C#的treeview节点选择

Question

private void SearchTreeView_Load(object sender, EventArgs e)
        {
            // 记录按钮的位置
            m_ptRptLocation = new Point(btnSearchByTime.Left, btnSearchByTime.Bottom + 3);
            m_Loaction[0] = btnSearchByTime.Location;
            m_Loaction[1] = btnSearchByDoor.Location;
            m_Loaction[2] = btnSearchByUser.Location;
            m_Loaction[3] = btnComSearch.Location;
            m_Loaction[4] = btnShowAll.Location;
            m_Loaction[5] = btnToExcel.Location;
            m_Loaction[6] = btnSearch.Location;
            btnSearch.Visible = false;
            m_btnArray[0] = btnSearchByTime;
            m_btnArray[1] = btnSearchByDoor;
            m_btnArray[2] = btnSearchByUser;
            m_btnArray[3] = btnComSearch;
            m_btnArray[4] = btnShowAll;
            m_btnArray[5] = btnToExcel;
            m_btnArray[6] = btnSearch;
            m_btnArray[6].Location = m_Loaction[0];            treeSearch.HideSelection = true;
            treeSearch.SelectedNode = treeSearch.Nodes[0];            // 初始化4个报表的位置和大小
            rptOpenDoorRecord.Location = m_ptRptLocation;
            rptFiRecord.Location = m_ptRptLocation;
            rptUserList.Location = m_ptRptLocation;
            rptOperateLog.Location = m_ptRptLocation;
            rptOpenDoorRecord.Size = m_sizeRpt;
            rptFiRecord.Size = m_sizeRpt;
            rptUserList.Size = m_sizeRpt;
            rptOperateLog.Size = m_sizeRpt;
        }
private void treeSearch_AfterSelect(object sender, TreeViewEventArgs e)
        {
            int nSel = e.Node.Index;
            RefreshInterFace(nSel);
        }
 private void RefreshInterFace(int nSel)
        {
            if (m_nShowType == nSel)
            {
                return;
            }
}
 public void btnSearchClick()
        {
            SearchTreeView treeView = new SearchTreeView();
            if (treeSearch.SelectedNode = )
       这个if中该填什么条件才能表示是我选择的对象呢            {
                UserSearch usersearch = new UserSearch();
                if (usersearch.ShowDialog() == DialogResult.OK)
                {
                    LoadUser(UserSearch.m_strSql);
                }
            }
            else if(== "操作记录查询")
            {
                LogSearch logsearch = new LogSearch();
                if (logsearch.ShowDialog() == DialogResult.OK)
                {
                    LoadOperateLogReport(LogSearch.m_strSql);
                }
            }
        }

Answer 1

不太明白楼主的意思，不知道写的对不对：if (treeSearch.SelectedNode!=null)

Answer 2

   //删除
    protected void ButtonDel_Click(object sender, EventArgs e)
    {
        if (TreeView_App.SelectedNode != null)
        {
             string aa = TreeView_App.SelectedNode.Value;
         }
    }