class/System.Xaml/System.Windows.Markup/TypeExtensionConverter.cs

   1 //
   2 // Copyright (C) 2010 Novell Inc. http://novell.com
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining
   5 // a copy of this software and associated documentation files (the
   6 // "Software"), to deal in the Software without restriction, including
   7 // without limitation the rights to use, copy, modify, merge, publish,
   8 // distribute, sublicense, and/or sell copies of the Software, and to
   9 // permit persons to whom the Software is furnished to do so, subject to
  10 // the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be
  13 // included in all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 //
  23 using System;
  24 using System.Collections.Generic;
  25 using System.ComponentModel;
  26 using System.Globalization;
  27 using System.Reflection;
  28 using System.Xaml;
  29 using System.Xaml.Schema;
  30
  31 namespace System.Windows.Markup
  32 {
  33         internal class TypeExtensionConverter : TypeConverter
  34         {
  35                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  36                 {
  37                         return false;
  38                 }
  39
  40                 public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
  41                 {
  42                         return destinationType == typeof (string);
  43                 }
  44
  45                 public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
  46                 {
  47                         throw new NotSupportedException (String.Format ("Conversion from type {0} is not supported", value != null ? value.GetType () : null));
  48                 }
  49
  50                 public override object ConvertTo (ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
  51                 {
  52                         var xt = value as XamlType;
  53                         if (xt != null) {
  54                                 if (destinationType == typeof (string))
  55                                         return xt.ToString ();
  56                                 throw new NotSupportedException (String.Format ("Conversion to type {0} is not supported", destinationType));
  57                         }
  58                         else
  59                                 return base.ConvertTo (context, culture, value, destinationType); // it seems it still handles not-supported types (such as int).
  60                 }
  61         }
  62 }