mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/CachedResourceDictionaryExtension.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation
   6 {
   7     using System;
   8     using System.Collections.Generic;
   9     using System.Linq;
  10     using System.Text;
  11     using System.Windows;
  12     using System.Windows.Markup;
  13
  14     [MarkupExtensionReturnType(typeof(ResourceDictionary))]
  15     public class CachedResourceDictionaryExtension : MarkupExtension
  16     {
  17         static Dictionary<Uri, ResourceDictionary> Cache = new Dictionary<Uri, ResourceDictionary>();
  18
  19         public Uri Source { get; set; }
  20
  21         public override object ProvideValue(IServiceProvider serviceProvider)
  22         {
  23             ResourceDictionary resourceDictionary = null;
  24             // disable caching till the wpf mergedictionaries in theme dictionary bug is fixed.
  25             if (!Cache.TryGetValue(this.Source, out resourceDictionary))
  26             {
  27                 resourceDictionary = new ResourceDictionary();
  28                 resourceDictionary.Source = this.Source;
  29                 Cache.Add(this.Source, resourceDictionary);
  30             }
  31             return resourceDictionary;
  32         }
  33     }
  34 }