WCF服务正在调试但在从android调用时无法正常工作

I created a WCF service in Visual Studio 2012 that I intend to consume in Xamarin and have it save user registration information to a table in SQL server. The service works fine when debugging in Visual Studio, the data entries actually save to my table in SQL. I want to consume the service in Xamarin and here is my code:I created a WCF service in Visual Studio 2012 t