/// <summary>
/// 確認所有條件是有任一為null
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="root"></param>
/// <param name="getter"></param>
/// <returns></returns>
public static bool IsNull <T>(this T root, Expression <Func <T, object> > getter)
{
var visitor = new NullVisitor()
{
CurrentObject = root
};
visitor.Visit(getter);
return(visitor.IsNull);
}
