call Web Api POST

Question

User-1471881183 posted

hello all,

i have a web api to post data, its like below, i want to call and post data from windows service. may i know how to achieve this?

// POST: api/PosttblEmployee
        [ResponseType(typeof(tblEmployee))]
        [Route("api/PosttblEmployee")]
        public IHttpActionResult PosttblEmployee(tblEmployee tblEmployee)
        {
            try
            {
                tblEmployee.addDate = Convert.ToDateTime(DateTime.Now.ToString());
                tblEmployee.addUserId = 1;
                var errors = ModelState
                                .Where(x => x.Value.Errors.Count > 0)
                                .Select(x => new { x.Key, x.Value.Errors })
                                .ToArray();
                if (!ModelState.IsValid)
                {
                    //return BadRequest(ModelState);
                }

                db.tblEmployees.Add(tblEmployee);
                db.SaveChanges();
                return ResponseMessage(Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "Pass"));
            }
	catch (Exception ex)
            {
                return ResponseMessage(Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "Fail"));
            }
        }

Answer 1

User475983607 posted

Use the HttpClient.  The following link explains the details.

https://docs.microsoft.com/en-us/aspnet/web-api/overview/advanced/calling-a-web-api-from-a-net-client

Answer 2

User-1171043462 posted

Refer

Call (Consume) Web API in Windows Forms Application using C#

Answer 3

User36583972 posted

Hi winseealn,

i have a web api to post data, its like below, i want to call and post data from windows service. may i know how to achieve this?

The following methods for your reference.

HttpClient:

   using (var client = new System.Net.Http.HttpClient())
            {
                // HTTP POST
                client.BaseAddress = new Uri("baseUrl");
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
  
                var content = new StringContent(JsonConvert.SerializeObject(new tblEmployee()), Encoding.UTF8, "application/json");
                var response = client.PostAsync("/api/PosttblEmployee", content).Result;
                string s = await response.Content.ReadAsStringAsync();
            }

HttpWebRequest:

     //using System.Net;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("your api address/api/PosttblEmployee");
            request.Method = "POST";
            request.KeepAlive = true;
            request.ContentType = "application/json; charset=utf-8";
           
            // write the data to the request stream         
            using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
            {
                string PostData = new JavaScriptSerializer().Serialize(new tblEmployee());
                writer.Write(PostData);
            }

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            string myResponse = "";
            using (System.IO.StreamReader sr = new System.IO.StreamReader(response.GetResponseStream()))
            {
                myResponse = sr.ReadToEnd();
            }

Best Regards,

Yong Lu