mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/Model/AttachedPropertiesService.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.Model
   6 {
   7     using System;
   8     using System.Collections.Generic;
   9     using System.Linq;
  10     using System.Text;
  11     using System.Runtime;
  12
  13     public class AttachedPropertiesService
  14     {
  15         List<AttachedProperty> properties;
  16
  17         public AttachedPropertiesService()
  18         {
  19             this.properties = new List<AttachedProperty>();
  20         }
  21
  22         public void AddProperty(AttachedProperty property)
  23         {
  24             if (property == null)
  25             {
  26                 throw FxTrace.Exception.AsError(new ArgumentNullException("property"));
  27             }
  28             if (string.IsNullOrEmpty(property.Name))
  29             {
  30                 throw FxTrace.Exception.AsError(new ArgumentException(SR.AttachedPropertyNameShouldNotBeEmpty));
  31             }
  32             this.properties.Add(property);
  33         }
  34
  35         internal IEnumerable<AttachedProperty> GetAttachedProperties(Type modelItemType)
  36         {
  37             var properties = from property in this.properties
  38                 where property.OwnerType.IsAssignableFrom(modelItemType) select property;
  39
  40             if (modelItemType.IsGenericType)
  41             {
  42                 var propertiesFromGenericRoot = from property in this.properties
  43                                                 where property.OwnerType.IsAssignableFrom(modelItemType.GetGenericTypeDefinition())
  44                                                 select property;
  45                 properties = properties.Concat(propertiesFromGenericRoot).Distinct();
  46             }
  47
  48             return properties;
  49         }
  50     }
  51
  52 }