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

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.View
   6 {
   7     using System.Diagnostics;
   8     using System.Globalization;
   9     using System.Windows.Data;
  10     using System.Runtime;
  11
  12     class TypeToStringValueConverter : IValueConverter
  13     {
  14         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  15         {
  16             Fx.Assert(targetType.Equals(typeof(string)), "TypeToStringValueConverter cannot convert a type to type " + targetType.FullName);
  17             string target = null;
  18             if (value != null)
  19             {
  20                 Fx.Assert(value is Type, string.Format(CultureInfo.InvariantCulture, "TypeToStringValueConverter cannot convert from type {0} to string", value.GetType().FullName));
  21                 Type editedType = (Type)value;
  22                 //handle primitive types
  23                 if (editedType.IsPrimitive || editedType.IsValueType ||
  24                     editedType == typeof(string) || editedType == typeof(object))
  25                 {
  26                     target = editedType.Name;
  27                 }
  28                     //and other ones
  29                 else
  30                 {
  31                     target = editedType.FullName;
  32                 }
  33             }
  34             return target;
  35         }
  36
  37         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  38         {
  39             Fx.Assert(targetType.Equals(typeof(Type)), "TypeToStringValueConverter cannot convert string back to type " + targetType.FullName);
  40             Type target = null;
  41             string stringValue = value as string;
  42             if (!string.IsNullOrEmpty(stringValue))
  43             {
  44                 // try to get the type from the type name
  45                 target = Type.GetType(stringValue, false, true);
  46                 //handle primitive types
  47                 if (null == target)
  48                 {
  49                     stringValue = string.Format(CultureInfo.InvariantCulture, "System.{0}", stringValue);
  50                     target = Type.GetType(stringValue, false, true);
  51                 }
  52                 if (null == target)
  53                 {
  54                     return Binding.DoNothing;
  55                 }
  56             }
  57             return target;
  58         }
  59     }
  60 }