Check if Key existed in the JsonData Object of LitJSON (A C# JSON Parser) source: http://goo.gl/NxBcP

new_gist_file

static public  bool JsonDataContainsKey(JsonData data,string key)
    {
        bool result = false;
        if(data == null)
            return result;
        if(!data.IsObject)
        {
            return result;
        }
        IDictionary tdictionary = data as IDictionary;
        if(tdictionary == null)
            return result;
        if(tdictionary.Contains(key))
        {
            result = true;
        }
        return result;
    }

thank you

a much simpler way :
data.Keys.Contains(key)

<3