解决HttpContext.User.IsInRole() 永远返回false的问题

这几天在用MVC做一个项目，用到了HttpContext.User.IsInRole() 这个方法，但是每次当我用的时候，HttpContext.User.IsInRole(“Admin”) 返回的永远是false。 在网上查了很多资料，发现都没有解决，要解决的话，也要实现一系列的扩展方法。好，废话少说，正式进入主题：

if (HttpContext.User.Identity == null || String.IsNullOrEmpty(HttpContext.User.Identity.Name))
 {
      return Redirect("~/Account/LogOn?returnUrl=/service");
 }
else if (HttpContext.User.IsInRole("Admin"))
  {
         return RedirectToAction("Index", "AdminService");
 }
else
{
  …….
}

上面的代码中HttpContext.User.IsInRole(“Admin”) 返回的是false。我们要返回True怎么办？

在Global.asax中添加以下方法：

/// <summary>
/// Authen right for user
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Application_AuthenticateRequest(Object sender, EventArgs e)
        {
            if (HttpContext.Current.User != null)
            {
                if (HttpContext.Current.User.Identity.IsAuthenticated)
                {
                    if (HttpContext.Current.User.Identity is FormsIdentity)
                    {
                        //Get current user identitied by forms
                        FormsIdentity id = (FormsIdentity)HttpContext.Current.User.Identity;
                        // get FormsAuthenticationTicket object
                        FormsAuthenticationTicket ticket = id.Ticket;
                        string userData = ticket.UserData;
                        string[] roles = userData.Split(',');
                        // set the new identity for current user.
                        HttpContext.Current.User = new GenericPrincipal(id, roles);
                    }
                }
            }
        }

添加好以后，进入你的登录页面,给当前用户授权。请看：

[HttpPost]
public ActionResult LogOn(LogOnModel model, string returnUrl)
{
   if (ModelState.IsValid)
   {
     if(ValidateUser(model.UserName, model.Password)))
     {
 UserInfo userInfo = GetuserInfo(model.UserName);
if (userInfo.Role =="Admin")                    {
    role = "Admin";
}
FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket(1,
                        userInfo.Alias,
                        DateTime.Now,
                        DateTime.Now.AddMinutes(30),
                        false,
                        role);
                    string encTicket = FormsAuthentication.Encrypt(authTicket);
                    this.Response.Cookies.Add(new HttpCookie(FormsAuthentication.FormsCookieName,encTicket));

                  //  FormsAuthentication.SetAuthCookie(model.UserName, model.RememberMe);
                    if (Url.IsLocalUrl(returnUrl) && returnUrl.Length > 1 && returnUrl.StartsWith("/")
                        && !returnUrl.StartsWith("//") && !returnUrl.StartsWith("/\\"))
                    {
                        return Redirect(returnUrl);
                    }
                    else
                    {
                        return RedirectToAction("Index", "Home");
                    }
                }
                else
                {
                    ModelState.AddModelError("", "The user name or password provided is incorrect.");
                }
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }

 好了，直到这里，所有的问题，已经解决了。如果大家有其他的好的方法，可以分享, 欢迎留言指正 :)