mcs/class/System/System.ComponentModel/DefaultValueAttribute.cs

   1 //
   2 // System.ComponentModel.DefaultValueAttribute.cs
   3 //
   4 // Authors:
   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 namespace System.ComponentModel
  32 {
  33         [AttributeUsage(AttributeTargets.All)]
  34         public sealed class DefaultValueAttribute : Attribute
  35         {
  36
  37                 private object DefaultValue;
  38
  39                 public DefaultValueAttribute (bool value)
  40                 {
  41                         DefaultValue = value;
  42                 }
  43
  44                 public DefaultValueAttribute (byte value)
  45                 {
  46                         DefaultValue = value;
  47                 }
  48
  49                 public DefaultValueAttribute (char value)
  50                 {
  51                         DefaultValue = value;
  52                 }
  53
  54                 public DefaultValueAttribute (double value)
  55                 {
  56                         DefaultValue = value;
  57                 }
  58
  59                 public DefaultValueAttribute (short value)
  60                 {
  61                         DefaultValue = value;
  62                 }
  63
  64                 public DefaultValueAttribute (int value)
  65                 {
  66                         DefaultValue = value;
  67                 }
  68
  69                 public DefaultValueAttribute (long value)
  70                 {
  71                         DefaultValue = value;
  72                 }
  73
  74                 public DefaultValueAttribute (object value)
  75                 {
  76                         DefaultValue = value;
  77                 }
  78
  79                 public DefaultValueAttribute (float value)
  80                 {
  81                         DefaultValue = value;
  82                 }
  83
  84                 public DefaultValueAttribute (string value)
  85                 {
  86                         DefaultValue = value;
  87                 }
  88
  89                 public DefaultValueAttribute (Type type, string value)
  90                 {
  91                         // TODO check if this implementation is correct
  92                         try {
  93                                 DefaultValue = Convert.ChangeType (value, type);
  94                         }
  95                         catch {
  96                                 DefaultValue = null;
  97                         }
  98                 }
  99
 100                 public object Value {
 101                         get { return DefaultValue; }
 102                 }
 103
 104                 public override bool Equals (object obj)
 105                 {
 106                         if (!(obj is DefaultValueAttribute))
 107                                 return false;
 108                         if (obj == this)
 109                                 return true;
 110                         return ((DefaultValueAttribute) obj).Value == DefaultValue;
 111                 }
 112
 113                 public override int GetHashCode()
 114                 {
 115                         return DefaultValue.GetHashCode();
 116                 }
 117         }
 118 }