private static void AddAttributes(ResultBox box, ValueHandler valueHandler, OptionAttribute optionAttribute)
{
object defaultValue = null;
if (optionAttribute != null)
{
if (optionAttribute.Alias != null) box.StoreByName = optionAttribute.Alias;
//validate that types for default value match
Type dvt = optionAttribute.DefaultValue?.GetType();
if (optionAttribute.DefaultValue != null)
{
if (dvt != box.ResultType && dvt != typeof(string))
{
throw new InvalidCastException($"Default value for option {box.Name} is of type {dvt.FullName} whereas the property has type {box.Name}. To fix this, either set default value to type {box.ResultType.FullName} or a string parseable to the target type.");
}
if (box.ResultType != typeof(string) && dvt == typeof(string))
{
valueHandler.TryParse(box.ResultType, (string)optionAttribute.DefaultValue, out defaultValue);
}
}
if (defaultValue == null)
{
defaultValue = optionAttribute.DefaultValue;
}
}
if (defaultValue == null) defaultValue = GetDefaultValue(box.ResultType);
box.DefaultResult = defaultValue;
}
private static object GetDefaultValue(object defaultValue, ResultBox box, ValueHandler valueHandler)
{
object result = null;
if (defaultValue != null)
{
//validate that types for default value match
Type dvt = defaultValue?.GetType();
if (dvt != box.ResultType && dvt != typeof(string))
{
throw new InvalidCastException($"Default value for option {box.Name} is of type {dvt.FullName} whereas the property has type {box.Name}. To fix this, either set default value to type {box.ResultType.FullName} or a string parseable to the target type.");
}
if (box.ResultType != typeof(string) && dvt == typeof(string))
{
valueHandler.TryParse(box.ResultType, (string)defaultValue, out result);
}
}
if (result == null)
{
result = defaultValue;
}
return(result);
}