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asp.net通过HttpModule自动在Url地址上添加参数
然而手机客户端又不支持Session和Cookie传值，其他方法给页面赋值再传值显得太麻烦了，而且还不易维护，容易弄丢出错，于是想到了用HttpModule来把cid参数赋在Url地址上，让url把cid参数每页自动传递下去，需要用cid时只要通过Requet["cid"]获取,这样就不用为传值而烦恼了。 以下是配置方法和源码。 1）在web.config配置文件中添加以下节点 复制代码 代码如下: 2）通过继承IHttpModule来实现url传值。 代码 复制代码 代码如下: using System; using System.Text; using System.Web; using System.IO; using System.Text.RegularExpressions; namespace ThreeHegemony.Utility { ///

/// Auther: Jess.zou /// Create data: 2009-08-06 /// Description: 该类作用在Url地址后自动添加(cid) ///

public class AutoAddCid : System.Web.IHttpModule { public void Init(HttpApplication context) { context.PostRequestHandlerExecute += new EventHandler(this.OnPreSendRequestContent); } protected void OnPreSendRequestContent(Object sender, EventArgs e) { System.Web.HttpApplication myContext = (System.Web.HttpApplication)sender; myContext.Response.Filter = new AppendSIDFilter(myContext.Response.Filter); } private void ReUrl_BeginRequest(object sender, EventArgs e) { string cid = ""; string url = ""; HttpContext context = ((HttpApplication)sender).Context; if (string.IsNullOrEmpty(context.Request.QueryString["cid"])) { if (context.Request.QueryString.Count == 0) { url = string.Format("{0}?cid={1}", context.Request.RawUrl, cid); } else { url = string.Format("{0}&cid={1}", context.Request.RawUrl, cid); } } context.RewritePath(url); } public void Dispose() { } public class AppendSIDFilter : Stream { private Stream Sink { get; set; } private long _position; private System.Text.StringBuilder oOutput = new StringBuilder(); public AppendSIDFilter(Stream sink) { Sink = sink; } public override bool CanRead { get { return true; } } public override bool CanSeek { get { return true; } } public override bool CanWrite { get { return true; } } public override long Length { get { return 0; } } public override long Position { get { return _position; } set { _position = value; } } public override long Seek(long offset, System.IO.SeekOrigin direction) { return Sink.Seek(offset, direction); } public override void SetLength(long length) { Sink.SetLength(length); } public override void Close() { Sink.Close(); } public override void Flush() { Sink.Flush(); } public override int Read(byte[] buffer, int offset, int count) { return Sink.Read(buffer, offset, count); } public override void Write(byte[] buffer, int offset, int count) { if (string.IsNullOrEmpty(HttpContext.Current.Request["cid"])) { Sink.Write(buffer, 0, buffer.Length); return; } string content = System.Text.UTF8Encoding.UTF8.GetString(buffer, offset, count); Regex regex = new Regex(RegexResource.HREF, RegexOptions.IgnoreCase); Regex action_regex = new Regex(RegexResource.ACTION, RegexOptions.IgnoreCase); if (regex.IsMatch(content)) { content = Regex.Replace(content, RegexResource.HREF, new MatchEvaluator(ReplaceSID), RegexOptions.Compiled | RegexOptions.IgnoreCase); } if (action_regex.IsMatch(content)) { content = Regex.Replace(content, RegexResource.ACTION, new MatchEvaluator(ReplaceSID), RegexOptions.Compiled | RegexOptions.IgnoreCase); } byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(content); Sink.Write(data, 0, data.Length); } public static string ReplaceSID(Match match) { if (match.Value.IndexOf("cid=") != -1) { return match.Value; } string result; if (match.Value.IndexOf('?') == -1) { result = match.Value.Insert(match.Value.Length - 1, "?cid=" + HttpContext.Current.Request["cid"]); } else { result = match.Value.Insert(match.Value.Length - 1, "&cid=" + HttpContext.Current.Request["cid"]); } return result; } } } }