ASP.NET Forms身份认证

asp.net程序开发，用户根据角色访问对应页面以及功能。

项目结构如下图：

根目录 Web.config 代码：

<?xml version="1.0" encoding="utf-8"?>
<!--
  有关如何配置 ASP.NET 应用程序的详细消息，请访问
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<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>

admin文件夹中 Web.config 代码：

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

teacher文件夹中 Web.config 代码：

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

student文件夹中 Web.config 代码：

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

Login.aspx中登录成功后设置Cookie，设置Cookie代码：

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);
}

Global.asax 中进行身份验证：

protected void Application_AuthenticateRequest(object sender, EventArgs e)
{
    HttpApplication app = (HttpApplication)sender;
    HttpContext ctx = app.Context; //获取本次Http请求的HttpContext对象  
    if (ctx.User != null)
    {
        if (ctx.Request.IsAuthenticated == true) //验证过的一般用户才能进行角色验证  
        {
            System.Web.Security.FormsIdentity fi = (System.Web.Security.FormsIdentity)ctx.User.Identity;
            System.Web.Security.FormsAuthenticationTicket ticket = fi.Ticket; //取得身份验证票  
            string userData = ticket.UserData;//从UserData中恢复role信息
            string[] roles = userData.Split(','); //将角色数据转成字符串数组,得到相关的角色信息  
            ctx.User = new System.Security.Principal.GenericPrincipal(fi, roles); //这样当前用户就拥有角色信息了
        }
    }
}