这是我的最终解决方案。它可以处理大量数据。我
Timer用来确保用户要查找当前值。看起来很复杂，但事实并非如此。感谢 Max Lambertini
的想法。
private bool _canUpdate = true; private bool _needUpdate = false; //If text has been changed then start timer //If the user doesn't change text while the timer runs then start search private void combobox1_TextChanged(object sender, EventArgs e) { if (_needUpdate) { if (_canUpdate) { _canUpdate = false; UpdateData(); } else { RestartTimer(); } } } private void UpdateData() { if (combobox1.Text.Length > 1) { List<string> searchData = Search.GetData(combobox1.Text); HandleTextChanged(searchData); } } //If an item was selected don't start new search private void combobox1_SelectedIndexChanged(object sender, EventArgs e) { _needUpdate = false; } //Update data only when the user (not program) change something private void combobox1_TextUpdate(object sender, EventArgs e) { _needUpdate = true; } //While timer is running don't start search //timer1.Interval = 1500; private void RestartTimer() { timer1.Stop(); _canUpdate = false; timer1.Start(); } //Update data when timer stops private void timer1_Tick(object sender, EventArgs e) { _canUpdate = true; timer1.Stop(); UpdateData(); } //Update combobox with new data private void HandleTextChanged(List<string> dataSource) { var text = combobox1.Text; if (dataSource.Count() > 0) { combobox1.DataSource = dataSource; var sText = combobox1.Items[0].ToString(); combobox1.SelectionStart = text.Length; combobox1.SelectionLength = sText.Length - text.Length; combobox1.DroppedDown = true; return; } else { combobox1.DroppedDown = false; combobox1.SelectionStart = text.Length; } }这个解决方案不是很酷。因此，如果有人有其他解决方案，请与我分享。
