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

   1 //----------------------------------------------------------------
   2 // <copyright company="Microsoft Corporation">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //----------------------------------------------------------------
   6
   7 namespace System.Activities.Presentation
   8 {
   9     using System.Collections.Generic;
  10     using System.Runtime;
  11
  12     internal static class PropertyReferenceUtilities
  13     {
  14         public static string GetPropertyReference(object instance, string targetProperty)
  15         {
  16             Fx.Assert(instance != null, "instance should not be null.");
  17             Fx.Assert(!string.IsNullOrEmpty(targetProperty), "targetProperty should not be null or empty.");
  18
  19             IList<ActivityPropertyReference> references = ActivityBuilder.GetPropertyReferences(instance);
  20
  21             Fx.Assert(references != null, "references should not be null");
  22
  23             foreach (ActivityPropertyReference reference in references)
  24             {
  25                 if (StringComparer.Ordinal.Equals(reference.TargetProperty, targetProperty))
  26                 {
  27                     return reference.SourceProperty;
  28                 }
  29             }
  30
  31             return null;
  32         }
  33
  34         public static void SetPropertyReference(object instance, string targetProperty, string sourceProperty)
  35         {
  36             Fx.Assert(instance != null, "instance should not be null.");
  37             Fx.Assert(!string.IsNullOrEmpty(targetProperty), "targetProperty should not be null or empty.");
  38
  39             ActivityPropertyReference entry = null;
  40             IList<ActivityPropertyReference> references = ActivityBuilder.GetPropertyReferences(instance);
  41
  42             Fx.Assert(references != null, "references should not be null");
  43
  44             foreach (ActivityPropertyReference reference in references)
  45             {
  46                 if (StringComparer.Ordinal.Equals(reference.TargetProperty, targetProperty))
  47                 {
  48                     entry = reference;
  49                     break;
  50                 }
  51             }
  52
  53             if (string.IsNullOrEmpty(sourceProperty))
  54             {
  55                 if (entry != null)
  56                 {
  57                     references.Remove(entry);
  58                 }
  59             }
  60             else
  61             {
  62                 if (entry != null)
  63                 {
  64                     entry.SourceProperty = sourceProperty;
  65                 }
  66                 else
  67                 {
  68                     entry = new ActivityPropertyReference();
  69                     entry.TargetProperty = targetProperty;
  70                     entry.SourceProperty = sourceProperty;
  71                     references.Add(entry);
  72                 }
  73             }
  74         }
  75     }
  76 }