How to post data to a WCF service

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C#

WCF

JSON

Hi,

I have a client from which I am trying to POST data to a Rest based WCF server in JSON format and my data object on the server side is getting null value.

Here is the code snippet for Client:

public class DeviceData
  {
      public string Id { get; set; }
      public string FirstName { get; set; }
      public string LastName { get; set; }
  }

var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://localhost:62570/BLEService.svc/SaveDeviceDetails");
          httpWebRequest.ContentType = "application/json";
          httpWebRequest.Method = "POST";

          var serializer = new Newtonsoft.Json.JsonSerializer();
          using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
          {
              using (var tw = new Newtonsoft.Json.JsonTextWriter(streamWriter))
              {
                  serializer.Serialize(tw,
                      new
                      {
                          method = "SaveDeviceDetails",
                          @params = new DeviceData{FirstName = "abc",Id = "7", LastName = "def"}
                      });
              }

          }
          var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
          using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
          {
              var responseText = streamReader.ReadToEnd();

          }

Here is my Server Implementation:

IBLEService.cs

[OperationContract]
       [WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json,
           BodyStyle = WebMessageBodyStyle.Wrapped,UriTemplate = "SaveDeviceDetails")]
       bool SaveDeviceDetails(DeviceData data);

BLEService:IBLEService (Interface Implementation)

bool IBLEService.SaveDeviceDetails(DeviceData data)
    {
        try
        {
       
            System.IO.File.WriteAllText("C:\\Device.txt", data.FirstName + " " + data.LastName + " " + data.Id);
        }
        catch (Exception ex)
        {
            throw new FaultException<string>
                    (ex.Message);
        }
        return true;
    }

DeviceData.cs in Server

[DataContract]
    public class DeviceData
    {
        [DataMember(Name = "Id")]
        public string Id { get; set; }

        [DataMember(Name = "FirstName")]
        public string FirstName { get; set; }

        [DataMember(Name = "LastName")]
        public string LastName { get; set; }

    }

Here the data in server I m getting as NULL , any help will be appreciated Thanks.