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POList of user-defined objects from Android to an ASP.NET webservice through JSON
 

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  1. POList of user-defined objects from Android to an ASP.NET webservice through JSON
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    <p>I have a web service written in ASP.NET that accepts a List of type Contact(<strong>List</strong>).</p> <pre><code> [WebMethod] [ScriptMethod(ResponseFormat = ResponseFormat.Json)] #region List of contacts that need to be created in the database. public List&lt;KeyValue&gt; createRecordsInDb(List&lt;Contact&gt; dataToPass) { return Contact.insertArrayIntoDb(dataToPass); } #endregion </code></pre> <p>On the android device, I am converting a <strong>List</strong> to a <strong>String</strong> using the GSON library.</p> <pre><code> List&lt;Contact&gt; lstContactsToCreate= retrieveDataFromCursor(cursor,false); String jsonString = new Gson().toJson(lstContactsToCreate); try { callWebService(jsonString, _context.getResources().getString(R.string.updateCreateURL), false); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (NotFoundException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } </code></pre> <p>The problem arises when I wish to send the data to the web-service. I'm passing the data through the following method,</p> <pre><code>private HttpResponse callWebService(String dataToPass, String URL, boolean isUpdate) throws JSONException, ClientProtocolException, IOException{ HttpPost httpPost = new HttpPost(URL); httpPost.setHeader("content-type", "application/json"); HttpClient httpClient = new DefaultHttpClient(getHttpParameterObj(4000,4000)); // Building the JSON object. JSONObject data = new JSONObject(); data.put("dataToPass", dataToPass); StringEntity entity = new StringEntity(data.toString(), HTTP.UTF_8); entity.setContentType("application/json"); entity.setContentEncoding( "UTF-8"); httpPost.setEntity(entity); // Making the call. HttpResponse response = httpClient.execute(httpPost); return response; } </code></pre> <p>Whenever I call the webservice, it throws the following error - </p> <pre><code>{"Message":"Cannot convert object of type \u0027System.String\u0027 to type \u0027System.Collections.Generic.List`1 </code></pre> <p>The problem is that <code>data.toString()</code> returns :-</p> <pre><code>{"dataToPass":"[{\"address\":\"Himayath Nagar\",\"email\":\"abijeet.p@osmosys.asia\",\"name\":\"Abijeet Patro\",\"server_id\":\"\",\"status\":\"\"},{\"address\":\"himayath naga\",\"email\":\"saravana.e@osmosys.asia\",\"name\":\"Saravana\",\"server_id\":\"\",\"status\":\"\"},{\"address\":\"hellpo world\",\"email\":\"asshole@gmail.com\",\"name\":\"Syai\",\"server_id\":\"\",\"status\":\"\"}]"} </code></pre> <p>whereas the webservice expects data in the format</p> <pre><code>{"dataToPass":[{\"address\":\"Himayath Nagar\",\"email\":\"abijeet.p@osmosys.asia\",\"name\":\"Abijeet Patro\",\"server_id\":\"\",\"status\":\"\"},{\"address\":\"himayath naga\",\"email\":\"saravana.e@osmosys.asia\",\"name\":\"Saravana\",\"server_id\":\"\",\"status\":\"\"},{\"address\":\"hellpo world\",\"email\":\"asshole@gmail.com\",\"name\":\"Syai\",\"server_id\":\"\",\"status\":\"\"}]} </code></pre> <p>I even tried replacing and removing those " " as such :- </p> <pre><code>data.toString().replace("\"[","[").replace("]\"","]"); (java.lang.String) {"dataToPass":[{\"address\":\"Himayath Nagar\",\"email\":\"abijeet.p@osmosys.asia\",\"name\":\"Abijeet Patro\",\"server_id\":\"\",\"status\":\"\"},{\"address\":\"himayath naga\",\"email\":\"saravana.e@osmosys.asia\",\"name\":\"Saravana\",\"server_id\":\"\",\"status\":\"\"},{\"address\":\"hellpo world\",\"email\":\"asshole@gmail.com\",\"name\":\"Syai\",\"server_id\":\"\",\"status\":\"\"}]} </code></pre> <p>But that does not seem to be working as the Web Server throws an error</p> <pre><code>{"Message":"Invalid object passed in, member name expected. (16): {\"dataToPass\":[{\\\"address\\\":\\\"Himayath Nagar\\\",\\\"email\\\":\\\"abijeet.p@osmosys.asia\\\",\\\"name\\\":\\\"Abijeet Patro\\\",\\\"server_id\\\":\\\"\\\",\\\"status\\\":\\\"\\\"},{\\\"address\\\":\\\"himayath naga\\\",\\\"email\\\":\\\"saravana.e@osmosys.asia\\\",\\\"name\\\":\\\"Saravana\\\",\\\"server_id\\\":\\\"\\\",\\\"status\\\":\\\"\\\"},{\\\"address\\\":\\\"hellpo world\\\",\\\"email\\\":\\\"asshole@gmail.com\\\",\\\"name\\\":\\\"Syai\\\",\\\"server_id\\\":\\\"\\\",\\\"status\\\":\\\"\\\"}]}","StackTrace":" at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeDictionary(Int32 depth)\r\n at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)\r\n at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeList(Int32 depth)\r\n at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)\r\n at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeDictionary(Int32 depth)\r\n at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)\r\n at System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer)\r\n at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit)\r\n at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize[T](String input)\r\n at System.Web.Script.Services.RestHandler.GetRawParamsFromPostRequest(HttpContext context, JavaScriptSerializer serializer)\r\n at System.Web.Script.Services.RestHandler.GetRawParams(WebServiceMethodData methodData, HttpContext context)\r\n at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.ArgumentException"} </code></pre> <p>So how do I pass an array of user-defined objects from Java to my ASP.NET web service? Or is there way I can convert the GSON string on the asp.net web server to my List objects?</p> <p>Can I use JSON.NET to de-serialize the string to my List?</p>
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