mcs/class/System/System.ComponentModel/DateTimeConverter.cs

   1 //
   2 // System.ComponentModel.DateTimeConverter
   3 //
   4 // Authors:
   5 //  Martin Willemoes Hansen (mwh@sysrq.dk)
   6 //  Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) 2003 Martin Willemoes Hansen
   9 // (C) 2003 Andreas Nahr
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.Globalization;
  34
  35 namespace System.ComponentModel
  36 {
  37         public class DateTimeConverter : TypeConverter
  38         {
  39
  40                 public DateTimeConverter()
  41                 {
  42                 }
  43
  44                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  45                 {
  46                         if (sourceType == typeof (string))
  47                                 return true;
  48                         return base.CanConvertFrom (context, sourceType);
  49                 }
  50
  51                 public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
  52                 {
  53                         if (destinationType == typeof (string))
  54                                 return true;
  55                         return base.CanConvertTo (context, destinationType);
  56                 }
  57
  58                 public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
  59                 {
  60                         if (value.GetType() == typeof (string)) {
  61                                 string DateString = (String) value;
  62                                 try {
  63                                         if (culture == null)
  64                                                 // try to parse string
  65                                                 return DateTime.Parse (DateString);
  66                                         else
  67                                                 // try to parse string
  68                                                 return DateTime.Parse (DateString, culture.DateTimeFormat);
  69                                 } catch {
  70                                         throw new FormatException (DateString + "is not a valid DateTime value.");
  71                                 }
  72                         }
  73                         return base.ConvertFrom (context, culture, value);
  74                 }
  75
  76                 public override object ConvertTo (ITypeDescriptorContext context, CultureInfo culture, object value,
  77                                                   Type destinationType)
  78                 {
  79                         if (destinationType == typeof (string) && value != null && (value is DateTime)) {
  80                                 CultureInfo CurrentCulture = culture;
  81                                 if (CurrentCulture == null)
  82                                         CurrentCulture = CultureInfo.CurrentCulture;
  83                                 DateTime ConvertTime = (DateTime) value;
  84
  85                                 if (CurrentCulture.Equals(CultureInfo.InvariantCulture)) {
  86                                         if (ConvertTime.Equals(ConvertTime.Date))
  87                                                 return ConvertTime.ToString("yyyy-mm-dd");
  88                                         else
  89                                                 return ConvertTime.ToString ();
  90                                 } else {
  91                                         if (ConvertTime.Equals(ConvertTime.Date))
  92                                                 return ConvertTime.ToString (CurrentCulture.DateTimeFormat.ShortDatePattern);
  93                                         else
  94                                                 return ConvertTime.ToString (CurrentCulture.DateTimeFormat.ShortDatePattern +
  95                                                         " " + CurrentCulture.DateTimeFormat.ShortTimePattern);
  96                                 }
  97                         }
  98                         return base.ConvertTo (context, culture, value, destinationType);
  99                 }
 100         }
 101 }