I need to get Json data from a C# web service.
I know there are several questions based on this, trust me I have read through quite a few but only to confuse me further.
This is what I have done :
In my web service I have included : [System.Web.Script.Services.ScriptService]
for the class & [ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = true)]
for the method
I have also used a JavaScriptSerializer()
to convert my data to a string
I am calling this service using $.getJSON()
If I don't use that I get an Cross domain reference error.
To do this I had to setup m service to get the callback function name
so I am passing this.Context.Request["callback"]
+ serialized Json Data;
But in the output I get it wrapped in
< string xmlns="http://XYZ...">
The data within the tags is in the format I need
I also tried setting content type using : $.ajaxSetup({ scriptCharset: "utf-8" , contentType: "application/json; charset=utf-8"});
But still no success.
Addded later: I accepted frenchie's anwser beacuse I know it is the correct approach but I stil cud not get it to work... I just put the webservice & website in the same domain & used xml, I know it wasnt the best way, but I had spent 2 days on it & could not afford to waste more.
Use this:
var JsonString = ....;
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "YourWebServiceName.asmx/yourmethodname",
data: "{'TheData':'" + JsonString + "'}",
dataType: "json",
success: function (msg) {
var data = msg.hasOwnProperty("d") ? msg.d : msg;
OnSucessCallBack(data);
},
error: function (xhr, status, error) {
alert(xhr.statusText);
}
});
function OnSuccessCallData(DataFromServer) {
// your handler for success
}
and then on the server side, in the code behind file that's auto-generated in your AppCode folder, you write something like this:
using System.Web.Services;
using System.Web.Script.Serialization;
[System.Web.Script.Services.ScriptService]
public class YourWebServiceName : System.Web.Services.WebService
{
[WebMethod]
public string yourmethodname(string TheData)
{
JavascriptSerializer YourSerializer = new JavascriptSerializer();
// custom serializer if you need one
YourSerializer.RegisterConverters(new JavascriptConverter [] { new YourCustomConverter() });
//deserialization
TheData.Deserialize(TheData);
//serialization
TheData.Serialize(TheData);
}
}
If you don't use a custom converter, the properties between the json string and the c# class definition of your server-side object must match for the deserialization to work. For the serialization, if you don't have a custom converter, the json string will include every property of your c# class. You can add [ScriptIgnore]
just before a property definition in your c# class and that property will be ignored by the serializer if you don't specify a custom converter.