public static int ParseAndValidateRequiredResourceIndex(this IThreeMfPropertyResource propertyResource, XElement element, string attributeName)
{
var index = element.AttributeIntValueOrThrow(attributeName);
propertyResource.ValidatePropertyIndex(index);
return(index);
}
public static int?ParseAndValidateOptionalResourceIndex(this IThreeMfPropertyResource propertyResource, XElement element, string attributeName)
{
var attribute = element.Attribute(attributeName);
if (attribute == null)
{
return(null);
}
if (!int.TryParse(attribute.Value, out var index))
{
throw new ThreeMfParseException($"Property index '{attribute.Value}' is not an int.");
}
propertyResource.ValidatePropertyIndex(index);
return(index);
}