WCF数据服务存储过程返回奇怪的字符串值

存储过程：

ALTER PROCEDURE [dbo].[TestDataSP]
AS 
BEGIN
    SELECT FirstName 
    FROM Employees 
    WHERE EmployeeID = 7
END

TaskTrackerDataService.cs

[WebGet]
public String GetEmployeeName()
{
    TaskTracker_EDM.TaskTrackerEntities ctx = new TaskTracker_EDM.TaskTrackerEntities();
    return ctx.TestDataSP().FirstOrDefault(); 
}

我有一个存储过程，我可以从Web调用它

http:localhost:2402/TaskTrackerDataService.svc/GetEmployeeName

它将返回员工姓名

<GetEmployeeName xmlns="http://schemas.microsoft.com/ado/2007/08/dataservices">Keko88</GetEmployeeName>

任何帮助，请

错误是 始终返回“System.Data.Services.Client.QueryOperationResponse`1[System.String]”

因此，添加single，它将正确返回字符串结果

字符串emps1=ctxDSvc.Execute（新Uri（“http:localhost:2402/TaskTrackerDataService.svc/GetEmployeeName”））.Single（）

错的是 字符串emps1=ctxDSvc.Execute（新Uri（“http:localhost:2402/TaskTrackerDataService.svc/GetEmployeeName”））.ToString（）

TaskTrackerDataService.TaskTrackerEntities ctxDSvc =  new TaskTrackerDataService.TaskTrackerEntities(new Uri("http:localhost:2402/TaskTrackerDataService.svc"));

String emps1 = ctxDSvc.Execute<String>(new Uri("http:localhost:2402/TaskTrackerDataService.svc/GetEmployeeName")).ToString();

Console.WriteLine(string.Format("ID: {0} ==== ==== ====  ", emps1));

"System.Data.Services.Client.QueryOperationResponse`1[System.String]"