关于树形控件

最近一段时间一直在围绕树形控件在做东西
在最开始的一段时间里由于开始所用的数据类型是用数据组实现的
造成在后期的树形控件的节点的添加困难
最终还是取消了用数组来实现，而用了DataSet
主要相关代码：

private void treeView1_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
        {
            try
            {
                //节点为根节点
                if(this.treeView1.SelectedNode.Parent ==null)
                {
                    flagIOServer =true;
                    this.tabControl1.SelectedIndex =0;
                    this.menuItem_AddIOServer.Enabled=true;
                    this.menuItem_AddSubSystem.Enabled=false;
                    this.menuItem_AddSystem.Enabled=false;
                    this.menuItem_AddTag.Enabled=false;
                    this.menuItem_DeleteSubSystem.Enabled=false;
                    this.menuItem_DeleteSystem.Enabled=false;
                    this.menuItem_UpdateTag.Enabled=false;
                    ds.Tables.Clear();
                    comm.CommandText ="select TagID 列表ID ,AutoSubSysID 子系统ID,TagCode 节点编码,TagName 节点名称,TagType 节点类型,TagValueType 数据类型,TagMaxValue 最大值,TagMinValue 最小值,TagAlartMax 报警最大值 ,TagAlartMin 报警最小值,TagSaveInterval 存储时间间隔,TagSaveIgBand 存储变化盲区,CreateTime 创建时间,TimeStampMode 时戳确定方式,TagAlartPos 报警点,TagAlartPosDes 报警点描述,Description 描述 from TagInfo";
                    da = new OracleDataAdapter(comm.CommandText,conn);
                    if(conn.State.ToString()=="Open")
                    {
                        da.Fill(ds,"TagInfo");
                        conn.Close();
                        takeHideValue("TagInfo");
                        this.dataGrid1.DataSource =ds.Tables["TagInfo"];
                    }
                    else
                    {
                        conn.Open();
                        da.Fill(ds,"TagInfo");
                        conn.Close();
                        takeHideValue("TagInfo");
                        this.dataGrid1.DataSource=ds.Tables["TagInfo"];
                    }
                }
                    //节点为IOServer节点
                else if(this.treeView1.SelectedNode.Parent.Parent ==null)
                {
                    flagSystem =true;
                    flagIOServer =false;
                    selectNode =this.treeView1.SelectedNode;
                    this.tabControl1.SelectedIndex =2;
                    this.menuItem_AddIOServer.Enabled=true;
                    this.menuItem_AddSubSystem.Enabled=false;
                    this.menuItem_AddSystem.Enabled=true;
                    this.menuItem_AddTag.Enabled=false;
                    this.menuItem_DeleteSubSystem.Enabled=false;
                    this.menuItem_DeleteSystem.Enabled=false;
                    this.menuItem_UpdateTag.Enabled=false;
                    string ID =this.treeView1.SelectedNode.Text.ToString().Trim().Substring(0,10);
                    comm.CommandText="select * from IOServerInfo where IOServerID =";
                    comm.CommandText+="'"+ID+"'";
                    da = new OracleDataAdapter(comm.CommandText,conn);
                    if(conn.State.ToString()=="Open")
                    {
                        da.Fill(ds,"tab_IO");
                        conn.Close();
                    }
                    else
                    {
                        conn.Open();
                        da.Fill(ds,"tab_IO");
                        conn.Close();
                    }
                    foreach(DataRow RowIO in ds.Tables["tab_IO"].Rows)
                    {
                        this.txt_IOServerCode.Text =RowIO[1].ToString().Trim();
                        this.txt_IOServerName.Text=RowIO[2].ToString().Trim();
                        this.rtxt_IOServer.Text=RowIO[4].ToString().Trim();
                    }
                    ds.Tables.Clear();
                    comm.CommandText="select TagID 列表ID ,TagInfo.AutoSubSysID 子系统ID,TagCode 节点编码,TagName 节点名称,TagType 节点类型,TagValueType 数据类型 ,TagMaxValue 最大值,TagMinValue 最小值,TagAlartMax 报警最大值 ,TagAlartMin 报警最小值,TagSaveInterval 存储时间间隔,TagSaveIgBand 存储变化盲区,TagInfo.CreateTime 创建时间,TagInfo.TimeStampMode 时戳确定方式,TagAlartPos 报警点,TagAlartPosDes 报警点描述,TagInfo.Description 描述 from TagInfo where AutoSubSysID in (select AutoSubSysID from ";
