private static void ValidateTitle(CreateShoppingListCommand cmd, IList <Error> errorsList)
{
if (string.IsNullOrWhiteSpace(cmd.Title))
{
errorsList.Add(new Error(ShoppingListErrors.BlankTitle));
}
}
public static bool Validate(this CreateShoppingListCommand cmd, out Error[]?errors)
{
var errorsList = new List <Error>();
ValidateTitle(cmd, errorsList);
errors = errorsList.Count > 0 ? errorsList.ToArray() : null;
return(errorsList.Count == 0);
}