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值不能为空。参数名：价值，CreateIdentityAsync？

本文介绍了值不能为空。参数名：价值，CreateIdentityAsync？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我创建一个视图模型（的usermodel ）的实施 IUSER＆LT;＆GT INT; （自定义ASP.NET身份2.0 ）

I created a ViewModel(UserModel) that implement IUser<int> (for customizing ASP.NET Identity 2.0)

public class UserModel : IUser<int>
{
    public int Id { get; set; }

    public string SecurityStamp { get; set; }

    [Display(Name = "Name")]
    public string FirstName { get; set; }

    [Display(Name = "Last Name")]
    public string LastName { get; set; }

    public string FullName { get; set; }

    [Display(Name = "Username")]
    public string UserName { get; set; }

    [DataType(DataType.Password)]
    [Display(Name = "Password")]
    public string Password { get; set; }

    [Display(Name = "E-Mail")]
    public string Email { get; set; }

    [Display(Name = "Photo")]
    public string PhotoPath { get; set; }

    public List<Claim> Claims { get; set; }

    [IgnoreMapping]
    public List<CommentModel> Comments { get; set; }
}

一切都很好，但 GenerateUserIdentityAsync 方法。

下面code是我的 GenerateUserIdentityAsync 中的usermodel：

Everything is well, but GenerateUserIdentityAsync method.
The following code is my GenerateUserIdentityAsync in UserModel:

public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<UserModel, int> manager)
{
    this.SecurityStamp = Guid.NewGuid().ToString();
    this.Claims = new List<Claim>();

    ClaimsIdentity userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);//Exception : Value cannot be null. Parameter name: value

    return userIdentity;
}

这是例外发生在 CreateIdentityAsync 方法，以下堆栈跟踪

An exception has occurred in CreateIdentityAsync method with the following stack trace

ArgumentNullException: Value cannot be null.
Parameter name: value]
   System.Security.Claims.Claim..ctor(String type, String value, String valueType, String issuer, String originalIssuer, ClaimsIdentity subject, String propertyKey, String propertyValue) +10798181
   System.Security.Claims.Claim..ctor(String type, String value) +34
   Microsoft.AspNet.Identity.<CreateAsync>d__0.MoveNext() +1458
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() +24
   Smartiz.UI.Models.<GenerateUserIdentityAsync>d__2.MoveNext() in e:\Works\Smartiz\Smartiz.UI\Models\UserModels.cs:215
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() +24
   Smartiz.UI.Controllers.<SignInAsync>d__58.MoveNext() in e:\Works\Smartiz\Smartiz.UI\Controllers\AccountController.cs:448
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +21
   Smartiz.UI.Controllers.<ExternalLoginCallback>d__3c.MoveNext() in e:\Works\Smartiz\Smartiz.UI\Controllers\AccountController.cs:315
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +21
   System.Threading.Tasks.TaskHelpersExtensions.ThrowIfFaulted(Task task) +61
   System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +114
   System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeAsynchronousActionMethod>b__36(IAsyncResult asyncResult) +66
   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__3d() +117
   System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +323
   System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(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__DisplayClass2b.<BeginInvokeAction>b__1c() +72
   System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(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__5(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() +9651188
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

能否请你指导我在我的错是什么？

Could you please guide me where my wrong is ?

推荐答案

我面临着同样的问题，而从ASP.NET身份1升级到ASP.NET身份2，我通过把一个随机字符串在该领域SecurityStamp解决它。

I faced the same issue while upgrading from ASP.NET Identity 1 to ASP.NET Identity 2 and I solved it by putting a random string in the field SecurityStamp.

我发现这个解决方案<一个href=\"http://forums.asp.net/t/1982978.aspx?Microsoft+AspNet+UserManager+is+there+a+synchronous+version+of+CreateAsync+how+do+I+add+multiple+users+in+a+single+shot+\">here.

我希望它为你工作了。

这篇关于值不能为空。参数名：价值，CreateIdentityAsync？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

08-28 04:57
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