可以在窗體載入事件中( private void XXX_Load(object sender, EventArgs e)),設置ComboBox的SelectedIndex屬性爲相關的索引值。
如:
private void XXX_Load(object sender, EventArgs e)
{
this.cmb_ComPorts.SelectedIndex = 0;
this.cmb_BaudRate.SelectedIndex = 6;
this.cmb_DataBits.SelectedIndex = 0;
this.cmb_StopBits.SelectedIndex = 0;
this.cmb_Parity.SelectedIndex = 0;
}