WebAPI发布请求

Question

我有Windows应用程序，该应用程序使用Web客户端调用WebAPi。

问题：

当我们托管Web服务并从Visual Studio运行的Windows应用程序中调用它时，它可以正常工作。但是，当我们将应用程序发送到另一台笔记本电脑时，WEbAPI会将参数接收为null。

Windows应用程序功能：

    public static DataSet Add(DataTable data, DataTable settings, string username, string pwd)
    {
        DataSet Result = new DataSet();
        try
        {
            using (WebClient client = new WebClient())
            {
                client.Headers[HttpRequestHeader.ContentType] = "application/json";
                client.Headers[HttpRequestHeader.Authorization] = string.Format("Basic {0}", Convert.ToBase64String(Encoding.ASCII.GetBytes(username + ":" + pwd)));

                DataSet set = new DataSet("parameter");
                set.Tables.Add(data.Copy());
                set.Tables.Add(settings.Copy());

                string param_value = JsonConvert.SerializeObject(set);
                string result = client.UploadString("http://localhost:3535/Add", param_value);

                JsonResult value = JsonConvert.DeserializeObject<JsonResult>(result);
                if (value.Data != null)
                    Result = JsonConvert.DeserializeObject<DataSet>(value.Data.ToString());
            }
        }
        catch (Exception err)
        {
        }
        return Result;
    }

WEB API函数：

    [BasicAuthentication]
    [System.Web.Http.HttpPost]
    public JsonResult Add([FromBody] JObject parameter)
    {
        JsonResult Result = new JsonResult();
        try
        {
            DataTable Data = new DataTable();
            DataSet set = new DataSet("response");
            DataSet DataSetResult = parameter.ToObject<DataSet>();
            DataTable values = Add(DataSetResult.Tables[0], DataSetResult.Tables[1], out Data);
            set.Tables.Add(Data.Copy());
            set.Tables.Add(values.Copy());

            Result.Data = set;
            Result.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
        }
        catch (Exception err)
        {
        }
        return Result;
    }