ASP.NET JSON Web Service Response format - service

Question

I have written one simple web service which get product list in JSONText which is string object
Web Service code is below
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Services;
using System.Web.Script.Services;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;
/// <summary>
/// Summary description for JsonWebService
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class JsonWebService : System.Web.Services.WebService
{
public JsonWebService () {
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public string GetProductsJson(string prefix)
{
List<Product> products = new List<Product>();
if (prefix.Trim().Equals(string.Empty, StringComparison.OrdinalIgnoreCase))
{
products = ProductFacade.GetAllProducts();
}
else
{
products = ProductFacade.GetProducts(prefix);
}
//yourobject is your actula object (may be collection) you want to serialize to json
DataContractJsonSerializer serializer = new DataContractJsonSerializer(products.GetType());
//create a memory stream
MemoryStream ms = new MemoryStream();
//serialize the object to memory stream
serializer.WriteObject(ms, products);
//convert the serizlized object to string
string jsonString = Encoding.Default.GetString(ms.ToArray());
//close the memory stream
ms.Close();
return jsonString;
}
}
now it give me resoponse like below :
{"d":"[{\"ProductID\":1,\"ProductName\":\"Product 1\"},{\"ProductID\":2,\"ProductName\":\"Product 2\"},{\"ProductID\":3,\"ProductName\":\"Product 3\"},{\"ProductID\":4,\"ProductName\":\"Product 4\"},{\"ProductID\":5,\"ProductName\":\"Product 5\"},{\"ProductID\":6,\"ProductName\":\"Product 6\"},{\"ProductID\":7,\"ProductName\":\"Product 7\"},{\"ProductID\":8,\"ProductName\":\"Product 8\"},{\"ProductID\":9,\"ProductName\":\"Product 9\"},{\"ProductID\":10,\"ProductName\":\"Product 10\"}]"}
But i am looking for below out put
[{"ProductID":1,"ProductName":"Product 1"},{"ProductID":2,"ProductName":"Product 2"},{"ProductID":3,"ProductName":"Product 3"},{"ProductID":4,"ProductName":"Product 4"},{"ProductID":5,"ProductName":"Product 5"},{"ProductID":6,"ProductName":"Product 6"},{"ProductID":7,"ProductName":"Product 7"},{"ProductID":8,"ProductName":"Product 8"},{"ProductID":9,"ProductName":"Product 9"},{"ProductID":10,"ProductName":"Product 10"}]
can any one tell me what is actual problem
Thanks

Answer 1

First there was a change with ASP.NET 3.5 for security reasons Microsoft added the "d" to the response. Below is a link from Dave Ward at the Encosia that talks about what your seeing:
A breaking change between versions of ASP.NET AJAX. He has several posts that talks about this that can help you further with processing JSON and ASP.NET

Answer 2

Actually, if you just remove the
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
from the method, and you return the jsonString that you serialized using the JavaScriptSerializer you will get exactelly the output that you were looking for.

Answer 3

Notice that u have double quotes beside ur array in your response.In this way u return json format not json object from ur web method.Json format is a string.Therefore u have to use json.parse() function in order to parse json string to json object.If u dont want to use parse fuction,u have to remove serialize in ur web method.Thus u get a json object.

Answer 4

in .net web service
[WebMethod]
public string Android_DDD(string KullaniciKey, string Durum, string PersonelKey)
{
return EU.EncodeToBase64("{\"Status\":\"OK\",\"R\":[{\"ImzaTipi\":\"Paraf\", \"Personel\":\"Ali Veli üğişçöıÜĞİŞÇÖI\", \"ImzaDurumTipi\":\"Tamam\", \"TamamTar\":\"1.1.2003 11:21\"},{\"ImzaTipi\":\"İmza\", \"Personel\":\"Ali Ak\", \"ImzaDurumTipi\":\"Tamam\", \"TamamTar\":\"2.2.2003 11:21\"}]}");
}
static public string EncodeToBase64(string toEncode)
{
UTF8Encoding encoding = new UTF8Encoding();
byte[] bytes = encoding.GetBytes(toEncode);
string returnValue = System.Convert.ToBase64String(bytes);
return returnValue;
}
in android
private static String convertStreamToString(InputStream is)
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try
{
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
try
{
is.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
return sb.toString();
}
private void LoadJsonDataFromASPNET()
{
try
{
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpPost httpPostRequest = new HttpPost(this.WSURL + "/WS.asmx/Android_DDD");
JSONObject jsonObjSend = new JSONObject();
jsonObjSend.put("KullaniciKey", "value_1");
jsonObjSend.put("Durum", "value_2");
jsonObjSend.put("PersonelKey", "value_3");
StringEntity se = new StringEntity(jsonObjSend.toString());
httpPostRequest.setEntity(se);
httpPostRequest.setHeader("Accept", "application/json");
httpPostRequest.setHeader("Content-type", "application/json");
// httpPostRequest.setHeader("Accept-Encoding", "gzip"); // only set this parameter if you would like to use gzip compression
HttpResponse response = (HttpResponse) httpclient.execute(httpPostRequest);
HttpEntity entity = response.getEntity();
if (entity != null)
{
InputStream instream = entity.getContent();
String resultString = convertStreamToString(instream);
instream.close();
resultString = resultString.substring(6, resultString.length()-3);
resultString = new String(android.util.Base64.decode(resultString, 0), "UTF-8");
JSONObject object = new JSONObject(resultString);
String oDurum = object.getString("Status");
if (oDurum.equals("OK"))
{
JSONArray jsonArray = new JSONArray(object.getString("R"));
if (jsonArray.length() > 0)
{
for (int i = 0; i < jsonArray.length(); i++)
{
JSONObject jsonObject = jsonArray.getJSONObject(i);
String ImzaTipi = jsonObject.getString("ImzaTipi");
String Personel = jsonObject.getString("Personel");
String ImzaDurumTipi = jsonObject.getString("ImzaDurumTipi");
String TamamTar = jsonObject.getString("TamamTar");
Toast.makeText(getApplicationContext(), "ImzaTipi:" + ImzaTipi + " Personel:" + Personel + " ImzaDurumTipi:" + ImzaDurumTipi + " TamamTar:" + TamamTar, Toast.LENGTH_LONG).show();
}
}
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
}