AvaloniaTCP-v1.0.0：學習使用Avalonia/C#進行TCP通訊的一個簡單Demo

mingupupup發表於2024-10-14
TCPC#

TCP通訊簡介

TCP（傳輸控制協議，Transmission Control Protocol）是一種面向連線的、可靠的、基於位元組流的傳輸層通訊協議。它確保資料包按順序傳輸，並在必要時進行重傳，以保證資料的完整性和準確性。TCP透過三次握手建立連線，透過四次揮手釋放連線，確保通訊雙方在傳輸資料前已準備好，並在傳輸結束後正確關閉連線。TCP廣泛應用於需要高可靠性的網路應用，如網頁瀏覽、檔案傳輸和電子郵件等。

Demo效果

啟動兩個應用，一個當服務端，一個當客戶端。

開啟服務端：

image-20241014112528767

開啟客戶端：

image-20241014112558142

客戶端向服務端傳送訊息：

image-20241014112646168

服務端向客戶端傳送訊息：

image-20241014112730780

Demo程式碼

啟動服務端：

[RelayCommand]
private async Task StartServer()
{
    System.Net.IPAddress Ip = System.Net.IPAddress.Parse(IpAddress);
    _tcpServer = new TcpListener(Ip, Port);
    _tcpServer.Start();
    Message += "Server started. Waiting for a connection...\r\n";

    // 接受客戶端連線
    _tcpServer_Client = await _tcpServer.AcceptTcpClientAsync();
    Message += "客戶端已連線\r\n";

    // Handle client communication
    _ = HandleClientAsync(_tcpServer_Client);
}

private async Task HandleClientAsync(TcpClient client)
{
    var stream = client.GetStream();
    var buffer = new byte[1024];
    int bytesRead;

    while ((bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length)) != 0)
    {
        var message = Encoding.UTF8.GetString(buffer, 0, bytesRead);
        Message+=$"Received from client: {message}\r\n";

        // Echo the message back to the client
        //var response = Encoding.UTF8.GetBytes($"Echo: {message}");
        //await stream.WriteAsync(response, 0, response.Length);
    }

    Message += "Client disconnected...\r\n";
    stream.Close();
}

啟動客戶端：

 [RelayCommand]
 private async Task StartClient()
 {
     System.Net.IPAddress Ip = System.Net.IPAddress.Parse(IpAddress);
     _tcpClient = new TcpClient();
     await _tcpClient.ConnectAsync(Ip, Port);
     Message += "Connected to server...\r\n";
     
     _ = HandleServerCommunicationAsync(_tcpClient);
 }

private async Task HandleServerCommunicationAsync(TcpClient client)
{
    var stream = client.GetStream();
    var buffer = new byte[1024];
    int bytesRead;

    while ((bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length)) != 0)
    {
        var message = Encoding.UTF8.GetString(buffer, 0, bytesRead);
        Message += $"Received from server: {message}\r\n";
       
    }

    Message += "Disconnected from server...\r\n";
    stream.Close();
}

向服務端發訊息：

 [RelayCommand]
 private async Task SendMessageToServer()
 {
     if (_tcpClient == null || !_tcpClient.Connected)
     {
         Message += "Not connected to server.\r\n";
         return;
     }

     var stream = _tcpClient.GetStream();
     var data = Encoding.UTF8.GetBytes(Text);
     await stream.WriteAsync(data, 0, data.Length);
     Message += $"Sent: {Text}\r\n";
 }

向客戶端發訊息：

[RelayCommand]
private async Task SendMessageToClient()
{
    if (_tcpServer_Client == null || !_tcpServer_Client.Connected)
    {
        Message += "Not connected to client.\r\n";
        return;
    }

    var stream = _tcpServer_Client.GetStream();
    var data = Encoding.UTF8.GetBytes(Text);
    await stream.WriteAsync(data, 0, data.Length);
    Message += $"Sent: {Text}\r\n";
}

全部程式碼已上傳至https://github.com/Ming-jiayou/AvaloniaTCP。

希望透過我的點滴分享，能夠讓對Avalonia感興趣的朋友，更快入門。

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