mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/ViewState/ViewStateManager.cs

   1 //----------------------------------------------------------------
   2 // <copyright company="Microsoft Corporation">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //----------------------------------------------------------------
   6
   7 namespace System.Activities.Presentation.ViewState
   8 {
   9     using System.Collections.Generic;
  10     using System.Collections.ObjectModel;
  11     using System.Windows.Markup;
  12
  13     /// <summary>
  14     /// This class is used to hold ViewStateData for all activities in the workflow as an attached
  15     /// property on the root of the xaml document.
  16     /// </summary>
  17     [ContentProperty("ViewStateData")]
  18     public sealed class ViewStateManager
  19     {
  20         Collection<ViewStateData> viewStateData;
  21
  22         /// <summary>
  23         /// Creates a new instance of ViewStateManager
  24         /// </summary>
  25         public ViewStateManager()
  26         {
  27         }
  28
  29         /// <summary>
  30         /// Gets a collection of ViewStateData for all activities in the workflow
  31         /// </summary>
  32         public Collection<ViewStateData> ViewStateData
  33         {
  34             get
  35             {
  36                 if (this.viewStateData == null)
  37                 {
  38                     this.viewStateData = new Collection<ViewStateData>();
  39                 }
  40                 return this.viewStateData;
  41             }
  42         }
  43     }
  44 }