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PropertyGrid values in hex/hexadecimal using class derived from TypeConverter

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Displaying values as hex in a PropertyGrid by using a TypeConverter class. The TypeConverter class is assigned as a property to the PropertyGrid's data element.

Consider improving by making the UInt32HexTypeConverter a generic/template as in HexTypeConverter. Also, consider deriving from BaseNumberConverter .

See 'How to: Implement a Type Converter' in MSDN

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  1. // Included...
  2. // [1] Define TypeConverter class for hex.
  3. // [2] use it when defining a member of a data class using attribute TypeConverter.
  4. // [3] Connect the data class to a PropertyGrid.
  5.  
  6.  
  7. // [1] define UInt32HexTypeConverter is-a TypeConverter
  8. public class UInt32HexTypeConverter : TypeConverter
  9. {
  10.    public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
  11.    {
  12.       if (sourceType == typeof(string))
  13.       {
  14.          return true;
  15.       }
  16.       else
  17.       {
  18.          return base.CanConvertFrom(context, sourceType);
  19.       }
  20.    }
  21.  
  22.    public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
  23.    {
  24.       if (destinationType == typeof(string))
  25.       {
  26.          return true;
  27.       }
  28.       else
  29.       {
  30.          return base.CanConvertTo(context, destinationType);
  31.       }
  32.    }
  33.  
  34.    public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
  35.    {
  36.       if (destinationType == typeof(string) && value.GetType() == typeof(UInt32))
  37.       {
  38.          return string.Format("0x{0:X8}", value);
  39.       }
  40.       else
  41.       {
  42.          return base.ConvertTo(context, culture, value, destinationType);
  43.       }
  44.    }
  45.  
  46.    public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
  47.    {
  48.       if (value.GetType() == typeof(string))
  49.       {
  50.          string input = (string)value;
  51.  
  52.          if (input.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
  53.          {
  54.             input = input.Substring(2);
  55.          }
  56.  
  57.          return UInt32.Parse(input, System.Globalization.NumberStyles.HexNumber, culture);
  58.       }
  59.       else
  60.       {
  61.          return base.ConvertFrom(context, culture, value);
  62.       }
  63.    }
  64. } // UInt32HexTypeConverter used by grid to display hex.
  65.  
  66.  
  67. // [2] define a class for data to be associated with the PropertyGrid.
  68.       [DefaultPropertyAttribute("Name")]
  69.       public class Data 
  70. .
  71. .
  72. .
  73.          public UInt32 stat;
  74.          [CategoryAttribute("Main Scanner"), DescriptionAttribute("Status"), TypeConverter(typeof(UInt32HexTypeConverter))]
  75.          public UInt32 Status
  76.          {
  77.             get { return stat; }
  78.          }
  79. .
  80. .
  81. .
  82. // [3] reference data for propertyGrid. (here, myData is a Data).
  83.          propertyGrid1.SelectedObject = myData ;

URL: http://koniosis.blogspot.com/2009/02/integers-as-hex-in-propertygrid-c-net.html

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