RPCclient.cs

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using System;
using System.IO;
using System.Net;
using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
 
namespace JsonRPCclient {
 
  public class JsonRPCclient {
 
    private int id = 0;
    /// <summary>
    /// Set JSON-RPC webservice URL
    /// </summary>
    public string URL { set; get; }
    /// <summary>
    /// Set JSON-RPC method
    /// </summary>
    public string Method { set; get; }
    /// <summary>
    /// Add JSON-RPC params
    /// </summary>
    public JObject Parameters { set; get; }
 
    /// <summary>
    /// Results of the request
    /// </summary>
    public JsonRPCresponse Response { set; get; }
 
 
    /// <summary>
    /// Create a new object of RPCclient 
    /// </summary>
    public JsonRPCclient() {
      Parameters = new JObject();
      Response = null;
    }
 
    /// <summary>
    /// Create a new object of RPCclient
    /// </summary>
    /// <param name="URL"></param>
    public JsonRPCclient(string URL) {
      this.URL = URL;
      Parameters = new JObject();
      Response = null;
    }
 
    /// <summary>
    /// POST the request and returns server response
    /// </summary>
    /// <returns></returns>
    public string Post() {
      try {
        JObject jobject = new JObject();
        jobject.Add(new JProperty("jsonrpc", "2.0"));
        jobject.Add(new JProperty("id", ++id));
        jobject.Add(new JProperty("method", Method));
        jobject.Add(new JProperty("params", Parameters));
 
        string PostData = JsonConvert.SerializeObject(jobject);
        UTF8Encoding encoding = new UTF8Encoding();
        byte[] bytes = encoding.GetBytes(PostData);
 
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
        request.Method = "POST";
        request.ContentType = "application/json";
        request.KeepAlive = true;
        request.ContentLength = bytes.Length;
 
        Stream writeStream = request.GetRequestStream();
        writeStream.Write(bytes, 0, bytes.Length);
        writeStream.Close();
 
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream responseStream = response.GetResponseStream();
        StreamReader readStream = new StreamReader(responseStream, Encoding.UTF8);
 
        Response = new JsonRPCresponse();
        Response = JsonConvert.DeserializeObject<JsonRPCresponse>(readStream.ReadToEnd());
        Response.StatusCode = response.StatusCode;
 
        return Response.ToString();
      }
      catch (Exception e) {
        return e.ToString();
      }
    }
 
    public void ClearParameters() {
      this.Parameters = new JObject();
    }
 
 
  }
 
  public class JsonRPCresponse {
    public int id { set; get; }
    public object result { set; get; }
    public string error { set; get; }
    public HttpStatusCode StatusCode { set; get; }
 
    public JsonRPCresponse() { }
 
    public override string ToString() {
      return "{\"id\":" + id.ToString() + ",\"result\":\"" + result.ToString() + "\",\"error\":" + error + ((String.IsNullOrEmpty(error)) ? "null" : "\"" + error + "\"") + "}";
    }
  }
 
}

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program.cs



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string Baseurl = "http://localhost/limesurvey/index.php/admin/remotecontrol";
      JsonRPCclient client = new JsonRPCclient(Baseurl);
      client.Method = "get_session_key";
      client.Parameters.Add("username", "admin");
      client.Parameters.Add("password", "mypassword");
      client.Post();
      string SessionKey = client.Response.result.ToString();
 
      client.ClearParameters();
 
      if(client.Response.StatusCode == System.Net.HttpStatusCode.OK){
        client.Method = "import_survey";
        client.Parameters.Add("sSessionKey", SessionKey);
        client.Parameters.Add("sImportData", Base64Encode(yourImportDataString));
        client.Parameters.Add("sImportDataType", "lss");
        //client.Parameters.Add("sNewSurveyName", "test");
        //client.Parameters.Add("DestSurveyID", 999333);
        client.Post();
      }
 
      client.ClearParameters();
 
      Console.WriteLine("new survey id:" + client.Response.result.ToString());
      Console.ReadLine();