Question

How do I map JSON object to C# object ?

  var Data = JSON.stringify({
                    FirstName: "sdfsdf",
                    LastName: "sdfsdf", Age: "sdfsdf", Descrp: "sdfsdf"
                });

for example converting Data to C# class with same properties.
I tried this :

 var Data = JSON.stringify({
                FirstName: "sdfsdf",
                LastName: "sdfsdf", Age: "sdfsdf", Descrp: "sdfsdf"
            });
            $.ajax({
                type: "POST",
                url: "Services/CRUD.asmx/CreatePerson",
                data: Data,
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (msg) {
                    alert(msg.d);

                }
            });

but when I checked with firebug this error returned :

{"Message":"Invalid web service call, missing value for parameter: \u0027PersonObj\u0027.","StackTrace":"   at System.Web.Script.Services.WebServiceMethodData.CallMethod(Object target, IDictionary`2 parameters)\r\n   at System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)\r\n   at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary`2 rawParams)\r\n   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.InvalidOperationException"}

Answer 1

You can definitely do that, but you need to make sure the client-side object matches your server-side class structure, property names, and parameter name exactly.

It sounds like your server-side method is expecting a PersonObj parameter, but you aren’t structuring it that way on the client-side. Try something like this:

var Data = JSON.stringify({ 
  PersonObj: {
    FirstName: 'foo',
    LastName: 'bar',
    Age: 99,
    Descrp: 'foo person'
  }
});   

I’ve written about doing this in-depth here: http://encosia.com/using-complex-types-to-make-calling-services-less-complex/