asp.net下URL重写及PostBack处理

原文：http://www.cnblogs.com/hejunrex/archive/2009/12/29/1635172.html

URL重写是截取传入Web 请求并自动将请求重定向到其他 URL 的过程。

比如:浏览器发来请求 http://localhost:90/URLRewriter/1.html ，

服务器自动将这个请求中定向为http://localhost:90/URLRewriter/url.aspx?id=1

URLRewriter下载编译后提取其中的URLRewriter.dll和ActionlessForm.dll

一、URL重写

项目引用URLRewriter.dll

---------------------------------

web.config配置：

<?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
  <configSections>
    <section name="RewriterConfig" type="URLRewriter.Config.RewriterConfigSerializerSectionHandler, URLRewriter" />
  </configSections>
 
  <RewriterConfig>
    <Rules>
      <RewriterRule>
        <LookFor>~/URLRewriter/(.[0-9]*)\.html</LookFor>
        <SendTo>~/URLRewriter/url.aspx?id=$1</SendTo>
      </RewriterRule>
      <RewriterRule>
        <LookFor>~/web</LookFor>
        <SendTo>~/URLRewriter/url.aspx</SendTo>
      </RewriterRule>
    </Rules>
  </RewriterConfig>
 
  <system.web>
    <httpHandlers>
      <!--URLRewriter begin 使用 HTTP 处理程序执行重写-->
      <!--<add verb="*" path="*.aspx" type="URLRewriter.RewriterFactoryHandler, URLRewriter" />
      <add verb="*" path="*.html" type="URLRewriter.RewriterFactoryHandler, URLRewriter" />-->
      <!--URLRewriter end-->
    </httpHandlers>
       
    <httpModules>
      <!--URLRewriter begin 使用 HTTP 模块执行重写 -->
      <add type="URLRewriter.ModuleRewriter, URLRewriter" name="ModuleRewriter"/>
      <!--URLRewriter end-->
    </httpModules>
  </system.web>
 
</configuration>

----------------------------------IIS配置：

网站--属性--主目录--配置--插入--C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll

将文件是否存在 勾去掉

二、处理PostBack回发

ActionlessForm.dll以重写Form的方式用于处理PostBack回发后URL变为原始地址

项目引用ActionlessForm.dll在页面中注册一下

<%@ Register TagPrefix="skm" Namespace="ActionlessForm" Assembly="ActionlessForm" %>

将页面中的<form runat="server"></form>替换成:<skm:form id="form1" runat="server"></skm:form>

注：以这种方式处理回发将会在设计器中查看的时候为错误提示Form不可用

所以采用以下方法处理：

在微软的URLRewriter类库中添加以下类之后编译

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// FormRewriter 的摘要说明
/// </summary>
namespace URLRewriter.Form
{
    public class FormRewriterControlAdapter : System.Web.UI.Adapters.ControlAdapter
    {
        public FormRewriterControlAdapter()
        {
        }

        protected override void Render(HtmlTextWriter writer)
        {
            base.Render(new RewriteFormHtmlTextWriter(writer));
        }
    }

    public class RewriteFormHtmlTextWriter : HtmlTextWriter
    {
        public RewriteFormHtmlTextWriter(HtmlTextWriter writer)
            : base(writer)
        {
            base.InnerWriter = writer.InnerWriter;
        }
        public RewriteFormHtmlTextWriter(System.IO.TextWriter writer)
            : base(writer)
        {
            base.InnerWriter = writer;
        }

        public override void WriteAttribute(string name, string value, bool fEncode)
        {
            //If the attribute we are writing is the "action" attribute, and we are not on a sub-control,
            //then replace the value to write with the raw URL of the request - which ensures that we'll
            //preserve the PathInfo value on postback scenarios
            if (name == "action")
            {
                HttpContext context = HttpContext.Current;
                if (context.Items["ActionAlreadyWritten"] == null)
                {
                    //We will use the Request.RawUrl property within ASP.NET to retrieve the origional
                    //URL before it was re-written.
                    value = context.Request.RawUrl;
                    //Indicate that we've already rewritten the <form>'s action attribute to prevent
                    //us from rewriting a sub-control under the <form> control
                    context.Items["ActionAlreadyWritten"] = true;
                }
            }
            base.WriteAttribute(name, value, fEncode);
        }
    }

}

-----------------------------

在App_Browsers文件夹下创建Form.browser

<browsers>
  <browser refID="Default">
    <controlAdapters>
      <adapter controlType="System.Web.UI.HtmlControls.HtmlForm"
               adapterType="URLRewriter.Form.FormRewriterControlAdapter" />
    </controlAdapters>
  </browser>
</browsers>

--------------------------------------

这样就不需要引用ActionlessForm.dll也不需要改变Form了，只要引用URLRewriter.dll就可以了

三、在处理重写成html的时候本来网站中的html页面将会不能使用

使用以上方式将不存在找个问题

如果还不行可以在<compilation debug="true">节点下添加

<buildProviders>
        <add extension=".html" type="System.Web.Compilation.PageBuildProvider" />
</buildProviders>

在<httpHandlers>节点下添加（如果之前使用的是http处理程序执行重写的，请写在前面）

<add path="*.html" verb="*" type="System.Web.UI.PageHandlerFactory" validate="true"/>