控件篇：CheckedListBox的全选与反选

  private void cbXmlAll_CheckedChanged(object sender, EventArgs e)
        {
            for (int i = 0; i < cblXmlList.Items.Count; i++)
            {
                cblXmlList.SetItemChecked(i, cbXmlAll.Checked);
            }
        }

        private void cbXmlR_CheckedChanged(object sender, EventArgs e)
        {
            for (int i = 0; i < cblXmlList.Items.Count; i++)
            {
                cblXmlList.SetItemChecked(i, !cblXmlList.GetItemChecked(i));
            }
        }

cbXmlAll是checkbox，全选。cbXmlR是checkbox，反选。