2017-10-21 137 views
1

每當我連接流暢的驗證到我的asp.net核心mvc應用程序我開始得到NullReferenceException,我已經遵循github上的asp.net核心的集成指南,但我可以不知道失敗的地方。波紋管是我的模型類的驗證和服務配置NullReferenceException當使用Fluent驗證ASP.NET核心

公共無效ConfigureServices(IServiceCollection服務) {

var appSettings = Configuration.GetSection("AppSettings"); 
    services.Configure<AppSettings>(appSettings); 


    #region FluentValidation 
    services.AddTransient<IValidator<ContactFormModel>, ContactFormValidator>(); 
    services.AddTransient<IValidator<BookingSearchViewModel>, BookingSearchModelValidator>(); 
    services.AddTransient<IValidator<BookingCarSelectionViewModel>, BookingCarSelectionValidator>(); 
    services.AddTransient<IValidator<BookingClientDataModel>, BookingClientDataValidator>(); 
    #endregion 


    services.AddMvc().AddFluentValidation(); 
    services.AddAutoMapper(typeof(Startup));  
} 

我的模型類,並驗證

public class BookingSearchViewModel 
    { 
    [Display(Name ="Fecha de Recogida")] 
    public DateTime? PickupDate { get; set; } 

    [Display(Name = "Fecha de Entrega")] 
    public DateTime? DropoffDate { get; set; } 

    [Display(Name = "Transmisión")] 
    public CarTransmissionEnum Transmission { get; set; } 

    public List<SelectListItem> transmissionOptions { get; set; } 

    public BookingSearchViewModel() 
    { 

     var list = new List<string> 
     { 
     "Manual", 
     "Automatico" 
     }; 

     this.transmissionOptions = new List<SelectListItem> { 
     new SelectListItem 
     { 
      Text="Manual" 
     }, 
     new SelectListItem 
     { 
      Text="Automatico" 
     } 
     }; 
    } 

    } 
    public class BookingSearchModelValidator : AbstractValidator<BookingSearchViewModel> 
    { 
    public BookingSearchModelValidator() 
    { 
     RuleFor(x => x.PickupDate).NotNull().GreaterThan(DateTime.Now).Must(FiveDaysFromToday); 
     RuleFor(x => x.DropoffDate).NotNull().GreaterThan(x => x.PickupDate).Must((form, countyId) => BeAValidRange(form.PickupDate, form.DropoffDate)); 
     RuleFor(x => x.Transmission).IsInEnum(); 
    } 

    private bool FiveDaysFromToday(DateTime? pickupDate) 
    { 
     if (pickupDate.HasValue) 
     { 
     var today = DateTimeOffset.UtcNow.Date.ToCST().DateTime; 
     var days = pickupDate.Value.Date.ToCST().Subtract(today).Days; 
     return days > 3; 
     } 
     return false; 
    } 

    private bool BeAValidRange(DateTimeOffset? pickupDate, DateTimeOffset? dropoffDate) 
    { 
     if (pickupDate.HasValue && dropoffDate.HasValue) 
     { 
     var days = dropoffDate.Value.Subtract(pickupDate.Value).Days; 
     if (days > 2 && days < 29) 
      return true; 
     } 
     return false; 
    } 

