public override object ConvertTo
(
System.ComponentModel.ITypeDescriptorContext context,
System.Globalization.CultureInfo culture,
object value,
Type destinationType
)
{
if (typeof(string) == destinationType)
{
Source_GPIOList gpioList = value as Source_GPIOList;
if (null == gpioList)
{
throw new ArgumentException("Expected a Source_GPIOList", "value");
}
StringBuilder sb = new StringBuilder( );
foreach (Source_GPIO gpio in gpioList)
{
Object obj = TypeDescriptor.GetConverter(typeof(Source_GPIO)).ConvertToString(gpio);
if (null == obj)
{
// Should NOT be possible ~ should get exception for bad arg
// before seeing a null == obj return value
}
else
{
sb.Append(obj as String);
sb.Append(';');
}
}
return(sb.ToString( ));
}
return(base.ConvertTo(context, culture, value, destinationType));
}
public override object ConvertFrom
(
System.ComponentModel.ITypeDescriptorContext context,
System.Globalization.CultureInfo culture,
Object value
)
{
Source_GPIOList gpioList = new Source_GPIOList( );
if (String.IsNullOrEmpty(value as string))
{
return(gpioList);
}
String[] gpioPinStrings = (value as String).Split(new Char[] { ';' });
if (null == gpioPinStrings)
{
return(gpioList);
}
foreach (String s in gpioPinStrings)
{
Object obj = TypeDescriptor.GetConverter(typeof(Source_GPIO)).ConvertFromString(s);
if (null == obj)
{
// TODO : supply err msg || rely on Source_GPIO converter for msg
}
else
{
gpioList.Add(obj as Source_GPIO);
}
}
return(gpioList);
}
