刚刚学习C#，使用串口控件设备接收数据时，发现长帧报文会分多行读取，该怎么处理？代码如下，求具体指导

else if (serialPort1.IsOpen)
{
int n2 = 0;
try
{
receive:

Byte[] receivedData = new Byte[serialPort1.BytesToRead]; //创建接收字节数组
string dt2 = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss.fff");
serialPort1.Read(receivedData, 0, receivedData.Length); //读取数据
serialPort1.DiscardInBuffer(); //清空SerialPort控件的Buffer
string strRcv = "";
for (int i = 0; i < receivedData.Length; i++) //窗体显示
{
strRcv += receivedData[i].ToString("X2") + " "; //16进制显示
}
n2 += receivedData.Length;
received_count += n2; //累计接收字节数
if (strRcv.Trim() != "")
{
listBox1.Items.Add(dt2 + " <<== RX: " + strRcv + "\n\t");
}
label10.Text = "Recive: " + received_count.ToString();

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