IHttpModule例子

最新推荐文章于 2016-04-18 10:24:25 发布

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最新推荐文章于 2016-04-18 10:24:25 发布

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本文链接：https://blog.youkuaiyun.com/starcrm/article/details/84969073

本文介绍了一个用于ASP.NET应用程序的自定义HTTP模块，该模块能够在请求开始时记录时间并在请求结束时输出时间，有助于性能分析。此外，还展示了一个页面(BikeInfo)如何根据URL参数动态加载自行车信息，并通过重定向处理不同的URL路径。

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// Summary description for RequestData
/// </summary>
public class RequestData : IHttpModule
{
public RequestData()
{
  //
  // TODO: Add constructor logic here
  //
}

#region IHttpModule Members

    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 httpApp = (HttpApplication)sender;
        httpApp.Response.Output.WriteLine(
            String.Format("<br>{0}", httpApp.Context.Items["requestStartTime"]));
    }

    void context_BeginRequest(object sender, EventArgs e)
    {
        HttpApplication httpApp = (HttpApplication)sender;
        httpApp.Context.Items["requestStartTime"] = DateTime.Now;
        System.Threading.Thread.Sleep(1000);
    }

#endregion
}

web.config

<system.web>
  <httpModules>
   <add name="RequestData" type="RequestData"/>
  </httpModules>

另一个例子：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Bikes_BikeInfo : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DataTable bikeList;
        int bikeInfoId;
        if (! Int32.TryParse(Request["ItemID"], out bikeInfoId))
        {
            bikeList = GetBikeList(0);
        }
        else
        {
            bikeList = GetBikeList(bikeInfoId);
        }
        Repeater1.DataSource = bikeList;
        Page.DataBind();
    }

    private DataTable GetBikeList(int id)
    {
        DataTable dt = new DataTable();
        dt.Columns.Add(new DataColumn("Link", Type.GetType("System.String")));
        dt.Columns.Add(new DataColumn("Description", Type.GetType("System.String")));
        DataRow dr;
        switch (id)
        {
            case 1: // Mountain Bikes
                dr = dt.NewRow();
                dr["Link"] = "PageDoesntExist.aspx";
                dr["Description"] = "This bike is great for beginners...";
                dt.Rows.Add(dr);
                dr = dt.NewRow();
                dr["Link"] = "PageDoesntExist.aspx";
                dr["Description"] = "Here is the bike for serious mountain bikers...";
                dt.Rows.Add(dr);
                break;
            case 2: // road bikes
                dr = dt.NewRow();
                dr["Link"] = "PageDoesntExist.aspx";
                dr["Description"] = "Beginer road bikes....";
                dt.Rows.Add(dr);
                dr = dt.NewRow();
                dr["Link"] = "PageDoesntExist.aspx";
                dr["Description"] = "When you want to fly like the wind...";
                dt.Rows.Add(dr);
                break;
             default:
                dr = dt.NewRow();
                dr["Link"] = "MountainBike.aspx";
                dr["Description"] = "See our selection of mountain bikes";
                dt.Rows.Add(dr);
                dr = dt.NewRow();
                dr["Link"] = "RoadBike.aspx";
                dr["Description"] = "See our selection of road bikes";
                dt.Rows.Add(dr);
                break;
       }
        return dt;
    }
}

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

#endregion

    void context_BeginRequest(object sender, EventArgs e)
    {
        HttpApplication app = (HttpApplication)sender;
        if (app.Request.RawUrl.ToLower().Contains("/bikes/default.aspx"))
        {
            app.Context.RewritePath("BikeInfo.aspx", "", "");
        }
        else if (app.Request.RawUrl.ToLower().Contains("/bikes/mountainbike.aspx"))
        {
            app.Context.RewritePath("BikeInfo.aspx", "", "ItemID=1");
        }
        if (app.Request.RawUrl.ToLower().Contains("/bikes/roadbike.aspx"))
        {
            app.Context.RewritePath("BikeInfo.aspx", "", "ItemID=2");
        }
    }