mcs/class/referencesource/System.Activities.Core.Presentation/System/ServiceModel/Activities/Presentation/ActivityXRefConverter.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.ServiceModel.Activities.Presentation
   6 {
   7     using System;
   8     using System.Globalization;
   9     using System.Windows.Data;
  10     using System.Activities.Presentation.Model;
  11     using System.Activities;
  12     using System.Activities.Core.Presentation;
  13
  14     sealed class ActivityXRefConverter : IValueConverter
  15     {
  16         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  17         {
  18             if (!(targetType == typeof(string) || targetType == typeof(object)))
  19             {
  20                 throw FxTrace.Exception.AsError(new NotSupportedException());
  21             }
  22             if (null == value)
  23             {
  24                 throw FxTrace.Exception.AsError(new ArgumentNullException("value"));
  25             }
  26             ModelItem activity = value as ModelItem;
  27             string displayName = value as string;
  28
  29             string formatString = (parameter as string) ?? "{0}";
  30
  31             if (null != activity && typeof(Activity).IsAssignableFrom(activity.ItemType))
  32             {
  33                 displayName = ((string)activity.Properties["DisplayName"].ComputedValue);
  34             }
  35
  36             if (null == displayName)
  37             {
  38                 displayName = "<null>";
  39             }
  40             else if (displayName.Length == 0)
  41             {
  42                 displayName = "...";
  43             }
  44
  45             return string.Format(CultureInfo.CurrentUICulture, formatString, displayName);
  46         }
  47
  48         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  49         {
  50             throw FxTrace.Exception.AsError(new NotSupportedException());
  51         }
  52     }
  53 }