使用Object Result在Entity Framework中接收查询（存储过程）？

Question

[HttpPost]
public ActionResult Data (FormCollection form)
{
    int qId = Convert.ToInt32(form["EmailAddress"].ToString());

    using  (var db = new AdventureWorks2014Entities() )
    {
        ObjectResult<GetEmail_Result> em = db.GetEmail(qId);       //error
    }
    //more code downwards

这是错误消息：

  

无法隐式转换类型   ＆＃39; System.Data.Entity.Core.Objects.ObjectResult＆＃39;   至   ＆＃39; System.Data.Objects.ObjectResult＆＃39;

为什么我收到此错误？