Serialising and deserialising a JSON object returned by an ASP.Net web service - asp.net

Question

I have a simple ASP.Net web service / script method that returns a JSON object which is then modified and send back to the page during post back - I need to be able to deserialise this object:
public class MyWebPage : Page
{
[WebMethod]
[ScriptMethod]
public static MyClass MyWebMethod()
{
// Example implementation of my web method
return new MyClass()
{
MyString = "Hello World",
MyInt = 42,
};
}
protected void myButton_OnClick(object sender, EventArgs e)
{
// I need to replace this with some real code
MyClass obj = JSONDeserialise(this.myHiddenField.Value);
}
}
// Note that MyClass is contained within a different assembly
[Serializable]
public class MyClass : IXmlSerializable, ISerializable
{
public string MyString { get; set; }
public int MyInt { get; set; }
// IXmlSerializable and ISerializable implementations not shown
}
I can make changes to both the web method MyWebMethod, and also to a certain extent MyClass, however MyClass needs to implemnt both IXmlSerializable and ISerializable, and is contained within a separate assembly - I mention this because these have caused problems for me so far.
How can I do this? (either using standard .Net types or using something like JSON.Net)

Answer 1

You can use JavaScriptSerializer class from System.Web.Extensions to deserialize JSON string. For example, the following code converts hash into .NET dictionary object:
using System;
using System.Collections.Generic;
using System.Web.Script.Serialization;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
var dict = new JavaScriptSerializer().Deserialize<Dictionary<string,int>>("{ a: 1, b: 2 }");
Console.WriteLine(dict["a"]);
Console.WriteLine(dict["b"]);
Console.ReadLine();
}
}
}
Code output is:
1
2

Answer 2

JavaScriptSerializer is the class that static page methods use to serialize their responses, so it's also what's appropriate for deserializing that particular JSON:
protected void myButton_OnClick(object sender, EventArgs e)
{
string json = myHiddleField.Value;
MyClass obj = new JavaScriptSerializer().Deserialize<MyClass>(json);
}