C#应用程序treeview绑定数据库

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()); 


}

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