Question

我已经创建了一个WCF RESTful Service方法，如下所示：Id为101和102

public EmployeeJSON GetEmployeeJSON(string id)
    {
        List<EmployeeJSON> employees = new List<EmployeeJSON>()
        {
             new EmployeeJSON() {Name="Sumanth",Id=101,Salary=5000.00 },
             new EmployeeJSON() {Name="Ehsan",Id=102,Salary=6000.00 },
        };

        var Employee = (from x in employees
                        where x.Id.ToString() == id
                        select x);


        return Employee as EmployeeJSON;
    }

在任何时间点，对于传递的Id值，我将从客户端

获得1条记录

声明如下

[OperationContract]
    [WebInvoke(Method = "GET", UriTemplate = "GetJson/{id}", ResponseFormat = WebMessageFormat.Json, RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped)]
    EmployeeJSON GetEmployeeJSON(string id);

客户端代码如下所示

protected void btn_Click(object sender, EventArgs e)
    {
        var request = (HttpWebRequest)WebRequest.Create("http://localhost:1249/Service1.svc/GetJson/101");
        HttpWebResponse response = request.GetResponse() as HttpWebResponse;
        Stream stream = response.GetResponseStream();
        StreamReader reader = new StreamReader(stream);
        txtEmpId.Text = reader.ReadToEnd();
    }

对于101和102以及任何参数值说100，它总是返回错误，如下所示

{"GetEmployeeJSONResult":null}

无法弄明白为什么......

Answer 1

对于此函数public EmployeeJSON GetEmployeeJSON(string id)，返回类型的更改如下所示

return Employee.FirstOrDefault() as EmployeeJSON;

WCF RESTful服务始终返回null

1 个答案: