mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/View/VersionEditorViewModel.cs

   1 //----------------------------------------------------------------
   2 // <copyright company="Microsoft Corporation">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //----------------------------------------------------------------
   6
   7 namespace System.Activities.Presentation.View
   8 {
   9     using System.Runtime;
  10
  11     internal class VersionEditorViewModel : ViewModel
  12     {
  13         private IVersionEditor editor;
  14         private Version version;
  15
  16         public VersionEditorViewModel(IVersionEditor editor)
  17         {
  18             Fx.Assert(editor != null, "editor should not be null");
  19             this.editor = editor;
  20         }
  21
  22         public string VersionText
  23         {
  24             get
  25             {
  26                 if (this.version == null)
  27                 {
  28                     return null;
  29                 }
  30
  31                 return this.version.ToString();
  32             }
  33
  34             set
  35             {
  36                 if (this.VersionText != value)
  37                 {
  38                     if (string.IsNullOrEmpty(value))
  39                     {
  40                         this.Version = null;
  41                         return;
  42                     }
  43
  44                     Exception exception = null;
  45
  46                     try
  47                     {
  48                         this.Version = Version.Parse(value);
  49                     }
  50                     catch (ArgumentOutOfRangeException ex)
  51                     {
  52                         exception = ex;
  53                     }
  54                     catch (ArgumentException ex)
  55                     {
  56                         exception = ex;
  57                     }
  58                     catch (FormatException ex)
  59                     {
  60                         exception = ex;
  61                     }
  62                     catch (OverflowException ex)
  63                     {
  64                         exception = ex;
  65                     }
  66
  67                     if (exception != null)
  68                     {
  69                         this.editor.ShowErrorMessage(exception.Message);
  70
  71                         // update UI to its old value
  72                         this.NotifyPropertyChanged("VersionText");
  73                     }
  74                 }
  75             }
  76         }
  77
  78         public Version Version
  79         {
  80             get
  81             {
  82                 return this.version;
  83             }
  84
  85             set
  86             {
  87                 if (this.version != value)
  88                 {
  89                     this.version = value;
  90                     this.NotifyPropertyChanged("Version");
  91                     this.NotifyPropertyChanged("VersionText");
  92                 }
  93             }
  94         }
  95     }
  96 }