/// <summary>
        /// post請(qǐng)求方式
        /// </summary>
        /// <param name="url">請(qǐng)求路徑</param>
        /// <param name="parms">傳入的值，格式為：{city:"上海"，city2:"重慶"}</param>
        /// <param name="token"></param>
        /// <param name="ContentType"></param>
        /// <returns></returns>
        public string HttpPost(string url, string parms, string token,string ContentType= "application/json")
        {
            string result = string.Empty;
            try
            {
                if (url.StartsWith("https:"))
                {
                    //要調(diào)用https的API接口，一定要加這句
                    ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
                }

                Encoding encoding = Encoding.UTF8;  //轉(zhuǎn)譯編碼
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);//創(chuàng)建
                request.Method = "POST";   //post請(qǐng)求的一些標(biāo)準(zhǔn)參數(shù)配置
                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
                request.ContentType = ContentType;

                //自定義頭部?jī)?nèi)容
                if (!string.IsNullOrEmpty(token))
                {
                    request.Headers.Add(HttpRequestHeader.Authorization, token);  //添加token
                }

                byte[] buffer = encoding.GetBytes(parms);  //譯編傳入的值格式化為可識(shí)別
                request.ContentLength = buffer.Length;  //post傳值參數(shù)標(biāo)配
                request.GetRequestStream().Write(buffer, 0, buffer.Length);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse(); //嘗試獲得要請(qǐng)求的URL的返回消息
                using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
                {
                    result = reader.ReadToEnd();
                }
            }
            catch (Exception ex)
            {
                result = "";
            }
            return result;
        }

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

namespace TranslateProject
{
    class Program
    {
        // 百度云中開(kāi)通對(duì)應(yīng)服務(wù)應(yīng)用的 API Key 建議開(kāi)通應(yīng)用的時(shí)候多選服務(wù)(百度云應(yīng)用的AK)
        private static String clientId = "qNldYXXtIr2pKBQsv242369Y";
        // 百度云中開(kāi)通對(duì)應(yīng)服務(wù)應(yīng)用的 Secret Key(百度云應(yīng)用的SK)
        private static String clientSecret = "L6gemOD3pM2PmafyQUBnXpCGEemk18mR";
        static void Main(string[] args)
        {
            try
            {
                #region 文本翻譯-通用版

                //獲取Token：詳細(xì)見(jiàn) https://ai.baidu.com/ai-doc/REFERENCE/Ck3dwjhhu
                string TokenJson = getAccessToken();
                if (!string.IsNullOrEmpty(TokenJson))
                {
                    AccessToken TokenEntity = JsonConvert.DeserializeObject<AccessToken>(TokenJson);
                    if (!string.IsNullOrEmpty(TokenEntity.error))
                    {
                        if (TokenEntity.error == "invalid_client" && TokenEntity.error_description == "unknown client id")
                            Console.WriteLine("API Key不正確");
                        else if (TokenEntity.error == "invalid_client" && TokenEntity.error_description == "Client authentication failed")
                            Console.WriteLine("Secret Key不正確");
                        else
                            Console.WriteLine("未知錯(cuò)誤：獲取Token失敗");
                        Console.ReadKey();
                        return;
                    }

                    string URL = "https://aip.baidubce.com/rpc/2.0/mt/texttrans/v1?access_token="+ TokenEntity.access_token;
                    string q = "文本翻譯是百度翻譯依托領(lǐng)先的自然語(yǔ)言處理技術(shù)推出的在線文本翻譯服務(wù)，可支持中、英、日、韓等200+語(yǔ)言互譯，100+語(yǔ)種自動(dòng)檢測(cè)。";
                    string parms = "{ \"q\":\"" + q + "\",\"from\":\"zh\",\"to\":\"en\"}"; //from：翻譯源語(yǔ)言     to：翻譯目標(biāo)語(yǔ)言     q：請(qǐng)求翻譯內(nèi)容

                    HttpTool httppost = new HttpTool();
                    var strJson = httppost.HttpPost(URL, parms, "", "application/json;charset=utf-8");
                    Console.WriteLine(strJson);
                    Console.ReadKey();
                }

                #endregion
            }
            catch (Exception ex)
            {
                Console.WriteLine("翻譯失?。? + ex.Message);
            }
        }

        //調(diào)用getAccessToken()獲取的 access_token建議根據(jù)expires_in 時(shí)間 設(shè)置緩存
        public static String getAccessToken()
        {
            try
            {
                String authHost = "https://aip.baidubce.com/oauth/2.0/token";
                HttpClient client = new HttpClient();
                List<KeyValuePair<String, String>> paraList = new List<KeyValuePair<string, string>>();
                paraList.Add(new KeyValuePair<string, string>("grant_type", "client_credentials"));
                paraList.Add(new KeyValuePair<string, string>("client_id", clientId));
                paraList.Add(new KeyValuePair<string, string>("client_secret", clientSecret));

                HttpResponseMessage response = client.PostAsync(authHost, new FormUrlEncodedContent(paraList)).Result;
                String result = response.Content.ReadAsStringAsync().Result;
                return result;
            }
            catch (Exception ex)
            {
                return "";
            }
            
        }
                
        public class AccessToken
        {
            public string refresh_token { get; set; }
            public int expires_in { get; set; }
            public string scope { get; set; }
            public string session_key { get; set; }
            public string access_token { get; set; }
            public string session_secret { get; set; }
            public string error { get; set; }
            public string error_description { get; set; }

        }
    }
}