Xamarin.forms Call API with JSON input POST method

Add Two Nuget package.
Microsoft.Net.http  and
Newtonsoft.JSON

then call below code in your .cs file


/**url**/
String url = "";

/**create new object of the input json**/


object userInfos = new { employee_id = "-2", employee_code = entry_email.Text, employee_password = entry_pass.Text };
/**serialize input json**/
var jsonObj = JsonConvert.SerializeObject(userInfos);

                using (HttpClient client = new HttpClient())
                {


StringContent content = new StringContent(jsonObj.ToString(), Encoding.UTF8, "application/json");
                    var request = new HttpRequestMessage()
                    {
                        RequestUri = new Uri(url),
                        Method = HttpMethod.Post,
                        Content = content
                    };
                    //you can add headers                
                    //request.Headers.Add("key", "value");
 
                   var response = await client.SendAsync(request);
                    string dataResult = response.Content.ReadAsStringAsync().Result;
     var result = JsonConvert.DeserializeObject<List<RootObject>>(dataResult);

}