                    comm.CommandText+="AutoSubSystemInfo where AutoSysID in (select AutoSysID from AutoSystemInfo where IOServerID";
                    comm.CommandText+=" in(select IOServerID from IOServerInfo where IOServerID =";
                    comm.CommandText+="'"+ID+"'";
                    comm.CommandText+=")))";
                    da = new OracleDataAdapter(comm.CommandText,conn);
                    if(conn.State.ToString()=="Open")
                    {
                        da.Fill(ds,"Tag_IOServer");
                        conn.Close();
                    }
                    else
                    {
                        conn.Open();
                        da.Fill(ds,"Tag_IOServer");
                        conn.Close();
                    }
                    takeHideValue("Tag_IOServer");
                    this.dataGrid1.DataSource=ds.Tables["Tag_IOServer"];
                }
                    //节点为系统节点
                else if(this.treeView1.SelectedNode.Parent.Parent.Parent ==null)
                {
                    flagSysSub =true;
                    flagSystem =false;
                    selectNode =this.treeView1.SelectedNode;
                    this.tabControl1.SelectedIndex =1;
                    this.menuItem_AddIOServer.Enabled=false;
                    this.menuItem_AddSubSystem.Enabled=true;
                    this.menuItem_AddSystem.Enabled=true;
                    this.menuItem_AddTag.Enabled=false;
                    this.menuItem_DeleteSubSystem.Enabled=false;
                    this.menuItem_DeleteSystem.Enabled=true;
                    this.menuItem_UpdateTag.Enabled=false;
                    string ID =this.treeView1.SelectedNode.Text.ToString().Trim().Substring(0,10);
                    comm.CommandText="select * from AutoSystemInfo where AutoSysID =";
                    comm.CommandText+="'"+ID+"'";
                    da = new OracleDataAdapter(comm.CommandText,conn);
                    if(conn.State.ToString()=="Open")
                    {
                        da.Fill(ds,"tab_Sys");
                        conn.Close();
                    }
                    else
                    {
                        conn.Open();
                        da.Fill(ds,"tab_Sys");
                        conn.Close();
                    }
                    foreach(DataRow RowSys in ds.Tables["tab_Sys"].Rows)
                    {
                        this.txt_SysName.Text =RowSys[4].ToString().Trim();
                        this.txt_SysCode.Text =RowSys[3].ToString().Trim();
                        switch(RowSys[7].ToString())
                        {
                            case "0":this.cmb_SysMode.Text="实时";
                                break;
                            case "1":this.cmb_SysMode.Text="非实时";
                                break;
                            default:
                                break;
                        }
                    }
                    string IOID =this.treeView1.SelectedNode.Parent.Text.ToString().Trim().Substring(0,10);
                    comm.CommandText="select * from IOServerInfo where IOServerID =";
                    comm.CommandText+="'"+IOID+"'";
                    da =new OracleDataAdapter(comm.CommandText,conn);
                    if(conn.State.ToString()=="Open")
                    {
                        da.Fill(ds,"SysIOID");
                        conn.Close();
                    }
                    else
                    {
                        conn.Open();
                        da.Fill(ds,"SysIOID");
                        conn.Close();
                    }
                    foreach(DataRow RowSysID in ds.Tables["SysIOID"].Rows)
