C#winform TreeView编程
TreeView右键菜单从数据库中读取,插入,删除,查找(高亮显示并展开),编辑(即地编辑)的例子
这个项目包括二个文件,分别为From1.cs and FormCommon.cs,一个配置文件App.config
Form1.cs
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace Tree
{
///
/// Form1 的摘要说明。
///
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TreeView treeView1;
private System.Data.SqlClient.SqlConnection sqlConnection1;
///
/// 必需的设计器变量。
///
private System.ComponentModel.Container components = null ;
private System.Windows.Forms.ContextMenu contextMenu1;
private System.Windows.Forms.MenuItem menuAdd;
private System.Windows.Forms.MenuItem menuDel;
private System.Windows.Forms.MenuItem menuEdit;
private System.Windows.Forms.MenuItem menuSearch;
private ArrayList list;
private ArrayList listnode;
private string strcomm;
private bool isselected = true ;
private System.Windows.Forms.ListBox listBox1;
private TreeNode selectnode ;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
///
/// 清理所有正在使用的资源。
///
protected override void Dispose( bool disposing )
{
if ( disposing )
{
if (components != null )
{
components.Dispose();
}
}
base .Dispose( disposing );
}
#region Windows 窗体设计器生成的代码
///
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///
private void InitializeComponent()
{
this .treeView1 = new System.Windows.Forms.TreeView();
this .contextMenu1 = new System.Windows.Forms.ContextMenu();
this .menuAdd = new System.Windows.Forms.MenuItem();
this .menuDel = new System.Windows.Forms.MenuItem();
this .menuEdit = new System.Windows.Forms.MenuItem();
this .menuSearch = new System.Windows.Forms.MenuItem();
this .sqlConnection1 = new System.Data.SqlClient.SqlConnection();
this .listBox1 = new System.Windows.Forms.ListBox();
this .SuspendLayout();
//
// treeView1
//
this .treeView1.AllowDrop = true ;
this .treeView1.ContextMenu = this .contextMenu1;
this .treeView1.HotTracking = true ;
this .treeView1.ImageIndex = - 1 ;
this .treeView1.LabelEdit = true ;
this .treeView1.Location = new System.Drawing.Point( 16 , 16 );
this .treeView1.Name = " treeView1 " ;
this .treeView1.SelectedImageIndex = - 1 ;
this .treeView1.Size = new System.Drawing.Size( 200 , 388 );
this .treeView1.TabIndex = 0 ;
this .treeView1.MouseDown += new System.Windows.Forms.MouseEventHandler( this .treeView1_MouseDown);
this .treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler( this .treeView1_AfterSelect);
this .treeView1.AfterLabelEdit += new System.Windows.Forms.NodeLabelEditEventHandler( this .treeView1_AfterLabelEdit);
//
// contextMenu1
//
this .contextMenu1.MenuItems.AddRange( new System.Windows.Forms.MenuItem[] {
this .menuAdd,
this .menuDel,
this .menuEdit,
this .menuSearch});
//
// menuAdd
//
this .menuAdd.Index = 0 ;
this .menuAdd.Text = " 新增 " ;
this .menuAdd.Click += new System.EventHandler( this .menuAdd_Click);
//
// menuDel
//
this .menuDel.Index = 1 ;
this .menuDel.Text = " 删除 " ;
this .menuDel.Click += new System.EventHandler( this .menuDel_Click);
//
// menuEdit
//
this .menuEdit.Index = 2 ;
this .menuEdit.Text = " 编辑 " ;
this .menuEdit.Click += new System.EventHandler( this .menuEdit_Click);
//
// menuSearch
//
this .menuSearch.Index = 3 ;
