Create Json dynamically in c#

[TestFixture]public class DynamicJson{    [Test]    public void Test()    {        dynamic flexible = new ExpandoObject();        flexible.Int = 3;        flexible.String = "hi";        var dictionary = (IDictionary<string, object>)flexible;        dictionary.Add("Bool", false);        var serialized = JsonConvert.SerializeObject(dictionary); // {"Int":3,"String":"hi","Bool":false}    }}

I found a solution very similar to DPeden, though there is no need to use the IDictionary, you can pass directly from an ExpandoObject to a JSON convert:

dynamic foo = new ExpandoObject();foo.Bar = "something";foo.Test = true;string json = Newtonsoft.Json.JsonConvert.SerializeObject(foo);

and the output becomes:

{ "FirstName":"John", "LastName":"Doe", "Active":true }

You should use the JavaScriptSerializer. That can Serialize actual types for you into JSON :)

Reference: http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx

EDIT: Something like this?

var columns = new Dictionary<string, string>            {                { "FirstName", "Mathew"},                { "Surname", "Thompson"},                { "Gender", "Male"},                { "SerializeMe", "GoOnThen"}            };var jsSerializer = new JavaScriptSerializer();var serialized = jsSerializer.Serialize(columns);

Output:

{"FirstName":"Mathew","Surname":"Thompson","Gender":"Male","SerializeMe":"GoOnThen"}