class/System.Design/System.Diagnostics.Design/StringValueConverter.cs

   1 //
   2 // System.Diagnostics.Design.StringValueConverter.cs
   3 //
   4 // Authors:
   5 //      Gert Driesen (drieseng@users.sourceforge.net)
   6 //
   7 // Copyright (C) 2008 Gert Driesen
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.ComponentModel;
  31 using System.Globalization;
  32
  33 namespace System.Diagnostics.Design
  34 {
  35         internal class StringValueConverter : TypeConverter
  36         {
  37                 public StringValueConverter ()
  38                 {
  39                 }
  40
  41                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  42                 {
  43                         if (sourceType == typeof (String))
  44                                 return true;
  45
  46                         return base.CanConvertFrom (context, sourceType);
  47                 }
  48
  49                 public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
  50                 {
  51                         string text = value as string;
  52                         if (text != null) {
  53                                 text = text.Trim ();
  54                                 if (text.Length == 0)
  55                                         return null;
  56                                 return text;
  57                         }
  58
  59                         return base.ConvertFrom (context, culture, value);
  60                 }
  61         }
  62 }