mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Validation/ForegroundValidationSynchronizer.cs

   1 // <copyright>
   2 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   3 // </copyright>
   4
   5 namespace System.Activities.Presentation.Validation
   6 {
   7     using System.Activities.Validation;
   8     using System.Runtime;
   9     using System.Threading;
  10     using System.Windows.Threading;
  11
  12     internal sealed class ForegroundValidationSynchronizer<TValidationResult> : ValidationSynchronizer
  13     {
  14         private TaskDispatcher dispatcher;
  15         private Func<ValidationReason, CancellationToken, TValidationResult> validationWork;
  16         private Action<TValidationResult> updateWork;
  17
  18         internal ForegroundValidationSynchronizer(TaskDispatcher dispatcher, Func<ValidationReason, CancellationToken, TValidationResult> validationWork, Action<TValidationResult> updateWork)
  19         {
  20             Fx.Assert(dispatcher != null, "dispatcher should not be null and is ensured by caller.");
  21             Fx.Assert(validationWork != null, "validationWork should not be null and is ensured by caller.");
  22             Fx.Assert(updateWork != null, "updateWork should not be null and is ensured by caller.");
  23
  24             this.dispatcher = dispatcher;
  25             this.validationWork = validationWork;
  26             this.updateWork = updateWork;
  27         }
  28
  29         internal override void Validate(ValidationReason reason)
  30         {
  31             this.updateWork(this.validationWork(reason, /* cancellationToken = */ CancellationToken.None));
  32         }
  33
  34         internal override void DeactivateValidation()
  35         {
  36             // no-op, we do not need to synchronize change since validation is executing on UI thread.
  37         }
  38
  39         internal override void ActivateValidation()
  40         {
  41             // no-op, we do not need to synchronize change since validation is executing on UI thread.
  42         }
  43     }
  44 }