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我正在编写一个 MVC 5 互联网应用程序，并且对视图中的验证有疑问。

这是我的视图代码：

<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>

我如何编写代码来验证model.asset.webAddress或model.fileId取决于是否model.asset.linkFromExternalResource检查？

我会尝试更好地解释这一点。如果用户选中了model.asset.linkFromExternalResource复选框，则将model.asset.webAddress验证该值，但不验证model.fileId该复选框；如果model.asset.linkFromExternalResource未选中该复选框，则将model.asset.webAddress不验证该值，但model.fileId将验证该值。

我应该如何处理这种情况？我是在视图中还是在控制器中编写此代码？

编辑

我已添加MVC Foolproof Validation但收到以下错误：

[NotImplementedException：方法或操作未实现。]

在这行代码：

await db.SaveChangesAsync();

而不是使用MVC Foolproof Validation，编写我自己的自定义验证属性更容易吗？

编辑2

我创建了一个 testModel 和一个控制器，但错误仍然存​​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);
}

这是错误：

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
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