Question

What is the best way to convert a JSON object into query strings to append to a GET URL? The POST is straightforward and gets read by my web API backend.

{Name: 'Mike' } = ?Name=Mike

private static string MakeRequest(HttpWebRequest req, string data)
{
    try
    {
        if (req.Method == Verbs.POST.ToString() || req.Method == Verbs.PUT.ToString() || req.Method == Verbs.DELETE.ToString())
        {
            var encodedData = Encoding.UTF8.GetBytes(data);

            req.ContentLength = encodedData.Length;
            req.ContentType = "application/json";
            req.GetRequestStream().Write(encodedData, 0, encodedData.Length);
        }

        using (var response = req.GetResponse() as HttpWebResponse)
        using (var reader = new StreamReader(response.GetResponseStream()))
        {
            return reader.ReadToEnd();
        }
    }
    catch (WebException we)
    {
        if(we.Response == null)
        {
            return JsonConvert.SerializeObject(new { Errors = new List<ApiError> { new ApiError(11, "API is currently unavailable") }});
        }

        using (var response = we.Response as HttpWebResponse)
        using (var reader = new StreamReader(response.GetResponseStream()))
        {
            return reader.ReadToEnd();
        }
    }
}

Answer 1

If the json object is flat as in your example, then

string json = @"{
    ""name"": ""charlie"",
    ""num"": 123
}";

var jObj = (JObject)JsonConvert.DeserializeObject(json);

var query = String.Join("&",
                jObj.Children().Cast<JProperty>()
                .Select(jp=>jp.Name + "=" + HttpUtility.UrlEncode(jp.Value.ToString())));

query would be name=charlie&num=123