如何产生 XPO 的WCF服务中间层？ 参考有关文章：
1、How to implement a distributed object layer service working via WCF
https://www.devexpress.com/Support/Center/Example/Details/E5072/how-to-implement-a-distributed-object-layer-service-working-via-wcf
2、How to connect to a remote data service instead of using a direct database connection
3、