this .menuSearch.Text = " 查找 " ;
this .menuSearch.Click += new System.EventHandler( this .menuSearch_Click);
//
// listBox1
//
this .listBox1.ItemHeight = 12 ;
this .listBox1.Location = new System.Drawing.Point( 244 , 20 );
this .listBox1.Name = " listBox1 " ;
this .listBox1.Size = new System.Drawing.Size( 288 , 376 );
this .listBox1.TabIndex = 1 ;
//
// Form1
//
this .AutoScaleBaseSize = new System.Drawing.Size( 6 , 14 );
this .ClientSize = new System.Drawing.Size( 564 , 422 );
this .Controls.Add( this .listBox1);
this .Controls.Add( this .treeView1);
this .Name = " Form1 " ;
this .Text = " Form1 " ;
this .Load += new System.EventHandler( this .Form1_Load);
this .ResumeLayout( false );
}
#endregion
///
/// 应用程序的主入口点。
///
[STAThread]
static void Main()
{
Application.Run( new Form1());
}
private DataSet ds;
private SqlDataAdapter sqlDataAdapter1;
private int maxnodeid;
private void Form1_Load( object sender, System.EventArgs e)
{
string strconn = ConfigurationSettings.AppSettings[ " ConnStr " ];
sqlConnection1 = new SqlConnection(strconn);
this .sqlConnection1.Open();
// 填充DataSet
this .CreateDataSet();
// 从数据库中读取数据，通过递归生成树。
InitTree( this .treeView1.Nodes, " 0 " );
}
private void CreateDataSet()
{
this .sqlDataAdapter1 = new SqlDataAdapter( " select * from s_menu " , this .sqlConnection1);
this .ds = new DataSet();
this .sqlDataAdapter1.Fill(ds, " tree " );
}
private void InitTree(TreeNodeCollection Nds, string parentId)
{
DataView dv = new DataView();
TreeNode tmpNd;
string intId;
dv.Table = ds.Tables[ " tree " ];
dv.RowFilter = " ParentId=' " + parentId + " ' " ;
foreach (DataRowView drv in dv)
{
tmpNd = new TreeNode();
tmpNd.Tag = drv[ " NodeId " ].ToString();
tmpNd.Text = drv[ " NodeName " ].ToString();
Nds.Add(tmpNd);
intId = drv[ " ParentId " ].ToString();
InitTree(tmpNd.Nodes,tmpNd.Tag.ToString());
}
}
// 新增节点操作
private void insert( string type)
{ // 判断是新增树节点,还是子节点.
string strinsert = " insert into s_menu values('{0}','{1}','{2}') " ;
string strformat = "" ;
if (type == " sub " )
strformat = string .Format(strinsert,maxnodeid.ToString(), this .selectnode.Tag.ToString(), this .strcomm);
else
strformat = string .Format(strinsert,maxnodeid.ToString(), " 0 " , this .strcomm);
SqlCommand cmd = new SqlCommand(strformat, this .sqlConnection1);
cmd.ExecuteNonQuery();
}
// 为新增节点算出最大的节点值,并以此值作为新增的节点ID值
private int GetMaxNodeid()
{
int pre = 0 ,last = 0 ;
DataSet maxds = new DataSet();
this .sqlDataAdapter1 = new SqlDataAdapter( " select nodeid from s_menu order by nodeid " , this .sqlConnection1);
this .sqlDataAdapter1.Fill(maxds);
for ( int i = 0 ;i{
if (i + 1 {
pre = int .Parse(maxds.Tables[ 0 ].Rows[i][ 0 ].ToString());
last = int .Parse(maxds.Tables[ 0 ].Rows[i + 1 ][ 0 ].ToString());
if (last - pre != 1 )
return pre + 1 ;
}
}
return last + 1 ;
}
private void getallnode(TreeNode tn)
{
foreach (TreeNode node in tn.Nodes)
{
list.Add(node.Tag.ToString());
if (node.Nodes.Count > 0 )
{
getallnode(node);
}
}
}
private void treeView1_MouseDown( object sender, System.Windows.Forms.MouseEventArgs e)
{
// 判断是否点击了某个节点
this .selectnode = this .treeView1.GetNodeAt (e.X ,e.Y );
