mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Expressions/ExpressionMorphHelperAttribute.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.Expressions
   6 {
   7     using System.Runtime;
   8     using System.Diagnostics.CodeAnalysis;
   9     using System.Globalization;
  10
  11     [Fx.Tag.XamlVisible(false)]
  12     [AttributeUsage(AttributeTargets.Class)]
  13     public sealed class ExpressionMorphHelperAttribute : Attribute
  14     {
  15         Type helperType;
  16
  17         public ExpressionMorphHelperAttribute(Type expressionMorphHelperType)
  18         {
  19             if (typeof(ExpressionMorphHelper).IsAssignableFrom(expressionMorphHelperType))
  20             {
  21                 this.helperType = expressionMorphHelperType;
  22             }
  23             else
  24             {
  25                 throw FxTrace.Exception.AsError(new ArgumentException(string.Format(CultureInfo.CurrentUICulture,
  26                     SR.InvalidExpressionMorphHelperType, expressionMorphHelperType.FullName, typeof(ExpressionMorphHelper).FullName)));
  27             }
  28         }
  29
  30         public Type ExpressionMorphHelperType
  31         {
  32             get
  33             {
  34                 return this.helperType;
  35             }
  36         }
  37     }
  38 }