Validation MVC验证取决于表单元素

我正在编写一个MVC5互联网应用程序，在视图中有一个关于验证的问题

以下是我的查看代码：

<div class="form-group">
    @Html.LabelFor(model => model.asset.linkFromExternalResource, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        <div class="checkbox">
            @Html.EditorFor(model => model.asset.linkFromExternalResource)
            @Html.ValidationMessageFor(model => model.asset.linkFromExternalResource, "", new { @class = "text-danger" })
        </div>
    </div>
</div>

<div class="form-group">
    @Html.LabelFor(model => model.asset.webAddress, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.EditorFor(model => model.asset.webAddress, new { htmlAttributes = new { @class = "form-control" } })
        @Html.ValidationMessageFor(model => model.asset.webAddress, "", new { @class = "text-danger" })
    </div>
</div>

<div class="form-group">
    @Html.LabelFor(model => model.fileId, "fileId", htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.DropDownList("fileId", null, htmlAttributes: new { @class = "form-control" })
        @Html.ValidationMessageFor(model => model.fileId, "", new { @class = "text-danger" })
    </div>
</div>

与使用MVC万无一失的验证相比，编写自己的自定义验证属性更容易吗

EDIT2

我已经创建了一个testModel和一个控制器，错误仍然存在

这是我的模型：

public class TestModel
{
    [Key]
    public int Id { get; set; }
    [Required]
    public string name { get; set; }
    public bool testValue { get; set; }
    [RequiredIfTrue("testValue")]
    public string value1 { get; set; }
    [RequiredIfFalse("testValue")]

    public string value2 { get; set; }
}

这是控制器：

public ActionResult Create()
{
    return View();
}

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Create([Bind(Include = "Id,name,testValue,value1,value2")] TestModel testModel)
{
    if (ModelState.IsValid)
    {
        db.testModels.Add(testModel);
        await db.SaveChangesAsync();
        return RedirectToAction("Index");
    }

    return View(testModel);
}

public ActionResult Create（）
{
返回视图（）；
}
[HttpPost]
[ValidateAntiForgeryToken]
公共异步任务创建（[Bind（Include=“Id，name，testValue，value1，value2”）]TestModel TestModel）
{
if（ModelState.IsValid）
{
db.testModels.Add（testModel）；
等待db.saveChangesSync（）；
返回操作（“索引”）；
}
返回视图（testModel）；
}

以下是错误：

Server Error in '/' Application.

The method or operation is not implemented.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NotImplementedException: The method or operation is not implemented.

Source Error: 


Line 54:             {
Line 55:                 db.testModels.Add(testModel);
Line 56:                 await db.SaveChangesAsync();
Line 57:                 return RedirectToAction("Index");
Line 58:             }

Source File: e:\CanFindLocation\MVC\CanFindLocation\CanFindLocation\Controllers\TestModelsController.cs    Line: 56 

Stack Trace: 


[NotImplementedException: The method or operation is not implemented.]
   Foolproof.ModelAwareValidationAttribute.IsValid(Object value) +59
   System.ComponentModel.DataAnnotations.ValidationAttribute.IsValid(Object value, ValidationContext validationContext) +115
   System.ComponentModel.DataAnnotations.ValidationAttribute.GetValidationResult(Object value, ValidationContext validationContext) +29
   System.Data.Entity.Internal.Validation.ValidationAttributeValidator.Validate(EntityValidationContext entityValidationContext, InternalMemberEntry property) +198

