TcpClient在C#中的SSL/TLS加密通信

在C#中，使用TcpClient进行SSL/TLS加密通信需要使用SslStream类

using System; using System.IO; using System.Net.Security; using System.Net.Sockets; using System.Security.Authentication; using System.Text;  namespace TcpClientSslDemo {     class Program     {         static void Main(string[] args)         {             // 服务器地址和端口             string serverAddress = "example.com";             int serverPort = 443;              // 创建TcpClient实例             using (TcpClient client = new TcpClient(serverAddress, serverPort))             {                 // 获取网络流                 NetworkStream networkStream = client.GetStream();                  // 创建SslStream实例                 using (SslStream sslStream = new SslStream(networkStream, false, ValidateServerCertificate))                 {                     // 开始SSL/TLS握手                     sslStream.AuthenticateAsClient(serverAddress, null, SslProtocols.Tls12, true);                      // 发送数据                     byte[] message = Encoding.UTF8.GetBytes("GET / HTTP/1.1\r\nHost: example.com\r\nConnection: close\r\n\r\n");                     sslStream.Write(message);                      // 接收数据                     byte[] buffer = new byte[2048];                     int bytesRead = sslStream.Read(buffer, 0, buffer.Length);                      // 处理接收到的数据                     string response = Encoding.UTF8.GetString(buffer, 0, bytesRead);                     Console.WriteLine(response);                 }             }         }          // 验证服务器证书的回调函数         public static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)         {             if (sslPolicyErrors == SslPolicyErrors.None)                 return true;              Console.WriteLine("Certificate error: {0}", sslPolicyErrors);             return false;         }     } } 

这个示例展示了如何使用TcpClient和SslStream类创建一个简单的客户端，连接到服务器并进行SSL/TLS加密通信。请注意，这个示例仅用于演示目的，实际应用中可能需要根据具体需求进行修改。