public Form1()
{
	InitializeComponent();
 
	serialPort1.DataReceived += new SerialDataReceivedEventHandler(SerialReceiveCallback);
	serialPort1.Encoding = Encoding.UTF8;
	System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
}
 
public void SerialReceiveCallback(object sender, SerialDataReceivedEventArgs e)
{
	try
	{
		if (serialPort1.BytesToRead == 0)
			return;
 
		//接收字節(jié)序列直接處理
		byte[] bytes = new byte[serialPort1.BytesToRead];
		serialPort1.Read(bytes, 0, bytes.Length);
 
		//或者再轉成字符串進行打印\處理
		string receive_data = System.Text.Encoding.Default.GetString(bytes);
		textBox1.AppendText(receive_data + "\r\n");
	}
	catch
	{
		MessageBox.Show("數(shù)據(jù)接收出現(xiàn)異常");
	}
}

using System.IO.Ports;
using System.Management;

private void button3_Click(object sender, EventArgs e)//打開串口按鈕
{
	try 
	{
		if (button3.Text == "打開串口")
		{
			button3.Text = "關閉串口";
			serialPort1.Close();
			string[] sArray = comboBox1.Text.Split(new string[] { " " }, 2, StringSplitOptions.RemoveEmptyEntries);
			serialPort1.PortName = sArray[0];
			serialPort1.BaudRate = 115200;
			serialPort1.Parity = Parity.None;
			serialPort1.StopBits = StopBits.One;
			serialPort1.DataBits = 8;
			serialPort1.Open();
			textBox1.AppendText("打開串口成功\r\n");
		}
		else
		{
			button3.Text = "打開串口";
			textBox1.AppendText("串口已關閉\r\n");
			if (serialPort1.IsOpen == false)
				return;
			else
				serialPort1.Close();
		}
	}
	catch {
		button3.Text = "打開串口";
		MessageBox.Show("打開串口失敗");
	}
}
 
private void button2_Click(object sender, EventArgs e)//發(fā)送數(shù)據(jù)
{
	if (textBox2.Text.Length == 0)
	{
		MessageBox.Show("請在文本框中輸入數(shù)據(jù)");
	}
	else
	{
		serialPort1.Write(textBox2.Text);
	}
}
 
private void button4_Click(object sender, EventArgs e)//清空接收區(qū)按鈕
{
	textBox1.Clear();
}
 
private void button5_Click(object sender, EventArgs e)//清空發(fā)送區(qū)按鈕
{
	textBox2.Clear();
}

private void listBox1_MouseDoubleClick(object sender, MouseEventArgs e) //選擇鼠標雙擊事件
{
	OpenFileDialog dialog = new OpenFileDialog();
	dialog.Multiselect = false;
	dialog.Title = "請選擇升級文件";
	dialog.Filter = "hex格式（*.hex）|*.hex";
 
	if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
	{
		string strPath = dialog.FileName;
		listBox1.Items.Clear();
		listBox1.Items.Add(strPath);
	}
}
 
private void listBox1_DragDrop(object sender, DragEventArgs e)//選擇文件拖入完成事件
{
    string strPath = ((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString();
 
	if (strPath.Contains(".hex"))
	{
		listBox1.Items.Clear();
		listBox1.Items.Add(strPath);
	}
	else
	{
		MessageBox.Show("文件格式錯誤");
	}
}
 
private void listBox1_DragEnter(object sender, DragEventArgs e)//選擇文件拖入事件
{
	if (e.Data.GetDataPresent(DataFormats.FileDrop))
	{
		e.Effect = DragDropEffects.All;
	}
	else
	{
		e.Effect = DragDropEffects.None;
	}
}