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注意：该BaseModuleRewriter类将网址重写放在AuthorizeRequest事件中调用，如果要使用Windows验证并使用文件验证模式时请修改代码将网址授权放在BeginRequest或者AuthenticateRequest事件中。
ModuleRewriter继承自BaseModuleRewriter，并真正意义地实现了网址重写的操作，该类仅包含一个重载了的方法Rewrite()，其内容如下文所示：
protected override void Rewrite(string requestedPath, System.Web.HttpApplication app)
{
// get the configuration rules
RewriterRuleCollection rules = RewriterConfiguration.GetConfig().Rules;
// iterate through each rule
for(int i = 0; i < rules.Count; i++)
{
// get the pattern to look for, and
// Resolve the Url (convert ~ into the appropriate directory)
string lookFor = "^" +
RewriterUtils.ResolveUrl(app.Context.Request.ApplicationPath, rules[i].LookFor) + "$";
// Create a regex (note that IgnoreCase is set)
Regex re = new Regex(lookFor, RegexOptions.IgnoreCase);
// See if a match is found
if (re.IsMatch(requestedPath))
{
// match found - do any replacement needed
string sendToUrl = RewriterUtils.ResolveUrl(app.Context.Request.ApplicationPath, re.Replace(requestedPath, rules[i].SendTo));
// Rewrite the URL
RewriterUtils.RewriteUrl(app.Context, sendToUrl);
break; // exit the for loop
}
}
}
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