    using System.IO;
    using System.Web;
    using System.Text;
    using System.Globalization;

    using Microsoft.VisualBasic;

    public class StrConvFilterStream : Stream
    {
        private Stream _sink;
        private long _position;

        public StrConvFilterStream(Stream sink)
        {
            this._sink = sink;
        }

        public override bool CanRead
        {
            get
            {
                return true;
            }
        }

        public override bool CanSeek
        {
            get
            {
                return true;
            }
        }

        public override bool CanWrite
        {
            get
            {
                return true;
            }
        }

        public override long Length
        {
            get
            {
                return 0;
            }
        }

        public override long Position
        {
            get
            {
                return this._position;
            }
        set
            {
                this._position = value;
            }
        }

        public override long Seek(long offset, SeekOrigin direction)
        {
            return this._sink.Seek(offset, direction);
        }

        public override void SetLength(long length)
        {
            this._sink.SetLength(length);
        }

        public override void Close()
        {
            this._sink.Close();
        }

        public override void Flush()
        {
            this._sink.Flush();
        }

        public override int Read(byte[] buffer, int offset, int count)
        {
            return this._sink.Read(buffer, offset, count);
        }

        public override void Write(byte[] buffer, int offset, int count)
        {
            if (HttpContext.Current.Response.ContentType == "text/html")
            {
                Encoding e = Encoding.GetEncoding(HttpContext.Current.Response.Charset);
                string s = e.GetString(buffer, offset, count);
                s = Strings.StrConv(s, VbStrConv.TraditionalChinese, CultureInfo.CurrentCulture.LCID);
                this._sink.Write(e.GetBytes(s), 0, e.GetByteCount(s));
            }
            else
            {
                this._sink.Write(buffer, offset, count);
            }
        }
    }
}

将 StrConvHttpModule.cs 编译为 StrConvHttpModule.dll:
csc.exe /t:library StrConvHttpModule.cs /r:C:\windows\Microsoft.NET\Framework\v1.1.4322\Microsoft.VisualBasic.dll

以 Microsoft .NET Framework SDK 自带的  QuickStart 教程站点为例
http://localhost/quickstart/
修改 quickstart 虚拟目录下的 web.config, 在 <system.web>...</system.web> 区域添加如下配置节:

    <httpModules>
        <add name="StrConvHttpModule" type="Microshaoft.HttpModules.StrConvHttpModule, StrConvHttpModule" />
    </httpModules>

将 StrConvHttpModule.dll 复制到 该虚拟目录的 bin\ 目录下
,以及该虚拟目录下的各级子虚拟目录下的 bin\ 目录下

收功!