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c#串口程序调试时显示输入字符串格式不正确

程序如下 private void button1_Click(object sender, EventArgs e) { sp.PortName = comboBox1.SelectedItem.ToString(); sp.BaudRate = int.Parse(comboBox2.SelectedItem.ToString()); try { sp.Open(); readsp = new Thread(new ThreadStart(readdate)); readsp.Start(); } catch { MessageBox.Show("打开串口失败!"); } } 调试时sp.BaudRate = int.Parse(comboBox2.SelectedItem.ToString());这行显示输入字符串格式不正确,求指教
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