if (selectnode == null )
this .isselected = false ;
else
this .isselected = true ;
}
private void menuAdd_Click( object sender, System.EventArgs e)
{ // 判断是否点击了某个节点,若没有点击了,则是新增一个树节点
if (isselected == false )
{ // 算出新增树节点的ID值
maxnodeid = GetMaxNodeid();
TreeNode tmpNd = new TreeNode();
// 赋值
tmpNd.Tag = this .maxnodeid.ToString();
FormCommon frmCommon = new FormCommon();
DialogResult result = frmCommon.ShowDialog();
if (result == DialogResult.OK)
{ // 取到新增树节点的文本值
tmpNd.Text = frmCommon.strcomm;
this .strcomm = frmCommon.strcomm;
// 新增树节点
this .treeView1.Nodes.Add(tmpNd);
// 插入数据库(说明插入的是树节点)
this .insert( " root " );
// 展开
this .selectnode.Expand();
}
}
else
{ // 判断是否点击了某个节点,若点击了,则是新增一个子节点
this .contextAddSub();
}
}
private void contextAddSub()
{ // 得到新增子节点的ID值
maxnodeid = GetMaxNodeid();
TreeNode tmpNd = new TreeNode();
// 赋值
tmpNd.Tag = this .maxnodeid.ToString();
FormCommon frmCommon = new FormCommon();
DialogResult result = frmCommon.ShowDialog();
if (result == DialogResult.OK)
{ // 取到新增树节点的文本值
tmpNd.Text = frmCommon.strcomm;
this .strcomm = frmCommon.strcomm;
// 新增子节点
this .selectnode.Nodes.Add(tmpNd);
// 插入数据库(说明插入的是子节点)
this .insert( " sub " );
// 展开
this .treeView1.SelectedNode.Expand();
}
}
// 删除节点操作
private void menuDel_Click( object sender, System.EventArgs e)
{ // 新建一个ArrayList,用于保存要删除的节点下边的所有子节点
list = new ArrayList();
if ( this .isselected == true )
{ // 得到删除的节点下边的所有子节点
getallnode( this .selectnode);
// 把要删除的节点也加进去
list.Add( this .selectnode.Tag.ToString());
// 循环从数据库中删除
for ( int i = 0 ;i{
string strdel = " delete s_menu where nodeid='{0}' " ;
string strformat = "" ;
strformat = string .Format(strdel,list[i]);
SqlCommand cmd = new SqlCommand(strformat, this .sqlConnection1);
cmd.ExecuteNonQuery();
}
// 从树中删除
this .selectnode.Remove();
}
}
// 修改节点的值
private void menuEdit_Click( object sender, System.EventArgs e)
{
if ( this .isselected == true )
{
FormCommon frmCommon = new FormCommon();
DialogResult result = frmCommon.ShowDialog();
if (result == DialogResult.OK)
{
string strdel = " update s_menu set nodename= '{1}' where nodeid='{0}' " ;
string strformat = "" ;
strformat = string .Format(strdel, this .selectnode.Tag.ToString(),frmCommon.strcomm);
SqlCommand cmd = new SqlCommand(strformat, this .sqlConnection1);
cmd.ExecuteNonQuery();
this .selectnode.Text = frmCommon.strcomm;
}
}
}
// 遍历所有节点.查找值
private void getvaluenode(TreeNodeCollection tn, string value)
{
foreach (TreeNode node in tn)
{
if (node.Nodes.Count > 0 )
{
getvaluenode(node.Nodes,value);
}
if (node.Text == value)
listnode.Add(node);
}
}
private void menuSearch_Click( object sender, System.EventArgs e)
{
int j,k;
this .listnode = new ArrayList();
FormCommon frmCommon = new FormCommon();
DialogResult result = frmCommon.ShowDialog();
if (result == DialogResult.OK)
{
TreeNode n = new TreeNode();
TreeNode temp = new TreeNode();
// 下面的函数是填充listnode;
getvaluenode( this .treeView1.Nodes,frmCommon.strcomm);
for ( int i = 0 ;i{
j = 0 ;k = 0 ;
n = (TreeNode)listnode[i];
if (n != null )
{
temp = n;
// 得到上面结点的数量,并将数量保存到变量j;
for (;n.Parent != null ;)
{
n = n.Parent;
j ++ ;
}
// 恢复原值
n = temp;
// 新建一个树结点数组做保存得到查询到的所有节点.
