ASP.net利用IHttpModule做判断是否登录

1.添加一个类

public class HttpModule : IHttpModule{public void Dispose(){throw new NotImplementedException();}public void Init(HttpApplication context){// throw new NotImplementedException();context.PreRequestHandlerExecute += Context_PreRequestHandlerExecute;}private void Context_PreRequestHandlerExecute(object sender, EventArgs e){// throw new NotImplementedException();//先判断是不是登陆页  （如果不是登录页{再来判断是否已经登录}）//如果是登录页（需要登录）HttpApplication app = sender as HttpApplication;//获取请求连接string path = app.Context.Request.Url.ToString();//判断这个连接当中是否包含login.aspint n = path.ToLower().LastIndexOf(\"login.aspx\");if (n==-1)  //不包含  （代表其他页面）{//判断是否已经登录if (app.Context.Session[\"usera\"]==null)//没有登录{app.Context.Response.Redirect(\"Login.aspx?src=\" + path);}}else  //代表登录页{}}}

2.在Web.config写配置文件

<!--配置文件--><system.webServer><modules><add name=\"aa\" type=\"第四节登录判断.HttpModule\"/></modules></system.webServer>

3.在登录的点击事件里写

protected void Button1_Click(object sender, EventArgs e){if (TextBox1.Text== \"12356\"){//判断是否是跳转过来的页面if (Request[\"src\"]!=null){string s = Request[\"src\"].ToLower().ToString();Session[\"usera\"] = TextBox1.Text;//跳回原来页面Response.Redirect(s);}else{Response.Redirect(\"index.aspx\");}}}