    } 

這是堆棧跟蹤

NullReferenceException: Object reference not set to an instance of an object. 
FluentValidation.AspNetCore.FluentValidationClientModelValidatorProvider.CreateValidators(ClientValidatorProviderContext context) 
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.CompositeClientModelValidatorProvider.CreateValidators(ClientValidatorProviderContext context) 
Microsoft.AspNetCore.Mvc.Internal.ClientValidatorCache.GetValidators(ModelMetadata metadata, IClientModelValidatorProvider validatorProvider) 
Microsoft.AspNetCore.Mvc.ViewFeatures.DefaultValidationHtmlAttributeProvider.AddValidationAttributes(ViewContext viewContext, ModelExplorer modelExplorer, IDictionary<string, string> attributes) 
Microsoft.AspNetCore.Mvc.ViewFeatures.ValidationHtmlAttributeProvider.AddAndTrackValidationAttributes(ViewContext viewContext, ModelExplorer modelExplorer, string expression, IDictionary<string, string> attributes) 
Microsoft.AspNetCore.Mvc.ViewFeatures.DefaultHtmlGenerator.AddValidationAttributes(ViewContext viewContext, TagBuilder tagBuilder, ModelExplorer modelExplorer, string expression) 
Microsoft.AspNetCore.Mvc.ViewFeatures.DefaultHtmlGenerator.GenerateInput(ViewContext viewContext, InputType inputType, ModelExplorer modelExplorer, string expression, object value, bool useViewData, bool isChecked, bool setId, bool isExplicitValue, string format, IDictionary<string, object> htmlAttributes) 
Microsoft.AspNetCore.Mvc.ViewFeatures.DefaultHtmlGenerator.GenerateTextBox(ViewContext viewContext, ModelExplorer modelExplorer, string expression, object value, string format, object htmlAttributes) 
Microsoft.AspNetCore.Mvc.TagHelpers.InputTagHelper.GenerateTextBox(ModelExplorer modelExplorer, string inputTypeHint, string inputType) 
Microsoft.AspNetCore.Mvc.TagHelpers.InputTagHelper.Process(TagHelperContext context, TagHelperOutput output) 
Microsoft.AspNetCore.Razor.TagHelpers.TagHelper.ProcessAsync(TagHelperContext context, TagHelperOutput output) 
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner+<RunAsync>d__0.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.GetResult() 
AspNetCore._Views_Home_Index_cshtml+<<ExecuteAsync>b__39_7>d.MoveNext() in Index.cshtml 
+ 
        <input asp-for="PickupDate" class="form-control" placeholder="mm/dd/yyyy" required type="text" /> 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext+<GetChildContentAsync>d__31.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.TagHelpers.RenderAtEndOfFormTagHelper+<ProcessAsync>d__7.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner+<RunAsync>d__0.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.GetResult() 
AspNetCore._Views_Home_Index_cshtml+<ExecuteAsync>d__39.MoveNext() in Index.cshtml 
+ 
    var pixelImage = appSettings.Value.PixelImage; 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderPageCoreAsync>d__16.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderPageAsync>d__15.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.Razor.RazorView+<RenderAsync>d__14.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor+<ExecuteAsync>d__22.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor+<ExecuteAsync>d__21.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.ViewResult+<ExecuteResultAsync>d__26.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeResultAsync>d__19.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeNextResultFilterAsync>d__24.MoveNext() 
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResultExecutedContext context) 
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted) 
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeNextResourceFilter>d__22.MoveNext() 
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context) 
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted) 
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeFilterPipelineAsync>d__17.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeAsync>d__15.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Builder.RouterMiddleware+<Invoke>d__4.MoveNext() 
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware+<Invoke>d__7.MoveNext() 

這是我的「M執行視圖

public IActionResult Index() 
    { 
     var model = new BookingSearchViewModel(); 
     return View(model); 
    } 

我試過在模型中移除空的屬性,初始化它們,去掉驗證規則,但我仍然得到同樣的錯誤,我使用FluentValidation.AspNetCore V7.2.0。

我該如何解決這個空例外?

**編輯:

不是重複,是關係到流利的驗證和我的猜測注射流利驗證到asp.net核心當異常發生的事情,沒有我的機型是空的,去除AddFluentValidation( )從服務中刪除錯誤,但我就不能使用流利的驗證沒有更多的**

感謝

+1

的[?什麼是一個NullReferenceException,以及如何解決呢(https://stackoverflow.com/questions/可能的複製4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) –

+0

不是重複的,與Fluent Validation相關,我猜這個異常是在將注入Fluent驗證到asp.net核心時發生的,沒有我的模型是空的,從服務中刪除AddFluentValidation()刪除錯誤,但我不能使用流利的驗證沒有更多 –

回答

0

不知道,如果你需要對特定的應用程序客戶端驗證,但我設法通過排序此禁用客戶端驗證(閱讀fluentvalidation問題日誌here

我在啓動使用的代碼是: -

services.AddMvc().AddFluentValidation(fv => 
{  
    fv.ConfigureClientsideValidation(enabled: false); 
}); 
+0

嗨,這是已經在github報道? – dpp

+0

抱歉,我不確定,我提供的鏈接是其他人在更新到7.2.0版本後遇到的問題。目前尚不清楚這種「修復」是否是配置FV的新方式(它聽起來像)或者僅僅是一些設置來阻止一些人遇到的問題...... – padigan

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