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//在datagridview的Editing事件里面写
private void dataGridView_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
ComboBox cb = e.Control as ComboBox;
if (cb != null)
{
cb.SelectedIndexChanged += new EventHandler(cb_SelectedIndexChanged);
}
}
void cb_SelectedIndexChanged(object sender, EventArgs e)
{
//这里执行你需要的,这就是下拉事件
}