C#调用百度AI机器翻译API实现多语言互译

/// <summary>
        /// post请求方式
        /// </summary>
        /// <param name="url">请求路径</param>
        /// <param name="parms">传入的值，格式为：{city:"上海"，city2:"重庆"}</param>
        /// <param name="token"></param>
        /// <param name="ContentType">内容类型，默认application/json</param>
        /// <returns>返回响应结果字符串</returns>
        public string HttpPost(string url, string parms, string token,string ContentType= "application/json")
        {
            string result = string.Empty;
            try
            {
                // 强制使用TLS 1.2 (3072对应TLS 1.2枚举值)
                if (url.StartsWith("https:"))
                {
                    ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
                }

                Encoding encoding = Encoding.UTF8;  //转译编码
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);//创建请求对象
                request.Method = "POST";   //post请求的一些标准参数配置
                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
                request.ContentType = ContentType;

                //自定义头部内容
                if (!string.IsNullOrEmpty(token))
                {
                    request.Headers.Add(HttpRequestHeader.Authorization, token);  //添加token
                }

                byte[] buffer = encoding.GetBytes(parms);  //将参数字符串转换为字节数组
                request.ContentLength = buffer.Length;  //post传值参数标配
                request.GetRequestStream().Write(buffer, 0, buffer.Length);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse(); //尝试获得要请求的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
    {
        // 百度云中开通对应服务应用的 API Key 建议开通应用的时候多选服务(百度云应用的AK)
        private static String clientId = "YOUR_CLIENT_ID"; 
        // 百度云中开通对应服务应用的 Secret Key(百度云应用的SK)
        private static String clientSecret = "YOUR_CLIENT_SECRET";

        static void Main(string[] args)
        {
            try
            {
                #region 文本翻译-通用版

                //1. 获取Token
                string TokenJson = getAccessToken();
                if (!string.IsNullOrEmpty(TokenJson))
                {
                    AccessToken TokenEntity = JsonConvert.DeserializeObject<AccessToken>(TokenJson);
                    
                    // 检查Token是否获取成功
                    if (!string.IsNullOrEmpty(TokenEntity.error))
                    {
                        if (TokenEntity.error == "invalid_client" && TokenEntity.error_description == "unknown client id")
                            Console.WriteLine("API Key不正确");
                        else if (TokenEntity.error == "invalid_client" && TokenEntity.error_description == "Client authentication failed")
                            Console.WriteLine("Secret Key不正确");
                        else
                            Console.WriteLine("未知错误：获取Token失败");
                        Console.ReadKey();
                        return;
                    }

                    //2. 构造翻译请求URL及参数
                    // 文档地址：https://cloud.baidu.com/doc/MT/s/4kqryjku9
                    string URL = "https://aip.baidubce.com/rpc/2.0/mt/texttrans/v1?access_token="+ TokenEntity.access_token;
                    
                    string q = "文本翻译是百度翻译依托领先的自然语言处理技术推出的在线文本翻译服务，可支持中、英、日、韩等200+语言互译，100+语种自动检测。";
                    // from: 源语言 zh(chinese), to: 目标语言 en(english)
                    string parms = "{ \"q\":\"" + q + "\",\"from\":\"zh\",\"to\":\"en\"}";

                    //3. 发送HTTP Post请求
                    HttpTool httppost = new HttpTool();
                    var strJson = httppost.HttpPost(URL, parms, "", "application/json;charset=utf-8");
                    
                    Console.WriteLine(strJson);
                }

                #endregion
            }
            catch (Exception ex)
            {
                Console.WriteLine("翻译失败：" + ex.Message);
            }
        }

        //调用getAccessToken()获取的 access_token建议根据expires_in 时间 设置缓存
        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; }

        }
    }
}