ASP.NET MVC 中使用 HttpModule 来响应或动态改变静态文件

public class HtmlHttpModule : IHttpModule
{
public void Dispose()
{

}

public void Init(HttpApplication context)
{
context.BeginRequest += new EventHandler(context_BeginRequest);
context.EndRequest += new EventHandler(context_EndRequest);
}

void context_EndRequest(object sender, EventArgs e)
{
HttpApplication application = (HttpApplication)sender;
HttpContext context = application.Context;
string filePath = context.Request.FilePath;
string fileExtension = VirtualPathUtility.GetExtension(filePath);
if (fileExtension.Equals(".html") || fileExtension.Equals(".htm"))
{
//判断缓存是否存在，不存在加入缓存，调用生成静态的类和方法
//产品过期，移除静态文件，302重定向
if (System.IO.File.Exists(context.Server.MapPath(filePath)))
{
context.Response.WriteFile(context.Server.MapPath(filePath));
context.Response.End();
}
}

}

void context_BeginRequest(object sender, EventArgs e)
{
HttpApplication application = (HttpApplication)sender;
HttpContext context = application.Context;
string filePath = context.Request.FilePath;
string fileExtension = VirtualPathUtility.GetExtension(filePath);
if (fileExtension.Equals(".html") || fileExtension.Equals(".htm"))
{
context.Response.Write("<hr><h1><font color=red>" +
"HelloWorldModule: End of Request</font></h1>");
}

}
}