using Newtonsoft.Json;

using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using System.Net.Http;

using System.Net.Http.Headers;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

​

namespace AA10

{

    class Program

    {

        static async Task Main(string[] args)

        {

            var result = await LoginAsync(new LoginRequestDto()

            {

                Account = "user1",

                Password = "123"

            });

            Console.WriteLine(result);

        }

        private static async Task<string> LoginAsync(LoginRequestDto loginRequestDto)

        {

            string result = "";

            using (LoggingHandler loggingHandler = new LoggingHandler(new HttpClientHandler()))

            {

                using (HttpClient client = new HttpClient(loggingHandler))

                {

                    string endPoint = $"https://localhost:5001/api/GetParameter/FromBody";

                    HttpResponseMessage response = null;

​

                    #region 使用 JSON (Raw > JSON) 產生要 Post 的資料

                    // Accept 用於宣告客戶端要求服務端回應的文件型態 (底下兩種方法皆可任選其一來使用)

                    //client.DefaultRequestHeaders.Accept.TryParseAdd("application/json");

                    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

​

                    // Content-Type 用於宣告遞送給對方的文件型態

                    client.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json");

​

                    var fooJSON = JsonConvert.SerializeObject(loginRequestDto);

                    #endregion

​

                    // https://msdn.microsoft.com/zh-tw/library/system.net.http.stringcontent(v=vs.110).aspx

                    using (var fooContent = new StringContent(fooJSON, Encoding.UTF8, "application/json"))

                    {

                        response = await client.PostAsync(endPoint, fooContent);

                    }

​

                    result = await response.Content.ReadAsStringAsync();

                }

            }

            return result;

        }

    }

​

    #region MyRegion

    public class LoggingHandler : DelegatingHandler

    {

        public LoggingHandler(HttpMessageHandler innerHandler)

            : base(innerHandler)

        {

        }

​

        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,

            CancellationToken cancellationToken = default(CancellationToken))

        {

            Console.WriteLine(new String('-', 40));

            Console.WriteLine("      " + "Request:");

            Console.WriteLine("              " + request.ToString());

            if (request.Content != null)

            {

                Console.WriteLine("              " + await request.Content.ReadAsStringAsync());

            }

            Console.WriteLine(new String('-', 40));

            Console.WriteLine("");

​

            HttpResponseMessage response = await base.SendAsync(request, cancellationToken);

​

            Console.WriteLine(new String('-', 40));

            Console.WriteLine("      " + "Response:");

            Console.WriteLine("              " + response.ToString());

            if (response.Content != null)

            {

                Console.WriteLine("              " + await response.Content.ReadAsStringAsync());

            }

            Console.WriteLine(new String('-', 40));

            Console.WriteLine("");

​

            return response;

        }

    }

    #endregion

​

    #region 呼叫 Web API 會用到的類別

    public class LoginRequestDto

    {

        [Required]

        public string Account { get; set; }

        [Required]

        public string Password { get; set; }

    }

    #endregion

}

​