对WCF服务参数的jQuery调用以null的形式出现

I've got an ASP.NET page that calls a WCF Service using jQuery. The page passes in the contents of a text box control to the service. The service uses this text box value to look up a record and then it returns a POCO to the jQuery to update the contents of a bunch of other controls.I've got an ASP.NET page that calls a WCF Servi