Question

我是MVC的新手，如果这是一个简单的问题，请道歉，但我用Google搜索并找不到答案。

我正在使用谷歌提供商的ASP.NET身份，这工作正常，但我想检查数据库中是否存在该用户，并且只允许在ExternalLoginCallback上使用userinfo的用户。

这是我修改过的函数代码：

'
' GET: /Account/ExternalLoginCallback
<AllowAnonymous>
Public Async Function ExternalLoginCallback(returnUrl As String) As Task(Of ActionResult)
    Dim loginInfo = Await AuthenticationManager.GetExternalLoginInfoAsync()
    If loginInfo Is Nothing Then
        Return RedirectToAction("Login")
    End If

    ' Sign in the user with this external login provider if the user already has a login
    Dim result = Await SignInManager.ExternalSignInAsync(loginInfo, isPersistent := False)
    Select Case result
        Case SignInStatus.Success
            Return RedirectToLocal(returnUrl)
        Case SignInStatus.LockedOut
            Return View("Lockout")
        Case SignInStatus.RequiresVerification
            Return RedirectToAction("SendCode", New With {
                .ReturnUrl = returnUrl,
                .RememberMe = False
            })
        Case Else

            'check first if the user has an account set up with this provider email.

            Dim uid = Await UserManager.FindByEmailAsync(loginInfo.Email)
            If uid IsNot Nothing Then
                If uid.Id <> "" Then
                    Dim result1 = Await UserManager.AddLoginAsync(uid.Id, loginInfo.Login)
                    If result1.Succeeded Then
                        Await SignInManager.SignInAsync(uid, isPersistent:=False, rememberBrowser:=False)
                        ViewBag.ReturnUrl = returnUrl
                        Return RedirectToLocal(returnUrl)
                    End If
                End If
            End If

            Dim errmsg As String = "You are not authorised to use this account"
            ModelState.AddModelError("", errmsg)
            Return RedirectToAction("Login")

                    End Select
End Function

此代码的工作原理是它将用户重定向回登录页面，但我想添加一个自定义错误，您可以从代码中看到。登录视图有一个 @ Html.ValidationSummary（True，＆＃34;＆＃34;，New With {.class =＆＃34; text-danger＆＃34;}）

但我认为我的代码只适用于当前的模型＆＃34; ExternalLoginConfirmation＆＃34;。如何在日志视图中获得此自定义错误？

Answer 1

感谢@StephenMuecke和@TheUnknown的精彩快速反应，我解决了这个问题。

我替换了

ModelState.AddModelError("", errmsg)

带

TempData("loginError") = errmsg

然后在登录操作中，我添加了：

Dim errorresult = TempData("loginError")
    If errorresult IsNot Nothing Then
        If errorresult <> "" Then
            ViewBag.ErrorResult = errorresult
        End If
    End If

然后在行后的Login.vbhtml中：

@Html.Partial("_ExternalLoginsListPartial", New ExternalLoginListViewModel With {.ReturnUrl = ViewBag.ReturnUrl})

我添加了

<p class="text-danger">@ViewBag.ErrorResult</p>

它现在完美无缺。

ASP.NET MVC返回登录的自定义错误

1 个答案: