public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
ColumnWidthUnitType unitType;
if (value == null)
{
throw new ArgumentNullException("value");
}
if (value is ColumnWidth)
{
return(value);
}
if (value is string)
{
return(ColumnWidthConverter.FromString(( string )value, culture));
}
double doubleValue = Convert.ToDouble(value, culture);
unitType = ColumnWidthUnitType.Pixel;
return(new ColumnWidth(doubleValue, unitType));
}
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == null)
{
throw new ArgumentNullException("destinationType");
}
if ((value != null) && (value is ColumnWidth))
{
ColumnWidth columnWidth = ( ColumnWidth )value;
if (destinationType == typeof(string))
{
return(ColumnWidthConverter.ToString(columnWidth, culture));
}
// If we ever want to add InstanceDescriptor in the list of supported destination
// type, we will have to implement it in another method and surround the call
// with a try/catch. Otherwise, the call to Type.GetConstructor() will fail if
// the application does not have reflection permission (typically XBAP).
}
throw new ArgumentException("Cannot convert to type " + destinationType.FullName + ".", "value");
}