下面是类的定义。
代码如下:
using System;
using System.Web;
using System.Web.SessionState;
namespace QTJZ
{
public class Filters : IHttpModule, IRequiresSessionState
{
public void Dispose() { }
public void Init(HttpApplication application)
{
application.AcquireRequestState += new EventHandler(application_AcquireRequestState);
}
public void application_AcquireRequestState(object sender, EventArgs e)
{
HttpApplication application = sender as HttpApplication;
HttpRequest request = application.Request;
HttpResponse response = application.Response;
string url=request.CurrentExecutionFilePath.Trim('/');
string suffix = request.CurrentExecutionFilePathExtension.Trim('.');
if (!url.Equals("Default.htm") && (suffix == "aspx" || suffix == "htm"))
{
object sessionObj = application.Context.Session == null ? null : application.Session["useID"];
if (sessionObj==null)
{
response.Redirect("~/Default.htm");
}
}
}
}
}
为了实现过滤的效果，Filters类需要实现IHttpMoeld接口，实现该接口需要有两个方法，一个是Dispose,另一个是Init。Init的参数是一个HttpApplication类型的实例，利用这个实例注册一些事件。由于现在要对URL进行过滤，因此注册的是AcquireRequestState事件。类似事件罗列如下
| BeginRequest |
