单击按钮时如何使用私人区域中的数据

Question

我正在尝试从私有类中获取字节并在 btn.click 中使用它。我该怎么做？

这里是示例代码：

private void CameraConnnection_DataReceived(object sender, BReceivedData x)
        {
            byte[] data = e.ReceivedData;
        }

        private void BtnGetImage_Click(object sender, EventArgs e)
        {
            unsafe
            {
               byte a[]= e.ReceivedData;// This is not working how can I get received data from there.There is a event and it's triggering from there.
            }

Answer 1

由于EventArgs 类没有ReceivedData 字段或属性，下面的代码无法编译：

private void BtnGetImage_Click(object sender, EventArgs e)
{
  ...
  // Compile time error: ReceivedData doesn't exist
  byte a[] = e.ReceivedData;
  

您可以在DataReceived 事件上获取并保存 ReceivedData，但在Click 上使用它：

private byte[] receivedData = new byte[0];

private void CameraConnnection_DataReceived(object sender, BReceivedData x)
{
    // ?? new byte[0] - to be on the safe side and never have null
    receivedData = e.ReceivedData ?? new byte[0];
}

private void BtnGetImage_Click(object sender, EventArgs e) {
  byte[] a = receivedData;

  ...
}