                    {
                        this.txt_SysIOID.Text =IOID;
                        this.txt_SysIOName.Text =RowSysID[2].ToString();
                    }
                    ds.Tables.Clear();
                    comm.CommandText="select TagID 列表ID ,TagInfo.AutoSubSysID 子系统ID,TagCode 节点编码,TagName 节点名称,TagType 节点类型,TagValueType 数据类型 ,TagMaxValue 最大值,TagMinValue 最小值,TagAlartMax 报警最大值 ,TagAlartMin 报警最小值,TagSaveInterval 存储时间间隔,TagSaveIgBand 存储变化盲区,TagInfo.CreateTime 创建时间,TagInfo.TimeStampMode 时戳确定方式,TagAlartPos 报警点,TagAlartPosDes 报警点描述,TagInfo.Description 描述 from TagInfo where AutoSubSysID in (select AutoSubSysID from"; 
                    comm.CommandText+=" AutoSubSystemInfo where AutoSysID in (select AutoSysID from AutoSystemInfo";
                    comm.CommandText+=" where AutoSysID =";
                    comm.CommandText+="'"+ID+"'";
                    comm.CommandText+="))";
                    da = new OracleDataAdapter(comm.CommandText,conn);
                    if(conn.State.ToString()=="Open")
                    {
                        da.Fill(ds,"Tag_Sys");
                        conn.Close();
                    }
                    else
                    {
                        conn.Open();
                        da.Fill(ds,"Tag_Sys");
                        conn.Close();
                    }
                    takeHideValue("Tag_Sys");
                    this.dataGrid1.DataSource=ds.Tables["Tag_Sys"];
                }
                    //节点为子系统节点
                else if(this.treeView1.SelectedNode.Parent.Parent.Parent.Parent ==null)
                {
                    flagSysSub =false;
                    selectNode =this.treeView1.SelectedNode;
                    this.tabControl1.SelectedIndex =3;
                    string ID = this.treeView1.SelectedNode.Text.ToString().Trim().Substring(0,10);
                    comm.CommandText="select count(*) from TagInfo where AutoSubSysID =";
                    comm.CommandText+="'"+ID+"'";
                    int count;
                    if(conn.State.ToString()=="Open")
                    {
                        count=Convert.ToInt32(comm.ExecuteScalar());
                        conn.Close();
                    }
                    else
                    {
                        conn.Open();
                        count =Convert.ToInt32(comm.ExecuteScalar());
                        conn.Close();
                    }
                    if(count>0)
                    {
                        this.menuItem_AddIOServer.Enabled=false;
                        this.menuItem_AddSubSystem.Enabled=true;
                        this.menuItem_AddSystem.Enabled=false;
                        this.menuItem_AddTag.Enabled=false;
                        this.menuItem_DeleteSubSystem.Enabled=true;
                        this.menuItem_DeleteSystem.Enabled=false;
                        this.menuItem_UpdateTag.Enabled=true;
                    }
                    else
                    {
                        this.menuItem_AddIOServer.Enabled=false;
                        this.menuItem_AddSubSystem.Enabled=true;
                        this.menuItem_AddSystem.Enabled=false;
                        this.menuItem_AddTag.Enabled=true;
                        this.menuItem_DeleteSubSystem.Enabled=true;
                        this.menuItem_DeleteSystem.Enabled=false;
                        this.menuItem_UpdateTag.Enabled=false;
                    }
                    comm.CommandText ="select * from AutoSubSystemInfo where AutoSubSysID =";
                    comm.CommandText+="'"+ID+"'";
                    da = new OracleDataAdapter(comm.CommandText,conn);
                    if(conn.State.ToString()=="Open")
                    {
                        da.Fill(ds,"SubSys");
                        conn.Close();
                    }
                    else
                    {
                        conn.Open();
