在asp.net中实现URL Rewrite，除了IIS本身带的URL Rewrite Module以外，还有很到其他的解决方案，比如UrlRewritingNET。

UrlRewritingNET号称除了文件扩展名Rewrite需要IIS支持以外，其他所有操作都不需要IIS设置，这当然对虚拟主机的网站来说是非常便利的。

下面看看怎么来部署UrlRewritingNET：

1. 首先将下载的dll放置到bin目录

2. 修改Web.config，增加UrlRewritingNET的相关配置如下：

<?xml version="1.0"?>
<configuration>
    <configSections>
        <section name="urlrewritingnet"
                 requirePermission="false"
                 type="UrlRewritingNet.Configuration.UrlRewriteSection, UrlRewritingNet.UrlRewriter"/>
    </configSections>
    <urlrewritingnet rewriteOnlyVirtualUrls="true"
                   contextItemsPrefix="QueryString"
                     defaultProvider="RegEx"
                     xmlns="http://www.urlrewriting.net/schemas/config/2006/07">
        <rewrites>
            <add name="category"
                 virtualUrl="^~/category/(.*)"
                 rewriteUrlParameter="ExcludeFromClientQueryString"
                 destinationUrl="~/index.html?category=$1"
                 redirect="Application"
                 ignoreCase="true"/>
            <add name="book"
                 virtualUrl="^~/book/(.*),index.xml"
                 rewriteUrlParameter="ExcludeFromClientQueryString"
                 destinationUrl="~/reader.html?book=$1"
                 redirect="Application"
                 ignoreCase="true"/>
            <add name="categoryAPI"
                 virtualUrl="^~/api/category/(.*)"
                 rewriteUrlParameter="ExcludeFromClientQueryString"
                 destinationUrl="~/api/Category.ashx?path=$1"
                 ignoreCase="true"/>
            <add name="bookAPI"
                 virtualUrl="^~/api/book/(.*)"
                 rewriteUrlParameter="ExcludeFromClientQueryString"
                 destinationUrl="~/api/Book.ashx?path=$1"
                 ignoreCase="true"/>
            <add name="metaAPI"
                 virtualUrl="^~/api/meta/(.*)"
                 rewriteUrlParameter="ExcludeFromClientQueryString"
                 destinationUrl="~/api/Meta.ashx?path=$1"
                 ignoreCase="true"/>                
        </rewrites>
    </urlrewritingnet>
    <system.web>
        <httpModules>
            <add name="UrlRewriteModule" type="UrlRewritingNet.Web.UrlRewriteModule, UrlRewritingNet.UrlRewriter"/>
        </httpModules>
    </system.web>
</configuration>

3. 嵌入Rewrite规则，在<rewrites>中。virtualUrl是正则表达式的虚拟URL，destinationUrl是目标的URL。如果表明redirect，则UrlRewritingNET会通过HTTP 301，302重定位，浏览器显示的网址会有所变化

4. 需要注意的是，需要添加Global.asax，UrlRewritingNET才会生效