class/System.Xaml/System.Windows.Markup/NameReferenceConverter.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;
  25 using System.Collections.Generic;
  26 using System.ComponentModel;
  27 using System.Globalization;
  28 using System.Xaml;
  29
  30 namespace System.Windows.Markup
  31 {
  32         public class NameReferenceConverter : TypeConverter
  33         {
  34                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  35                 {
  36                         return sourceType == typeof (string);
  37                 }
  38
  39                 public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
  40                 {
  41                         if (context == null)
  42                                 return false;
  43                         var p = context.GetService (typeof (IXamlNameProvider)) as IXamlNameProvider;
  44                         return p != null && destinationType == typeof (string);
  45                 }
  46
  47                 public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
  48                 {
  49                         if (context == null)
  50                                 throw new ArgumentNullException ("context");
  51                         var s = value as string;
  52                         if (String.IsNullOrEmpty (s))
  53                                 throw new InvalidOperationException ("Value must be non-null string.");
  54
  55                         return s;
  56                 }
  57
  58                 public override object ConvertTo (ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
  59                 {
  60                         if (context == null)
  61                                 return null;
  62                         var p = context.GetService (typeof (IXamlNameProvider)) as IXamlNameProvider;
  63                         return p != null ? p.GetName (value) : null;
  64                 }
  65         }
  66 }