how to send POST json from C# to asp.net web api

Question

How is it possible to make a POST request to ASP.Net web api from C#. I have used Newtonsoft dll files to create the json, but, I am not able to send it to the api.

My code is :

        Login login = new Login
        {
            userid = username.Text,
            pass = pass.Text
        };
        string json = JsonConvert.SerializeObject(login, Formatting.Indented);

How to send this json to web api, and get a response ?

Edit

string url = "myurl";


        var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.ContentType = "application/json; charset=utf-8";
        httpWebRequest.Method = "POST";
        httpWebRequest.Accept = "application/json; charset=utf-8";

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {

            json = json.Replace("\r\n","");
            //json = json.Replace("\",", "\","   + "\"" +"\u002B");
            streamWriter.Write(json);
            streamWriter.Flush();
            streamWriter.Close();
        }

        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
            pass.Text = result.ToString();
        }

I would use WebClient. There are tons of examples on StackOverflow how to use it. It's less involved than HttpWebRequest — Lotok
– Lotok, Commented Jul 14, 2014 at 6:40

Roshan · Accepted Answer · 2014-07-14 06:44:35Z

I made it work, by having a few edits. Instead of directly serializing the json object, I used a class, and assigned values to it, and serialized it using JavaScriptSerializer. Thanks for your help Shekhar.

        var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.ContentType = "application/json; charset=utf-8";
        httpWebRequest.Method = "POST";
        httpWebRequest.Accept = "application/json; charset=utf-8";

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            string loginjson = new JavaScriptSerializer().Serialize(new
            {
                userid = username.Text,
                password = pass.Text
            });

            streamWriter.Write(loginjson);
            streamWriter.Flush();
            streamWriter.Close();

            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                var result = streamReader.ReadToEnd();
                pass.Text = result.ToString();
            }
        }

शेखर · Accepted Answer · 2014-07-14 06:33:06Z

3

You can use HttpWebRequest class to create a request and use StreamWriter to write your Json with the request and finally get HttpWebResponse from the Web API.

var httpWebRequest = (HttpWebRequest)WebRequest.Create("path/api");
httpWebRequest.ContentType = "text/json";
httpWebRequest.Method = "POST";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
   streamWriter.Write(json);
   streamWriter.Flush();
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();

answered Jul 14, 2014 at 6:33

शेखर

17.6k14 gold badges64 silver badges123 bronze badges

2 Comments

Roshan Over a year ago

I did this already. But I am not getting success message as false. Please see the edit.

Roshan Over a year ago

Success:false was the message I used to get. I made it work. I am posting it as an answer.

Collectives™ on Stack Overflow

how to send POST json from C# to asp.net web api

2 Answers 2

Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related