mcs/class/System/System.ComponentModel/GuidConverter.cs

   1 //
   2 // System.ComponentModel.GuidConverter
   3 //
   4 // Author:
   5 //  Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   6 //
   7 // (C) 2003 Andreas Nahr
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Globalization;
  32
  33 namespace System.ComponentModel
  34 {
  35         public class GuidConverter : TypeConverter
  36         {
  37
  38                 public GuidConverter()
  39                 {
  40                 }
  41
  42                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  43                 {
  44                         if (sourceType == typeof (string))
  45                                 return true;
  46                         return base.CanConvertFrom (context, sourceType);
  47                 }
  48
  49                 public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
  50                 {
  51                         if (destinationType == typeof (string))
  52                                 return true;
  53                         return base.CanConvertTo (context, destinationType);
  54                 }
  55
  56                 public override object ConvertFrom (ITypeDescriptorContext context,
  57                                                     CultureInfo culture, object value)
  58                 {
  59                         if (value.GetType() == typeof (string)) {
  60                                 string GuidString = (string) value;
  61                                 try {
  62                                         return new Guid (GuidString);
  63                                 } catch {
  64                                         throw new FormatException (GuidString + "is not a valid GUID.");
  65                                 }
  66                         }
  67                         return base.ConvertFrom (context, culture, value);
  68                 }
  69
  70                 public override object ConvertTo (ITypeDescriptorContext context,
  71                                                   CultureInfo culture, object value, Type destinationType)
  72                 {
  73                         if (destinationType == typeof (string) && value != null &&value.GetType() == typeof (Guid))
  74                                 // LAMESPEC MS seems to always parse "D" type
  75                                 return ((Guid) value).ToString("D");
  76                         return base.ConvertTo (context, culture, value, destinationType);
  77                 }
  78         }
  79 }