[DbUnexpectedValidationException: An unexpected exception was thrown during validation of 'value1' when invoking Foolproof.RequiredIfTrueAttribute.IsValid. See the inner exception for details.]
   System.Data.Entity.Internal.Validation.ValidationAttributeValidator.Validate(EntityValidationContext entityValidationContext, InternalMemberEntry property) +299
   System.Data.Entity.Internal.Validation.PropertyValidator.Validate(EntityValidationContext entityValidationContext, InternalMemberEntry property) +148
   System.Data.Entity.Internal.Validation.EntityValidator.ValidateProperties(EntityValidationContext entityValidationContext, InternalPropertyEntry parentProperty, List`1 validationErrors) +203
   System.Data.Entity.Internal.Validation.TypeValidator.Validate(EntityValidationContext entityValidationContext, InternalPropertyEntry property) +105
   System.Data.Entity.Internal.Validation.EntityValidator.Validate(EntityValidationContext entityValidationContext) +55
   System.Data.Entity.Internal.InternalEntityEntry.GetValidationResult(IDictionary`2 items) +295
   System.Data.Entity.DbContext.ValidateEntity(DbEntityEntry entityEntry, IDictionary`2 items) +86
   System.Data.Entity.DbContext.GetValidationErrors() +290
   System.Data.Entity.Internal.InternalContext.SaveChangesAsync(CancellationToken cancellationToken) +150
   System.Data.Entity.Internal.LazyInternalContext.SaveChangesAsync(CancellationToken cancellationToken) +75
   System.Data.Entity.DbContext.SaveChangesAsync(CancellationToken cancellationToken) +60
   System.Data.Entity.DbContext.SaveChangesAsync() +63
   CanFindLocation.Controllers.<Create>d__7.MoveNext() in e:\CanFindLocation\MVC\CanFindLocation\CanFindLocation\Controllers\TestModelsController.cs:56
   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() +9651116
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

“/”应用程序中出现服务器错误。 未实现该方法或操作。 描述：执行当前web请求期间发生未处理的异常。请查看堆栈跟踪以了解有关错误的更多信息以及错误在代码中的起源。 异常详细信息：System.NotImplementedException:未实现该方法或操作。 源错误： 第54行：{ 第55行：db.testModels.Add（testModel）； 第56行：wait db.SaveChangesAsync（）； 第57行：返回重定向操作（“索引”）； 第58行：} 源文件：e:\CanFindLocation\MVC\CanFindLocation\CanFindLocation\Controllers\TestModelsController.cs行：56 堆栈跟踪： [NotImplementedException:未实现该方法或操作。] 万无一失的.ModelAwareValidationAttribute.IsValid（对象值）+59 System.ComponentModel.DataAnnotations.ValidationAttribute.IsValid（对象值，ValidationContext ValidationContext）+115 System.ComponentModel.DataAnnotations.ValidationAttribute.GetValidationResult（对象值，ValidationContext ValidationContext）+29 System.Data.Entity.Internal.Validation.ValidationAttributeValidator.Validate（EntityValidationContext EntityValidationContext，InternalMemberEntry属性）+198 [DbUnexpectedValidationException:在调用Stoulproof.RequiredInfrueAttribute.IsValid时验证“value1”时引发意外异常。有关详细信息，请参阅内部异常。] System.Data.Entity.Internal.Validation.ValidationAttributeValidator.Validate（EntityValidationContext EntityValidationContext，InternalMemberEntry属性）+299 System.Data.Entity.Internal.Validation.PropertyValidator.Validate（EntityValidationContext EntityValidationContext，InternalMemberEntry属性）+148 System.Data.Entity.Internal.Validation.EntityValidator.ValidateProperties（EntityValidationContext EntityValidationContext，InternalPropertyEntry parentProperty，列表'1 validationErrors）+203 System.Data.Entity.Internal.Validation.TypeValidator.Validate（EntityValidationContext EntityValidationContext，InternalPropertyEntry属性）+105 System.Data.Entity.Internal.Validation.EntityValidator.Validate（EntityValidationContext EntityValidationContext）+55 System.Data.Entity.Internal.InternalEntityEntry.GetValidationResult（IDictionary`2项）+295 System.Data.Entity.DbContext.ValidateEntity（DbEntityEntry entityEntry，IDictionary`2项）+86 System.Data.Entity.DbContext.GetValidationErrors（）+290 System.Data.Entity.Internal.InternalContext.SaveChangesSync（CancellationToken CancellationToken）+150 System.Data.Entity.Internal.LazyInternalContext.SaveChangesSync（CancellationToken CancellationToken）+75 System.Data.Entity.DbContext.SaveChangesSync（CancellationToken CancellationToken）+60 System.Data.Entity.DbContext.saveChangesSync（）+63 e:\CanFindLocation\MVC\CanFindLocation\CANFINDLOCATIONS\Controllers\TestModelsController.cs:56中的CanFindLocation.Controllers.d_u7.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 System.Threading.Tasks.TaskHelperExtensions.ThrowIfFaulted（任务）+61 System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute（IAsyncResult asyncResult）+114 System.Web.Mvc.Async.c__显示类37.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.asyncResultRapper.End（IAsyncResult asyncResult，对象标记）+102 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod（IAsyncResult asyncResult）+49 System.Web.Mvc.Async.AsyncInvocationWithFilters.b__3d（）+117 System.Web.Mvc.Async.c__DisplayClass46.b__3f（）+323 System.Web.Mvc.Async.c__显示类33.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.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2b.b__1c（）+72 System.Web.Mvc.Async.c__显示类21.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.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.WrappedAsyncRes

