C# 获取社会统一信用代码

时间不多，废话少说：

网络请求代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.DirectoryServices.Protocols;
using System.ServiceModel.Security;
using System.Net;
using System.IO;
using System.IO.Compression;
using System.Text.RegularExpressions;
using System.Threading;

namespace Meeting.Common
{
    /// <summary>
    /// 有关HTTP请求的辅助类
    /// </summary>
    public class HttpWebResponseUtility
    {

        public static string GetUrl(string url)
        {

            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                System.Console.WriteLine("https connections.....");
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                // 这里设置了协议类型。
                //ServicePointManager.SecurityProtocol =SecurityProtocolType.Tls12;// (SecurityProtocolType)3072;// SecurityProtocolType.Tls1.2;
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; //(SecurityProtocolType)768 | (SecurityProtocolType)3072

                ServicePointManager.CheckCertificateRevocationList = true;
                ServicePointManager.DefaultConnectionLimit = ;
                ServicePointManager.Expect100Continue = false;
            }
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            //增加下面两个属性即可
            request.KeepAlive = false;
            request.ProtocolVersion = HttpVersion.Version10;

            request.Method = "GET";    //使用get方式发送数据
            request.ContentType = "application/x-www-form-urlencoded";
            request.Referer = "";
            request.AllowAutoRedirect = true;
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
            request.Accept = "*/*";

            //获取网页响应结果
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
           // Thread.Sleep(2000);
            Stream stream = response.GetResponseStream();
            //client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            string result = string.Empty;
            using (StreamReader sr = new StreamReader(stream))
            {
                result = sr.ReadToEnd();
            }

            if (request != null)
            {
                request.Abort();
            }

            if (response != null)
            {
                response.Close();
            }

            return result;
        }
        private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        /// <summary>
        /// 创建GET方式的HTTP请求
        /// </summary>
        /// <param name="url">请求的URL</param>
        /// <param name="timeout">请求的超时时间</param>
        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>
        /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>
        /// <returns></returns>
        public static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent, CookieCollection cookies)
        {
            if (string.IsNullOrEmpty(url))
            {
                throw new ArgumentNullException("url");
            }
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "GET";
            request.UserAgent = DefaultUserAgent;
            if (!string.IsNullOrEmpty(userAgent))
            {
                request.UserAgent = userAgent;
            }
            if (timeout.HasValue)
            {
                request.Timeout = timeout.Value;
            }
            if (cookies != null)
            {
                request.CookieContainer = new CookieContainer();
                request.CookieContainer.Add(cookies);
            }
            return request.GetResponse() as HttpWebResponse;
        }
        /// <summary>
        /// 创建POST方式的HTTP请求
        /// </summary>
        /// <param name="url">请求的URL</param>
        /// <param name="parameters">随同请求POST的参数名称及参数值字典</param>
        /// <param name="timeout">请求的超时时间</param>
        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>
        /// <param name="requestEncoding">发送HTTP请求时所用的编码</param>
        /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>
        /// <returns></returns>
        public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies)
        {
            if (string.IsNullOrEmpty(url))
            {
                throw new ArgumentNullException("url");
            }
            if (requestEncoding == null)
            {
                throw new ArgumentNullException("requestEncoding");
            }
            HttpWebRequest request = null;
            //如果是发送HTTPS请求
            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                request = WebRequest.Create(url) as HttpWebRequest;
                request.ProtocolVersion = HttpVersion.Version10;
            }
            else
            {
                request = WebRequest.Create(url) as HttpWebRequest;
            }
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";

            if (!string.IsNullOrEmpty(userAgent))
            {
                request.UserAgent = userAgent;
            }
            else
            {
                request.UserAgent = DefaultUserAgent;
            }

            if (timeout.HasValue)
            {
                request.Timeout = timeout.Value;
            }
            if (cookies != null)
            {
                request.CookieContainer = new CookieContainer();
                request.CookieContainer.Add(cookies);
            }
            //如果需要POST数据
            if (!(parameters == null || parameters.Count == ))
            {
                StringBuilder buffer = new StringBuilder();
                int i = ;
                foreach (string key in parameters.Keys)
                {
                    if (i > )
                    {
                        buffer.AppendFormat("&{0}={1}", key, parameters[key]);
                    }
                    else
                    {
                        buffer.AppendFormat("{0}={1}", key, parameters[key]);
                    }
                    i++;
                }
                byte[] data = requestEncoding.GetBytes(buffer.ToString());
                using (Stream stream = request.GetRequestStream())
                {
                    stream.Write(data, , data.Length);
                }
            }
            return request.GetResponse() as HttpWebResponse;
        }

        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true; //总是接受
        }
    }
}

执行代码如下：

        public static void GetLinceNo()
        {
            using (TPMSEntities context = new TPMSEntities())
            {
                List<dc_cb_SupplierLinceNo> lst = new List<dc_cb_SupplierLinceNo>();
                var data = context.dc_p_Provider_temp2019.ToList();
                foreach(var item in data)
                {
                    if (!string.IsNullOrEmpty(item.LicenceNo))
                    {
                        continue;
                    }
                    string uri = string.Format("https://www.creditchina.gov.cn/api/public_search/getCreditCodeFacade?keyword={0}&_={1}", item.SupplierName, GetTimestamp(DateTime.Now));

                    var json = HttpWebResponseUtility.GetUrl(uri);
                    if (!string.IsNullOrEmpty(json))
                    {
                        try
                        {
                            var jsonResult = JsonConvert.DeserializeObject<res>(json);

                            if (jsonResult != null && jsonResult.result != null && jsonResult.result.results != null)
                            {
                                var model = jsonResult.result.results.Where(A => A.entName == item.SupplierName).FirstOrDefault();
                                if (model == null)
                                {
                                    continue;
                                }
                                string credCode = model.credCode;
                                dc_cb_SupplierLinceNo d = new dc_cb_SupplierLinceNo();
                                d.SupplierName = item.SupplierName;
                                d.LinceNo = credCode;
                                context.dc_cb_SupplierLinceNo.Add(d);
                                context.SaveChanges();
                            }
                            else
                            {
                                continue;
                            }
                        }
                        catch(Exception ex)
                        {
                            continue;
                        }
                    }
                    else
                    {
                        continue;
                    }

                }
                //using (var Transaction = context.Database.BeginTransaction())
                //{
                //    try
                //    {

                //        Transaction.Commit();
                //    }
                //    catch (Exception ex)
                //    {
                //        Transaction.Rollback();
                //    }
                //}
            }
        }

        public static string GetTimestamp(DateTime d)
        {
            TimeSpan ts = d - new DateTime(, , );
            return ts.TotalMilliseconds.ToString();
        }
        #endregion 

        public class res
        {
            public resultCls result { get; set; }
            public int totalPageCount { get; set; }
        }

        public class resultCls
        {
            public string start { get; set; }
            public string pageSize { get; set; }
            public string totalCount { get; set; }
            public List<resultsCls> results { get; set; }
            public string exportButtonValid { get; set; }
            public string currentPageNo { get; set; }
            public string page { get; set; }
            public string totalPageCount { get; set; }

        }

        public class resultsCls
        {
            public string id { get; set; }
            public string entName { get; set; }
            public string credCode { get; set; }
            public string regCode { get; set; }
            public string orgCode { get; set; }
            public string taxCode { get; set; }

            public string status { get; set; }
            public string modifyDate { get; set; }
            public string md5 { get; set; }
            public string rank { get; set; }
            public string solrStatus { get; set; }
            public string validTime { get; set; }
        }

虽说免费，但是这个方法服务端会限制请求的次数！

@陈卧龙的博客