C# Socket 開發快速入門（二）：Socket 類別客戶端完整範例

Client 端 Socket 完整範例

static void Main() {
    int port = 2000; string host = "127.0.0.1";
    IPEndPoint ipe = new IPEndPoint(IPAddress.Parse(host), port);
    Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    Console.WriteLine("Connecting...");
    c.Connect(ipe); // 連線至伺服器

    string msg = "hello! This is a socket test";
    byte[] data = Encoding.ASCII.GetBytes(msg);
    c.Send(data); // 發送

    byte[] buffer = new byte[1024];
    int len = c.Receive(buffer); // 接收回應
    string reply = Encoding.ASCII.GetString(buffer, 0, len);
    Console.WriteLine("Client Get Message: " + reply);
    c.Close();
}

關鍵步驟解析

1. IPEndPoint：IP + Port 端點封裝
2. Socket 建構：InterNetwork(IPv4)、Stream(串流)、Tcp
3. Connect：主動發起三向交握
4. Send/Receive：同步阻塞收發，需自行處理封包邊界（本例簡化假設單次收發完整）
5. 例外處理：ArgumentNullException、SocketException

下一篇將實作伺服器端對應程式碼。