<?xml version="1.0" encoding="utf-8"?>
<!--
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<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
    <authentication mode="Forms">
     <forms loginUrl="login.aspx"></forms>
    </authentication>
    <!--<authorization>
     <allow users="*"></allow>
    </authorization>-->
  </system.web>
</configuration>

<?xml version="1.0"?>
<configuration>
 <system.web>
 <authorization>
 <allow roles="admin" />
 <deny users="*"/>
 </authorization>
 </system.web>
</configuration>

<?xml version="1.0"?>
<configuration>
 <system.web>
 <authorization>
 <allow roles="teacher" />
 <deny users="*"/>
 </authorization>
 </system.web>
</configuration>

<?xml version="1.0"?>
<configuration>
 <system.web>
 <authorization>
 <allow roles="student" />
 <deny users="*"/>
 </authorization>
 </system.web>
</configuration>

protected void SetLoginCookie(string username, string roles)
{
System.Web.Security.FormsAuthentication.SetAuthCookie(username, false);
 System.Web.Security.FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1, username, DateTime.Now, DateTime.Now.AddDays(1), false, roles, "/");
 string hashTicket = FormsAuthentication.Encrypt(ticket);
 HttpCookie userCookie = new HttpCookie(FormsAuthentication.FormsCookieName, hashTicket);
 HttpContext.Current.Response.SetCookie(userCookie);
}

protected void Application_AuthenticateRequest(object sender, EventArgs e)
{
 HttpApplication app = (HttpApplication)sender;
 HttpContext ctx = app.Context; //獲取本次Http請求的HttpContext對象 
 if (ctx.User != null)
 {
 if (ctx.Request.IsAuthenticated == true) //驗(yàn)證過的一般用戶才能進(jìn)行角色驗(yàn)證 
 {
 System.Web.Security.FormsIdentity fi = (System.Web.Security.FormsIdentity)ctx.User.Identity;
 System.Web.Security.FormsAuthenticationTicket ticket = fi.Ticket; //取得身份驗(yàn)證票 
 string userData = ticket.UserData;//從UserData中恢復(fù)role信息
 string[] roles = userData.Split(','); //將角色數(shù)據(jù)轉(zhuǎn)成字符串?dāng)?shù)組,得到相關(guān)的角色信息 
 ctx.User = new System.Security.Principal.GenericPrincipal(fi, roles); //這樣當(dāng)前用戶就擁有角色信息了
 }
 }
}