How to consume rest api in C#

Question

I want to consume rest api having post method in my project (web)/Windows service(C#).

Url : https://sampleurl.com/api1/token

I need to pass username and password for generating token. I have written code like this.

string sURL = "https://sampleurl.com/api1/token/Actualusername/Actualpassword";
            WebRequest wrGETURL;
            wrGETURL = WebRequest.Create(sURL);

            wrGETURL.Method = "POST";
            wrGETURL.ContentType = @"application/json; charset=utf-8";
            wrGETURL.ContentLength = 0;
            HttpWebResponse webresponse = wrGETURL.GetResponse() as HttpWebResponse;

            Encoding enc = System.Text.Encoding.GetEncoding("utf-8");
            // read response stream from response object
            StreamReader loResponseStream = new StreamReader(webresponse.GetResponseStream(), enc);
            // read string from stream data
            string  strResult = loResponseStream.ReadToEnd();
            // close the stream object
            loResponseStream.Close();
            // close the response object
            webresponse.Close();

            Response.Write(strResult);

I am getting error: No connection could be made because the target machine actively refused it

Is it right way to consume rest api in C#?

Solution

This all very much depend on the API's documentation, but to write data to the request body, get the request stream and then write the string to the stream. again, this depends on what the API you are authenticating with and without knowing which one is guesswork on my part.

        string sURL = "https://sampleurl.com/api1/token";
        WebRequest wrGETURL;
        wrGETURL = WebRequest.Create(sURL);

        wrGETURL.Method = "POST";
        wrGETURL.ContentType = @"application/json; charset=utf-8";
        using (var stream = new StreamWriter(wrGETURL.GetRequestStream()))
        {
            var bodyContent = new
            {
                username = "Actualusername",
                password = "Actualpassword"
            }; // This will need to be changed to an actual class after finding what the specification sheet requires.

            var json = JsonConvert.SerializeObject(bodyContent);

            stream.Write(json);
        }
        HttpWebResponse webresponse = wrGETURL.GetResponse() as HttpWebResponse;

        Encoding enc = System.Text.Encoding.GetEncoding("utf-8");
        // read response stream from response object
        StreamReader loResponseStream = new StreamReader(webresponse.GetResponseStream(), enc);
        // read string from stream data
        string strResult = loResponseStream.ReadToEnd();
        // close the stream object
        loResponseStream.Close();
        // close the response object
        webresponse.Close();

        Response.Write(strResult);

Comments

[Jui Test]

I am using third party Rest api which made in PHP having post method.I don't know apart from this any other specification.

[Jui Test]

Thanks Robjam for your help.Let me checked with ur code and revert u back.

[Sir Rufo]

@JuiTest An API needs documentation. As a real world example this reads like "How to use my red car?"

[Jui Test]

Thanks Robjam for code.I used ur code.I am getting Error :'An existing connection was forcibly closed by the remote host '

[robjam]

I can't really help anymore unless I can see the documentation.