C# Command-Line Option Parsing Library

Hi,
One could add nullable type support to the library by changing OptionResult.CheckType and OptionDefinition.ConvertValue functions as as shown below.

OptionResult
======
private void CheckType(object value) {
if (value == null &&
!(_defintion.ValueType.IsGenericType && _defintion.ValueType.GetGenericTypeDefinition().Equals(typeof(Nullable<>))) &&
typeof(ValueType).IsAssignableFrom(_defintion.ValueType)) {
throw new InvalidValueException("Null is not supported for this type");
}


OptionDefinition
=================
public object ConvertValue(string value) {
try {
if (_valueType.IsGenericType && _valueType.GetGenericTypeDefinition().Equals(typeof(Nullable<>))) {
if (value == null) {
return null;
}

Type underlyingType = new NullableConverter(_valueType).UnderlyingType;

if (underlyingType.IsEnum) {
return Enum.Parse(underlyingType, value);
}

return Convert.ChangeType(value,new NullableConverter(_valueType).UnderlyingType);
}

return Convert.ChangeType(value,_valueType);
}
catch (Exception ex) {
throw new InvalidValueException("Invalue value: " + value,ex);
}
}

Regards,
Fatih Boy