过滤级联CheckedListBox并保留项的检查状态

private void FilterCheckedListBox(string filterText)
{
    for (int i = 0; i < checkedListBox1.Items.Count; i++)
    {
        string itemText = checkedListBox1.Items[i].ToString();
        bool isMatch = itemText.Contains(filterText);

        if (isMatch)
        {
            // 保留已选中的项的检查状态
            checkedListBox1.SetItemChecked(i, checkedListBox1.GetItemChecked(i));
        }
        else
        {
            // 取消不满足条件的项的选中状态
            checkedListBox1.SetItemChecked(i, false);
        }
    }
}