c# - 如何为 ObexListener 对象设置超时？

Question

在执行以下行时，obexListener 对象出现问题:

ObexListenerContext context = obexListener.GetContext();

等待蓝牙传来的文件，程序收到文件后才响应。但是如果没有发送文件会发生什么？然后它会无限期地等待，我无法停止该程序。

如何实现等待时间，如果在那之后没有收到任何消息，那么操作将被取消？我留下代码:谢谢。

这是完整的代码:

private void codigo(object sender, BluetoothWin32AuthenticationEventArgs e)
        {
            if (!obexListener.Authenticate)
            {
                switch (MessageBox.Show("Desea vincular el dispositivo: " + e.Device.DeviceName.ToString(), "Atención", MessageBoxButtons.YesNo))
                //switch (MessageBox.Show("PIN CODE" + e.NumberOrPasskeyAsString, "EMPAREJAMINETO", MessageBoxButtons.YesNo))
                {
                    case DialogResult.Yes:
                        e.Confirm = true;
                        break;
                    case DialogResult.No:
                        e.Confirm = false;
                        break;
                }
            }
            else
            {
                switch (MessageBox.Show("Desea vincular el dispositivo: " + e.Device.DeviceName.ToString(), "Atención", MessageBoxButtons.YesNo))
                //switch (MessageBox.Show("PIN CODE" + e.NumberOrPasskeyAsString, "EMPAREJAMINETO", MessageBoxButtons.YesNo))
                {
                    case DialogResult.Yes:
                        e.Confirm = true;
                        MessageBox.Show("Bienvenido Nuevamente!");
                        break;
                    case DialogResult.No:
                        e.Confirm = false;
                        break;
                }
            }
        }

加载表单:

ObexListener obexListener = new ObexListener(ObexTransport.Bluetooth);
            BluetoothWin32Authentication bluetoothWin32 = new BluetoothWin32Authentication(codigo);
            Guid guid = new Guid(BluetoothService.SerialPort.ToString());
            obexListener.Start();

            if (obexListener.IsListening)
            {
                timer2.Start();
                ObexListenerContext context = obexListener.GetContext();
                context.Request.WriteFile(archivoBluetooth);
                obexListener.Close();
            }

Answer 1

这是 ObexListener 的两个扩展方法，它们将超时添加到 GetContext():

public static class ObexListenerExtensions
{
    public static ObexListenerContext GetContext(this ObexListener listener, int timeout)
    {
        var task = Task.Run(async () => await listener.GetContextAsync(timeout));
        return task.Result;
    }

    public static async Task<ObexListenerContext> GetContextAsync(this ObexListener obexListener, int timeout)
    {
        var task = Task.Run(() => obexListener.GetContext());

        if (await Task.WhenAny(task, Task.Delay(timeout)) == task)
        {
            return task.Result;
        }
        else
        {
            throw new TimeoutException();
        }
    }
}

尝试将它作为非嵌套类添加到您的代码中，然后替换:

ObexListenerContext context = obexListener.GetContext();

与:

ObexListenerContext context = obexListener.GetContext(1000);

这里的 timeput 以毫秒为单位。希望对您有所帮助。