TreeNode[] m = new TreeNode[j];
for (;n.Parent != null ;)
{
n = n.Parent;
m[k] = n;
k ++ ;
}
for ( int p = 0 ;pm[p].Expand();
n = temp;
n.ForeColor = Color.Red;
}
}
}
}
private void treeView1_AfterLabelEdit( object sender, System.Windows.Forms.NodeLabelEditEventArgs e)
{
if ( this .treeView1.SelectedNode.Text != null )
{
string strdel = " update s_menu set nodename= '{1}' where nodeid='{0}' " ;
string strformat = "" ;strformat = string .Format(strdel, this .treeView1.SelectedNode.Tag.ToString(),e.Label.ToString());SqlCommand cmd = new SqlCommand(strformat, this .sqlConnection1);
cmd.ExecuteNonQuery();
}
}
private void treeView1_AfterSelect( object sender, System.Windows.Forms.TreeViewEventArgs e)
{
this .listBox1.Items.Clear();
this .listBox1.Items.Add( this .treeView1.SelectedNode.FullPath.ToString());
}
}
}
//formCommon.cs
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
namespace Tree
{
///
/// FormCommon 的摘要说明。
///
public class FormCommon : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox txtCommon;
private System.Windows.Forms.Button btnOK;
///
/// 必需的设计器变量。
///
private System.ComponentModel.Container components = null ;
public string strcomm;
public FormCommon()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
///
/// 清理所有正在使用的资源。
///
protected override void Dispose( bool disposing )
{
if ( disposing )
{
if (components != null )
{
components.Dispose();
}
}
base .Dispose( disposing );
}
#region Windows 窗体设计器生成的代码
///
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///
private void InitializeComponent()
{
this .txtCommon = new System.Windows.Forms.TextBox();
this .btnOK = new System.Windows.Forms.Button();
this .SuspendLayout();
//
// txtCommon
//
this .txtCommon.Location = new System.Drawing.Point( 36 , 16 );
this .txtCommon.Name = " txtCommon " ;
this .txtCommon.TabIndex = 0 ;
this .txtCommon.Text = "" ;
//
// btnOK
//
this .btnOK.DialogResult = System.Windows.Forms.DialogResult.OK;
this .btnOK.Location = new System.Drawing.Point( 48 , 52 );
this .btnOK.Name = " btnOK " ;
this .btnOK.TabIndex = 1 ;
this .btnOK.Text = " 确定 " ;
this .btnOK.Click += new System.EventHandler( this .btnOK_Click);
//
// FormCommon
//
this .AutoScaleBaseSize = new System.Drawing.Size( 6 , 14 );
this .ClientSize = new System.Drawing.Size( 176 , 98 );
this .Controls.Add( this .btnOK);
this .Controls.Add( this .txtCommon);
this .Name = " FormCommon " ;
this .Text = " FormCommon " ;
this .ResumeLayout( false );
}
#endregion
private void btnOK_Click( object sender, System.EventArgs e)
{
if ( this .txtCommon.Text == "" )
{
MessageBox.Show( " 不能为空 " );
this .DialogResult = DialogResult.None;
}
else
this .strcomm = this .txtCommon.Text;
}
}
}
//配置文件App.Config
if exists (select * from dbo.sysobjects where id = object_id(N ' [dbo].[S_Menu] ' ) and OBJECTPROPERTY(id, N ' IsUserTable ' ) = 1 )
drop table [dbo].[S_Menu]
GO
CREATE TABLE [dbo].[S_Menu] (
[NodeId] [ char ] ( 6 ) COLLATE Chinese_PRC_CI_AS NULL ,
[ParentId] [ char ] ( 6 ) COLLATE Chinese_PRC_CI_AS NULL ,
[NodeName] [nvarchar] ( 50 ) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
GO______________________________
Nodeid parentid nodename
10000 0 湖北省
10001 10000 武汉市
10002 10000 宜昌市
10003 0 广东省
转载于:https://www.cnblogs.com/CampagniaTe/archive/2007/07/31/837309.html
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