Thursday, October 08, 2020

Calling REST API in C# (Read JSON Data)

 How to post JSON to a server using C#?

OR

 Calling REST API in C# (Read JSON Data) 


Sample Code C#:

var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://url");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";

using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
    string json = "{\"user\":\"test\"," +
                  "\"password\":\"bla\"}";

    streamWriter.Write(json);
}

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

//*************************************************************************//

 var httpWebRequest = (HttpWebRequest)WebRequest.Create("YOU API URL");
            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Method = "POST";
            httpWebRequest.Headers.Add("APIKey", "111111111111111111");
            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                string json = JsonConvert.SerializeObject(new
                {
                    appId = "XXXX",
                    vehicleRequestChoice = new
                    {
                        plateDetails = new
                        {
                            plateCategory = "Private",
                            plateCode = "T",
                            plateNo = "11111" 
                        }
                    }
                }
                );
                streamWriter.Write(json);
            }
            
            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                if (httpResponse.StatusCode == HttpStatusCode.OK)
                {
                    var result = streamReader.ReadToEnd();
                    var testobj = JsonConvert.DeserializeObject(result);
                    return testobj;
                }
                    


            }
            //***************** END ******************//

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