Server Error in '/' Application.

The method or operation is not implemented.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NotImplementedException: The method or operation is not implemented.

Source Error: 


Line 54:             {
Line 55:                 db.testModels.Add(testModel);
Line 56:                 await db.SaveChangesAsync();
Line 57:                 return RedirectToAction("Index");
Line 58:             }

Source File: e:\CanFindLocation\MVC\CanFindLocation\CanFindLocation\Controllers\TestModelsController.cs    Line: 56 

Stack Trace: 


[NotImplementedException: The method or operation is not implemented.]
   Foolproof.ModelAwareValidationAttribute.IsValid(Object value) +59
   System.ComponentModel.DataAnnotations.ValidationAttribute.IsValid(Object value, ValidationContext validationContext) +115
   System.ComponentModel.DataAnnotations.ValidationAttribute.GetValidationResult(Object value, ValidationContext validationContext) +29
   System.Data.Entity.Internal.Validation.ValidationAttributeValidator.Validate(EntityValidationContext entityValidationContext, InternalMemberEntry property) +198

[DbUnexpectedValidationException: An unexpected exception was thrown during validation of 'value1' when invoking Foolproof.RequiredIfTrueAttribute.IsValid. See the inner exception for details.]
   System.Data.Entity.Internal.Validation.ValidationAttributeValidator.Validate(EntityValidationContext entityValidationContext, InternalMemberEntry property) +299
   System.Data.Entity.Internal.Validation.PropertyValidator.Validate(EntityValidationContext entityValidationContext, InternalMemberEntry property) +148
   System.Data.Entity.Internal.Validation.EntityValidator.ValidateProperties(EntityValidationContext entityValidationContext, InternalPropertyEntry parentProperty, List`1 validationErrors) +203
   System.Data.Entity.Internal.Validation.TypeValidator.Validate(EntityValidationContext entityValidationContext, InternalPropertyEntry property) +105
   System.Data.Entity.Internal.Validation.EntityValidator.Validate(EntityValidationContext entityValidationContext) +55
   System.Data.Entity.Internal.InternalEntityEntry.GetValidationResult(IDictionary`2 items) +295
   System.Data.Entity.DbContext.ValidateEntity(DbEntityEntry entityEntry, IDictionary`2 items) +86
   System.Data.Entity.DbContext.GetValidationErrors() +290
   System.Data.Entity.Internal.InternalContext.SaveChangesAsync(CancellationToken cancellationToken) +150
   System.Data.Entity.Internal.LazyInternalContext.SaveChangesAsync(CancellationToken cancellationToken) +75
   System.Data.Entity.DbContext.SaveChangesAsync(CancellationToken cancellationToken) +60
   System.Data.Entity.DbContext.SaveChangesAsync() +63
   CanFindLocation.Controllers.<Create>d__7.MoveNext() in e:\CanFindLocation\MVC\CanFindLocation\CanFindLocation\Controllers\TestModelsController.cs:56
   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() +9651116
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155