mcs/class/System/System.ComponentModel/CharConverter.cs

   1 //
   2 // System.ComponentModel.CharConverter
   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 CharConverter : TypeConverter
  36         {
  37                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  38                 {
  39                         if (sourceType == typeof (string))
  40                                 return true;
  41                         return base.CanConvertFrom (context, sourceType);
  42                 }
  43
  44                 public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
  45                 {
  46                         if (value.GetType() == typeof (string)) {
  47                                 string Test = (String) value;
  48                                 if (Test.Length != 1)
  49                                 // LAMESPEC: MS does throw FormatException here
  50                                         throw new FormatException ("String has to be exactly one char long");
  51                                 return Test[0];
  52                         }
  53                         return base.ConvertFrom (context, culture, value);
  54                 }
  55
  56                 public override object ConvertTo (ITypeDescriptorContext context,
  57                                                   CultureInfo culture, object value, Type destinationType)
  58                 {
  59                         if (destinationType == typeof (string))
  60                         if (value != null && value is char)
  61                                 return new string ((char) value, 1);
  62
  63                         return base.ConvertTo (context, culture, value, destinationType);
  64                 }
  65         }
  66 }
  67