可以在窗体载入事件中( private void XXX_Load(object sender, EventArgs e)),设置ComboBox的SelectedIndex属性为相关的索引值。
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; }