ASP.NET MVC4 Web API Controller should return json result which contains numeric propery names and values like

{ "openTimes":{"1":"09:00","2":"09:15","3":"09:30" }}

Propery names start with 1 . Number of properties and propery values are created in code.

How to return such result ?

I tried 

class output
{
    [Newtonsoft.Json.JsonProperty("1")]
    public string prop1 { get; set; }
    [Newtonsoft.Json.JsonProperty("2")]
    public string prop2 { get; set; }
    [Newtonsoft.Json.JsonProperty("3")]
    public string prop3 { get; set; }
}

public HttpResponseMessage Post()
{
    return Request.CreateResponse(HttpStatusCode.OK, new
    {
        openTimes = new output() { prop1 = "09:00", prop2 = "09:15", prop3 = "09:30" }
    });
}

but in this code number of elements in list is hard coded. How to return variable-length list ?

as your keys are not legal in .net, use the jsontextwriter.

prepare the dictionary<string,object> object and add all your properties as keys and values as values
convert dictionary to json and send to client

http://stackoverflow.com/questions/22105722/serialize-an-object-w-dictionary-to-json

then at client, you can read json data in jquery like this

$.each( obj, function( key, value ) {

  alert( key + ": " + value );

});