mcs/class/System.Design/System.Web.UI.Design/DataFieldConverter.cs

   1 //
   2 // System.Web.UI.Design.DataFieldConverter
   3 //
   4 // Authors:
   5 //      Gert Driesen (drieseng@users.sourceforge.net)
   6 //
   7 // (C) 2004 Novell
   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.ComponentModel;
  32 using System.Globalization;
  33
  34 namespace System.Web.UI.Design
  35 {
  36         public class DataFieldConverter : TypeConverter
  37         {
  38                 public DataFieldConverter ()
  39                 {
  40                 }
  41
  42                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  43                 {
  44                         return (sourceType == typeof(string));
  45                 }
  46
  47                 public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
  48                 {
  49                         if (value == null)
  50                                 return string.Empty;
  51
  52                         if (value.GetType () == typeof(string))
  53                                 return ((string) value);
  54
  55                         throw base.GetConvertFromException (value);
  56                 }
  57
  58                 [MonoTODO]
  59                 public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
  60                 {
  61                         throw new NotImplementedException ();
  62                 }
  63
  64                 public override bool GetStandardValuesExclusive (ITypeDescriptorContext context)
  65                 {
  66                         return false;
  67                 }
  68
  69                 public override bool GetStandardValuesSupported (ITypeDescriptorContext context)
  70                 {
  71                         return ((context.Instance as IComponent) != null);
  72                 }
  73         }
  74 }