Zi 字媒體

C# 用HttpWebRequest和 WebClient 支援SSL、TLS 連線 範例 [CS_WebClient_TLS_Download] 資料來源:https://blog.darkthread.net/blog/webclient-and-tls12/ https://stackoverflow.com/a/39534068/288936 https://docs.microsoft.com/zh-tw/dotnet/api/system.net.servicepointmanager.expect100continue?view=netframework-4.7.2 http://libraclark.blogspot.com/2007/06/ssl.html https://docs.microsoft.com/en-us/dotnet/api/system.net.webclient.downloadfile?view=netframework-4.7.2 https://www.qiufengblog.com/articles/csharp-request-https.html GITHUB: https://github.com/jash-git/CS_WebClient_TLS_Download .net 4.6.1的版本 (VS2015) using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Net.Security; using System.Security.Cryptography.X509Certificates; using System.Text; using System.Threading.Tasks; //REF: https://blog.darkthread.net/blog/webclient-and-tls12/ namespace CS_WebClient_TLS_Download { class Program { static void pause() { Console.Write("Press any key to continue..."); Console.ReadKey(true); } public static bool ValidateServerCertificate(Object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; } static void Main(string[] args) { try { WebClient wc = new WebClient(); //REF: https://stackoverflow.com/a/39534068/288936 ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12; //REF: https://docs.microsoft.com/zh-tw/dotnet/api/system.net.servicepointmanager.expect100continue?view=netframework-4.7.2 //REF: https://www.cnblogs.com/dudu/p/the_remote_certificate_is_invalid_according_to_the_validation_procedure.html ServicePointManager.UseNagleAlgorithm = true; ServicePointManager.Expect100Continue = true; ServicePointManager.CheckCertificateRevocationList = false;//The remote certificate is invalid according to the validation procedure ServicePointManager.DefaultConnectionLimit = ServicePointManager.DefaultPersistentConnectionLimit; //REF: http://libraclark.blogspot.com/2007/06/ssl.html ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertificate); //REF: https://docs.microsoft.com/en-us/dotnet/api/system.net.webclient.downloadfile?view=netframework-4.7.2 wc.DownloadFile("https://www.moi.gov.tw/", "download00.html"); //REF: https://www.qiufengblog.com/articles/csharp-request-https.html HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.moi.gov.tw/"); HttpWebResponse response = null; try { response = request.GetResponse() as HttpWebResponse; using (Stream stream = response.GetResponseStream()) { using (StreamReader reader = new StreamReader(stream, Encoding.UTF8)) { string content = reader.ReadToEnd(); string file = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "download01.html"); File.WriteAllText(file, content, Encoding.UTF8); } } } catch (WebException ex) { response = (HttpWebResponse)ex.Response; Console.WriteLine("statuscode ={0}", response.StatusCode); } finally { if (response != null) { response.Close(); } } Console.WriteLine("download finish..."); } catch (Exception ex) { Console.WriteLine("ERROR=" + ex.ToString()); } pause(); } } }