                        da.Fill(ds,"SubSys");
                        conn.Close();
                    }
                    foreach(DataRow RowSubSys in ds.Tables["Subsys"].Rows)
                    {
                        this.txt_SubCode.Text =RowSubSys[2].ToString();
                        this.txt_SubName.Text =RowSubSys[3].ToString();
                        this.rtxt_SubInfo.Text=RowSubSys[5].ToString();
                    }
                    comm.CommandText="select * from AutoSystemInfo where AutoSysID =";
                    comm.CommandText+="'"+this.treeView1.SelectedNode.Parent.Text.ToString().Trim().Substring(0,10)+"'";
                    da = new OracleDataAdapter(comm.CommandText,conn);
                    if(conn.State.ToString()=="Open")
                    {
                        da.Fill(ds,"SubSysSysID");
                        conn.Close();
                    }
                    else
                    {
                        conn.Open();
                        da.Fill(ds,"SubSysSysID");
                        conn.Close();
                    }
                    foreach(DataRow RowSubSysSysID in ds.Tables["SubSysSysID"].Rows)
                    {
                        this.txt_SysSubName.Text=RowSubSysSysID[4].ToString();
                    }
                    ds.Tables.Clear();
                    comm.CommandText ="select TagID 列表ID ,AutoSubSysID 子系统ID,TagCode 节点编码,TagName 节点名称,TagType 节点类型,TagValueType 数据类型,TagMaxValue 最大值,TagMinValue 最小值,TagAlartMax 报警最大值 ,TagAlartMin 报警最小值,TagSaveInterval 存储时间间隔,TagSaveIgBand 存储变化盲区,CreateTime 创建时间,TimeStampMode 时戳确定方式,TagAlartPos 报警点,TagAlartPosDes 报警点描述,Description 描述 from TagInfo where AutoSubSysID =";
                    comm.CommandText+="'"+this.treeView1.SelectedNode.Text.ToString().Trim().Substring(0,10)+"'";
                    da = new OracleDataAdapter(comm.CommandText,conn);
                    if(conn.State.ToString()=="Open")
                    {
                        da.Fill(ds,"Tag_SubSys");
                        conn.Close();
                    }
                    else
                    {
                        conn.Open();
                        da.Fill(ds,"Tag_SubSys");
                        conn.Close();
                    }
                    takeHideValue("Tag_SubSys");
                    this.dataGrid1.DataSource =ds.Tables["Tag_SubSys"];
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message,title,MessageBoxButtons.OK,MessageBoxIcon.Information);
            }

        }

在DataSet中手动添加节点：

private DataTable IOServerNode = new DataTable("IOServerNode");
        private DataTable SubSysNode = new DataTable("SubSysNode");
        private DataTable SysNode = new DataTable("SysNode");
IOServerNode.Columns.Add("IOServerID",typeof(string));
            IOServerNode.Columns.Add("IOServerName",typeof(string));
            SysNode.Columns.Add("AutoSysID",typeof(string));
            SysNode.Columns.Add("AutoSysName",typeof(string));
            SysNode.Columns.Add("IOServerID",typeof(string));
            SubSysNode.Columns.Add("AutoSubSysID",typeof(string));
            SubSysNode.Columns.Add("AutoSubSysName",typeof(string));
            SubSysNode.Columns.Add("AutoSysID",typeof(string));
            dsNode.Tables.Add(IOServerNode);
            dsNode.Tables.Add(SysNode);
            dsNode.Tables.Add(SubSysNode);
//            DataRowCollection rc;
                    //            DataRow newRow;
                    //            object [] rowValues = new object[2];
                    //            rowValues[0]="0000000210";
                    //            rowValues[1]="这是一个测试";
                    //            rc =dsNode.Tables["IOServerNode"].Rows;
                    //            newRow =dsNode.Tables["IOServerNode"].NewRow();
                    //            newRow = rc.Add(rowValues);
                    //dsNode.Tables["IOServerNode"].ImportRow(newRow);