這幾天在用MVC做一個項目，用到了HttpContext.User.IsInRole() 這個方法，但是每次當我用的時候，HttpContext.User.IsInRole(“Admin”)?返回的永遠是false。 在網上查了很多資料，發現都沒有解決，要解決的話，也要實現一系列的擴展方法。好，廢話少說，正式進入主題：

權限判斷

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
{
…….
}

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
{
??…….
}

上面的代碼中HttpContext.User.IsInRole(“Admin”) 返回的是false。我們要返回True怎么辦？

在Global.asax中添加以下方法：

/// <summary>
/// Authen right for user
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>

給登陸用戶賦權限
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);
}
}
}
}

///?<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，進入你的登錄頁面,給當前用戶授權。請看：

LogOn

[HttpPost]
public ActionResult LogOn(LogOnModel model, string returnUrl)
{
if (ModelState.IsValid)
{
if(ValidateUser(model.UserName, model.Password)))
{

//給登陸成功用戶賦于指定權限
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);
}

[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，直到這里，所有的問題，已經解決了。如果大家有其他的好的方法，可以分享,?歡迎留言指正?:)

轉載于:https://www.cnblogs.com/sjqq/p/7365938.html

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