如何利用HttpModule修改文件内容

[cnw168]

context.PreSendRequestContent += new EventHandler(this.fanghuoqing);

PreSendRequestContent 在ASP.NET把响应内容发送到客户端之前引发这个事件。这个事件允许我们在内容到达客户端之前改变响应内容。我们可以使用这个事件给页面输出添加用于所有页面的内容。例如通用菜单、头信息或脚信息。

资料上是这么说的但没有说具体方法.使用content.Response.Write到是可以统一添加内容,但只能是在输出内容的下面添加.

我想对输出的内容进行修改,比如替换一些文字,或将输出内容保存到硬盘上.但是在PreSendRequestContent 中不知道该如何读取输入内容.请指点.

[别样苍茫]

using System;
using System.Web;

namespace xumh
{
    /// <summary>
    /// 多个HttpModule的应用示例：
    /// web.config文件中HttpModules里面先Add哪一个他就先执行，按add的顺序分别执行
    /// 多个HttpModule要过滤的事件会分别处理
    /// </summary>
    public class multiHttpModule : IHttpModule
    {
        public void Dispose()
        {
            throw new NotImplementedException();
        }

        public void Init(HttpApplication context)
        {//重新定义ASP.NET的事件处理程序
            context.BeginRequest += new EventHandler(myBeginRequest);
            context.EndRequest += new EventHandler(myEndRequest);
            context.PreRequestHandlerExecute += new EventHandler(myPreRequestHandlerExecute);
            context.PostRequestHandlerExecute += new EventHandler(myPostRequestHandlerExecute);
            context.ReleaseRequestState += new EventHandler(myReleaseRequestState);
            context.AcquireRequestState += new EventHandler(myAcquireRequestState);
            context.AuthenticateRequest += new EventHandler(myAuthenticateRequest);
            context.AuthorizeRequest += new EventHandler(myAuthorizeRequest);
            context.ResolveRequestCache += new EventHandler(myResolveRequestCache);
            context.PreSendRequestHeaders += new EventHandler(myPreSendRequestHeaders);
            context.PreSendRequestContent += new EventHandler(myPreSendRequestContent);
        
        }

        void myPreSendRequestContent(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("myPreSendRequestContent<br/>");
        }

        void myPreSendRequestHeaders(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("myPreSendRequestHeaders<br/>");
        }

        void myResolveRequestCache(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("myResolveRequestCache<br/>");
        }

        void myAuthorizeRequest(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("BeginRequest<br/>");
        }

        void myAuthenticateRequest(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("BeginRequest<br/>");
        }

        void myAcquireRequestState(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("myAcquireRequestState<br/>");
        }

        void myReleaseRequestState(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("myReleaseRequestState<br/>");
        }

        void myPostRequestHandlerExecute(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("myPostRequestHandlerExecute<br/>");
        }

        void myPreRequestHandlerExecute(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("myPreRequestHandlerExecute<br/>");
        }

        void myEndRequest(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("myEndRequest<br/>");
        }

        void myBeginRequest(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            context.Response.Write("multiHttpModules:myBeginRequest<br/>");
        }

    }
}
/*--===------------------------------------------===---
输出结果：
 testHttpModule:myBeginRequest
multiHttpModules:myBeginRequest
BeginRequest
BeginRequest
myResolveRequestCache
myAcquireRequestState
myPreRequestHandlerExecute

 
myPostRequestHandlerExecute
myReleaseRequestState
myEndRequest
myPreSendRequestHeaders
--===------------------------------------------===---*/

[wuyq11]

public void Init(HttpApplication context)
{
context.PreSendRequestContent += new EventHandler(context_PreRequestHandlerExecute);
}

void context_PreRequestHandlerExecute(object sender, EventArgs e)
{
HttpApplication app = (HttpApplication)sender;
HttpContext context = app.Context;
string url = context.Request.RawUrl;
}
直接StringWriter wr = new StringWriter();
Server.Execute("", wr);
this.lit.Text = Server.HtmlEncode(wr.ToString());
File.WriteAllText(Server.MapPath(""), wr.ToString());

[newdigitime]

重载 render()事件处理程序就可以满足你的要求.

其它一些要求,譬如头信息,完全可以放一个服务器控件,然后用代码赋值.

当然你用自定义httpmodule模块也可以.
方法如楼上,继承 IHttpModule