Asp.net mvc MVC5:Google登录失败

我使用VS2K13（在Windows8.1 X64上）中的web向导生成了一个新的MVC5应用程序，并为该项目启用了Facebook和Google登录。在我的测试中，只有Facebook登录有效，而谷歌一直失败。我认为Microsoft.Owin中有一个bug

我在Asp.net上问了同样的问题，到目前为止还没有得到有效的答案。似乎没有人知道asp.net上的错误是什么

以下是调试输出：

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 


Line 197:        public async Task<ActionResult> ExternalLoginCallback(string returnUrl)
Line 198:        {
Line 199:            var loginInfo = await AuthenticationManager.GetExternalLoginInfoAsync();
Line 200:            if (loginInfo == null)
Line 201:            {


 Source File:  c:\downloads\web\projects\TestMvc5\TestMvc5\Controllers\AccountController.cs    Line:  199 

Stack Trace: 



[NullReferenceException: Object reference not set to an instance of an object.]
   Microsoft.Owin.Security.AuthenticationManagerExtensions.GetExternalLoginInfo(AuthenticateResult result) +189
   Microsoft.Owin.Security.<GetExternalLoginInfoAsync>d__7.MoveNext() +362
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() +24
   TestMvc5.Controllers.<ExternalLoginCallback>d__25.MoveNext() in c:\downloads\web\projects\TestMvc5\TestMvc5\Controllers\AccountController.cs:199
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +21
   lambda_method(Closure , Task ) +64
   System.Threading.Tasks.TaskHelpersExtensions.ThrowIfFaulted(Task task) +37
   System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +114
   System.Web.Mvc.Async.<>c__DisplayClass34.<BeginInvokeAsynchronousActionMethod>b__33(IAsyncResult asyncResult) +65
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +47
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +136
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +49
   System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3c() +117
   System.Web.Mvc.Async.<>c__DisplayClass45.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3e() +323
   System.Web.Mvc.Async.<>c__DisplayClass30.<BeginInvokeActionMethodWithFilters>b__2f(IAsyncResult asyncResult) +44
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +47
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +136
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +50
   System.Web.Mvc.Async.<>c__DisplayClass28.<BeginInvokeAction>b__19() +72
   System.Web.Mvc.Async.<>c__DisplayClass1e.<BeginInvokeAction>b__1b(IAsyncResult asyncResult) +185
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +133
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +40
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +34
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +70
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +44
   System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +39
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +62
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +39
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +39
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__4(IAsyncResult asyncResult, ProcessRequestState innerState) +39
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +70
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +40
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9688704
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

异常详细信息：System.NullReferenceException:对象引用未设置为对象的实例。
源错误：
第197行：公共异步任务ExternalLoginCallback（字符串返回URL）
第198行：{
第199行：var loginInfo=await AuthenticationManager.GetExternalLoginInfoAsync（）；
第200行：if（loginInfo==null）
第201行：{
源文件：c:\downloads\web\projects\TestMvc5\TestMvc5\Controllers\AccountController.cs行：199
堆栈跟踪：
[NullReferenceException:对象引用未设置为对象的实例。]
Microsoft.Owin.Security.AuthenticationManagerExtensions.GetExternalLoginInfo（AuthenticateResult结果）+189
Microsoft.Owin.Security.d__7.MoveNext（）+362
System.Runtime.CompilerServices.TaskWaiter.ThrowForNonSuccess（任务任务）+93
System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）+52
System.Runtime.CompilerServices.TaskWaiter`1.GetResult（）+24
c:\downloads\web\projects\TestMvc5\TestMvc5\Controllers\AccountController.cs:199中的TestMvc5.Controllers.d_u25.MoveNext（）
System.Runtime.CompilerServices.TaskWaiter.ThrowForNonSuccess（任务任务）+93
System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务）+52
System.Runtime.CompilerServices.TaskWaiter.GetResult（）+21
lambda_方法（闭包，任务）+64
System.Threading.Tasks.TaskHelperExtensions.ThrowIfFaulted（任务）+37
System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute（IAsyncResult asyncResult）+114
System.Web.Mvc.Async.c__显示类34.b__33（IAsyncResult asyncResult）+65
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate（IAsyncResult asyncResult）+47
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End（）+136
System.Web.Mvc.Async.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+102
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod（IAsyncResult asyncResult）+49
System.Web.Mvc.Async.AsyncInvocationWithFilters.b__3c（）+117
System.Web.Mvc.Async.c__显示类45.b_3e（）+323
System.Web.Mvc.Async.c__显示类30.b__2f（IAsyncResult asyncResult）+44
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate（IAsyncResult asyncResult）+47
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End（）+136
System.Web.Mvc.Async.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+102
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters（IAsyncResult asyncResult）+50
System.Web.Mvc.Async.c__显示类28.b__19（）+72
System.Web.Mvc.Async.c__显示Class1E.b__1b（IAsyncResult asyncResult）+185
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate（IAsyncResult asyncResult）+42
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End（）+133
System.Web.Mvc.Async.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+56
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction（IAsyncResult asyncResult）+40
System.Web.Mvc.Controller.b_u1d（IAsyncResult asyncResult，ExecuteCorerate innerState）+34
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate（IAsyncResult asyncResult）+70
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End（）+139
System.Web.Mvc.Async.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+59
System.Web.Mvc.Async.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+40
System.Web.Mvc.Controller.EndExecuteCore（IAsyncResult asyncResult）+44
System.Web.Mvc.Controller.b_uu15（IAsyncResult asyncResult，Controller-Controller）+39
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate（IAsyncResult asyncResult）+62
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End（）+139
System.Web.Mvc.Async.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+59
System.Web.Mvc.Async.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+40
System.Web.Mvc.Controller.EndExecute（IAsyncResult asyncResult）+39
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute（IAsyncResult asyncResult）+39
System.Web.Mvc.MvcHandler.b_uu4（IAsyncResult asyncResult，ProcessRequestState innerState）+39
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate（IAsyncResult asyncResult）+70
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End（）+139
System.Web.Mvc.Async.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+59
System.Web.Mvc.Async.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+40
System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult）+40
System.Web.Mvc.MvcHandler.System.Web.IHTTPassynchandler.EndProcessRequest（IAsyncResult结果）+38
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（）+9688704
System.Web.HttpApplication.ExecuteStep（IExecutionStep步骤，布尔值&同步完成）+155

我们也有同样的问题。我们确实发现，只有当用户没有定义firstname和lastname时，才会发生这种情况。一旦用户定义了firstname和lastname，则不会发生错误。如果您找到解决方法，我们将非常感谢您发布答案。

谢谢您的评论。您已经找到问题的原因。我将报告错误微软。