摘要：
http://www.codeproject.com/Articles/630277/Generic-Data-Access-Layer-GDA-Part-Ihttp://www.codeproject.com/Articles/681565/Self-Synchronized-Data-Acces... 阅读全文
摘要：
https://msdn.microsoft.com/en-us/library/bcd5672a.aspx 官方的说法The protected keyword is a member access modifier. A protected member is accessible within 阅读全文