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.ComponentModel.Design.Serialization;
  34 using System.Globalization;
  35 using System.Reflection;
  36
  37 namespace System.ComponentModel
  38 {
  39         public class DateTimeConverter : TypeConverter
  40         {
  41                 public DateTimeConverter()
  42                 {
  43                 }
  44
  45                 public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
  46                 {
  47                         if (sourceType == typeof (string))
  48                                 return true;
  49                         return base.CanConvertFrom (context, sourceType);
  50                 }
  51
  52                 public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
  53                 {
  54                         if (destinationType == typeof (InstanceDescriptor))
  55                                 return true;
  56                         return base.CanConvertTo (context, destinationType);
  57                 }
  58
  59                 public override object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
  60                 {
  61                         if (value is string) {
  62                                 string DateString = (string) value;
  63                                 try {
  64                                         if (DateString != null && DateString.Trim ().Length == 0) {
  65                                                 return DateTime.MinValue;
  66                                         } else if (culture == null) {
  67                                                 return DateTime.Parse (DateString);
  68                                         } else {
  69                                                 DateTimeFormatInfo info = (DateTimeFormatInfo) culture.GetFormat (typeof (DateTimeFormatInfo));
  70                                                 return DateTime.Parse (DateString, info);
  71                                         }
  72                                 } catch {
  73                                         throw new FormatException (DateString + " is not a valid DateTime value.");
  74                                 }
  75                         }
  76                         return base.ConvertFrom (context, culture, value);
  77                 }
  78
  79                 public override object ConvertTo (ITypeDescriptorContext context, CultureInfo culture, object value,
  80                                                   Type destinationType)
  81                 {
  82                         if (value is DateTime) {
  83                                 DateTime datetime = (DateTime) value;
  84                                 if (destinationType == typeof (string)) {
  85                                         if (culture == null)
  86                                                 culture = CultureInfo.CurrentCulture;
  87
  88                                         if (datetime == DateTime.MinValue)
  89                                                 return string.Empty;
  90
  91                                         DateTimeFormatInfo info = (DateTimeFormatInfo) culture.GetFormat (typeof (DateTimeFormatInfo));
  92
  93                                         if (culture == CultureInfo.InvariantCulture) {
  94                                                 if (datetime.Equals (datetime.Date)) {
  95                                                         return datetime.ToString ("yyyy-MM-dd", culture);
  96                                                 }
  97                                                 return datetime.ToString (culture);
  98                                         } else {
  99                                                 if (datetime == datetime.Date) {
 100                                                         return datetime.ToString (info.ShortDatePattern, culture);
 101                                                 } else {
 102                                                         return datetime.ToString (info.ShortDatePattern + " " +
 103                                                                 info.ShortTimePattern, culture);
 104                                                 }
 105                                         }
 106                                 } else if (destinationType == typeof (InstanceDescriptor)) {
 107                                         ConstructorInfo ctor = typeof(DateTime).GetConstructor (new Type[] {typeof(long)});
 108                                         return new InstanceDescriptor (ctor, new object[] { datetime.Ticks });
 109                                 }
 110                         }
 111                         return base.ConvertTo (context, culture, value, destinationType);
 112                 }
 113         }
 114 }