C＃WPF在套接字發送和接收數據時顯示加載屏幕C＃

Question

我正在構建一個WPF應用程序，該應用程序使用套接字在服務器之間來回傳輸數據。 問題：在從服務器發送和接收數據時，屏幕被凍結，我想添加一個簡單的加載動畫，以便最終用戶將知道它當前正在加載，但是我不知道如何

我的C＃套接字代碼：

public static string SendRecOne(string dataToSvr)
    {
        TcpClient client = new TcpClient(SERVER_NAME, PORT);
        #region SendRequest
        int ByteCount = Encoding.ASCII.GetByteCount(dataToSvr); //How much bytes?
        byte[] ByteBuffer = new byte[1024]; //initialize byte array
        ByteBuffer = Encoding.ASCII.GetBytes(dataToSvr);
        NetworkStream stream = client.GetStream();
        stream.Write(ByteBuffer, 0, ByteBuffer.Length);
        #endregion
        #region Receive Response
        //byte[] responseData = new byte[client.ReceiveBufferSize];
        //int bytesRead = stream.Read(responseData, 0, client.ReceiveBufferSize);
        int i;
        string ToReturn = null;
        ByteBuffer = new byte[ByteBuffer.Length];
        MemoryStream ms = new MemoryStream();
        while (true)
        {
            if (stream.DataAvailable)
            {
                while ((i = stream.Read(ByteBuffer, 0, ByteBuffer.Length)) != 0)
                {
                    ms.Write(ByteBuffer, 0, ByteBuffer.Length);
                    if (stream.DataAvailable)
                        continue;
                    else
                        break;
                }
                ToReturn = Encoding.ASCII.GetString(ms.ToArray());
                return ToReturn;
            }
        }
        #endregion

並在窗口中按下名為“ login.xaml”的按鈕后調用它，並在檢查數據正常后關閉當前窗口並初始化dashboard.xaml。 與服務器通信時，我只需要添加動畫即可。

謝謝！

Answer 1

在后台線程上調用您的SendRecOne方法，或者通過使用* Async重載使其異步：

public static async Task<string> SendRecOne(string dataToSvr)
{
    progressBar.Visibility = Visibility.Visible;
    string ToReturn = null;
    using (TcpClient client = new TcpClient(SERVER_NAME, PORT))
    {
        int ByteCount = Encoding.ASCII.GetByteCount(dataToSvr); //How much bytes?
        byte[] ByteBuffer = new byte[1024]; //initialize byte array
        ByteBuffer = Encoding.ASCII.GetBytes(dataToSvr);
        NetworkStream stream = client.GetStream();
        await stream.WriteAsync(ByteBuffer, 0, ByteBuffer.Length);

        //byte[] responseData = new byte[client.ReceiveBufferSize];
        //int bytesRead = await stream.ReadAsync(responseData, 0, client.ReceiveBufferSize);
        int i;
        ByteBuffer = new byte[ByteBuffer.Length];
        MemoryStream ms = new MemoryStream();
        if (stream.DataAvailable)
        {
            while ((i = await stream.ReadAsync(ByteBuffer, 0, ByteBuffer.Length)) != 0)
            {
                await ms.WriteAsync(ByteBuffer, 0, ByteBuffer.Length);
                if (!stream.DataAvailable)
                    break;
            }
            ToReturn = Encoding.ASCII.GetString(ms.ToArray());
        }
        progressBar.Visibility = Visibility.Collapsed;
    }
    return ToReturn;
}

XAML：

<ProgressBar x:Name="progressBar" IsIndeterminate="True" />

UI線程無法同時處理消息和執行代碼。