错误提示：

“Unable to check out the current file. The file may be read-only or locked, or you may need to check out the file manually.”

解决方案：

run Visual Studio as Administrator.

相关链接：

http://stackoverflow.com/questions/17885141/cant-add-service-reference-to-new-console-app

WCF 同一个解决方案中控制台应用添加服务引用报错