Create Json dynamically in c#

I need to create a Json object dynamically by looping through columns.
so declaring an empty json object then add elements to it dynamically.

eg:

List<String> columns = new List<String>{"FirstName","LastName"};

var jsonObj = new {};

for(Int32 i=0;i<columns.Count();i++)
    jsonObj[col[i]]="Json" + i;

And the final json object should be like this:

jsonObj={FirstName="Json0", LastName="Json1"};

Answers:

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Method 1

[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}
    }
}

Method 2

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 }

Method 3

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"}

Method 4

Using dynamic and JObject

dynamic product = new JObject();
product.ProductName = "Elbow Grease";
product.Enabled = true;
product.StockCount = 9000;

Console.WriteLine(product.ToString());
// {
//   "ProductName": "Elbow Grease",
//   "Enabled": true,
//   "StockCount": 9000
// }

Or how about:

JObject obj = JObject.FromObject(new
{
    ProductName = "Elbow Grease",
    Enabled = true,
    StockCount = 9000
});

Console.WriteLine(obj.ToString());
// {
//   "ProductName": "Elbow Grease",
//   "Enabled": true,
//   "StockCount": 9000
// }

https://www.newtonsoft.com/json/help/html/CreateJsonDynamic.htm

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0