Winform 树型菜单例子

核心代码：

Imports System.Data.SqlClient

Public Class Form1

Inherits System.Windows.Forms.Form

Private ds As New DataSet()

' AddTree递归函数每次都要用到数据集中的一个表，所以定义成private

#Region " Windows 窗体设计器生成的代码 "

Public Sub New()

MyBase.New()

'该调用是 Windows 窗体设计器所必需的。

InitializeComponent()

'在 InitializeComponent() 调用之后添加任何初始化

End Sub

'窗体重写处置以清理组件列表。

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)

If disposing Then

If Not (components Is Nothing) Then

components.Dispose()

End If

End If

MyBase.Dispose(disposing)

End Sub

'Windows 窗体设计器所必需的

Private components As System.ComponentModel.IContainer

'注意：以下过程是 Windows 窗体设计器所必需的

'可以使用 Windows 窗体设计器修改此过程。

'不要使用代码编辑器修改它。

Friend WithEvents TreeView1 As System.Windows.Forms.TreeView

Friend WithEvents Button1 As System.Windows.Forms.Button

Friend WithEvents Button2 As System.Windows.Forms.Button

Friend WithEvents ImageList1 As System.Windows.Forms.ImageList

<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

Me.components = New System.ComponentModel.Container

Dim resources As System.ComponentModel.ComponentResourceManager = New System.ComponentModel.ComponentResourceManager(GetType(Form1))

Me.TreeView1 = New System.Windows.Forms.TreeView

Me.ImageList1 = New System.Windows.Forms.ImageList(Me.components)

Me.Button1 = New System.Windows.Forms.Button

Me.Button2 = New System.Windows.Forms.Button

Me.SuspendLayout()

'

'TreeView1

'

Me.TreeView1.ImageIndex = 0

Me.TreeView1.ImageList = Me.ImageList1

Me.TreeView1.Location = New System.Drawing.Point(0, 0)

Me.TreeView1.Name = "TreeView1"

Me.TreeView1.SelectedImageIndex = 0

Me.TreeView1.Size = New System.Drawing.Size(272, 476)

Me.TreeView1.TabIndex = 0

'

'ImageList1

'

Me.ImageList1.ImageStream = CType(resources.GetObject("ImageList1.ImageStream"), System.Windows.Forms.ImageListStreamer)

Me.ImageList1.TransparentColor = System.Drawing.Color.Transparent

Me.ImageList1.Images.SetKeyName(0, "")

'

'Button1

'

Me.Button1.Location = New System.Drawing.Point(288, 16)

Me.Button1.Name = "Button1"

Me.Button1.Size = New System.Drawing.Size(75, 23)

Me.Button1.TabIndex = 1

Me.Button1.Text = "打开窗体二"

'

'Button2

'

Me.Button2.Location = New System.Drawing.Point(288, 48)

Me.Button2.Name = "Button2"

Me.Button2.Size = New System.Drawing.Size(75, 23)

Me.Button2.TabIndex = 2

Me.Button2.Text = "Button2"

'

'Form1

'

Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)

Me.ClientSize = New System.Drawing.Size(376, 488)

Me.Controls.Add(Me.Button2)

Me.Controls.Add(Me.Button1)

Me.Controls.Add(Me.TreeView1)

Me.Name = "Form1"

Me.Text = "用存储过程加载树"

Me.ResumeLayout(False)

End Sub

#End Region

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

' '定义数据库连接

Dim CN As New SqlConnection()

Try

'初始化连接字符串

CN.ConnectionString = "data source =255.255.255.255;initial catalog=baobiaopri;persist security info=False;user id=sa;Password=admin@sa;"

CN.Open()

'添加命令，从数据库中得到数据

Dim sqlCmd As New SqlCommand()

sqlCmd.Connection = CN

Dim sql As String = ""

'sql = "select '1' as privilegeid , 'http://home.ghy.com.cn/ReportServer' as formname , '业务报表' as description , 0 as parentid"

'sql = sql + " union all "

'sql = sql + " select '2' as privilegeid , 'http://home.ghy.com.cn/ReportServer' as formname , '处理过的表单' as description , 0 as parentid"

'sql = sql + " union all"

'sql = sql + " select '3' as privilegeid , 'http://home.ghy.com.cn/ReportServer' as formname , '我提交的表单' as description , 0 as parentid"

'sql = sql + " union all"

'sql = sql + " select '4' as privilegeid , 'http://home.ghy.com.cn/ReportServer' as formname , '其他可访问的表单' as description , 0 as parentid"

'sql = sql + " union all"

'sql = sql + " select '5' as privilegeid , 'http://home.ghy.com.cn/ReportServer' as formname , '任务夹' as description , 0 as parentid"

'sql = sql + " union all"

'sql = sql + " select '6' as privilegeid , 'http://home.ghy.com.cn/ReportServer' as formname , '子子菜单' as description , 1002 as parentid"

'sql = sql + " union all"

'sql = sql + " select '7' as privilegeid , 'http://home.ghy.com.cn/ReportServer' as formname , '子子菜单' as description , 6 as parentid"

'sql = sql + " union all"

'sql = sql + " select '8' as privilegeid , 'http://home.ghy.com.cn/ReportServer' as formname , '子子子菜单' as description , 7 as parentid"

'sql = sql + " union all"

sql = sql + " select Privileges.PrivilegeID, Privileges.formname , Privileges.description, Privileges.ParentID "

sql = sql + " from Privileges inner join User_Privileges on Privileges.Privilegeid = User_Privileges.Privilegeid"

sql = sql + " where User_Privileges.userid = 'yinqingyue' order by Privileges.PrivilegeID"

sqlCmd.CommandText = sql

'sqlCmd.CommandText = "select * from tbtree"

sqlCmd.CommandType = CommandType.Text

Dim adp As SqlDataAdapter = New SqlDataAdapter(sqlCmd)

adp.Fill(ds)

Catch ex As Exception

MsgBox(ex.Message)

Finally

CN.Close()

End Try

'调用递归函数，完成树形结构的生成

AddTree(0, Nothing)

End Sub

'递归添加树的节点

Private Sub AddTree(ByVal ParentID As Integer, ByVal pNode As TreeNode)

Dim Node As TreeNode

Dim dvTree As New DataView()

dvTree = New DataView(ds.Tables(0))

'过滤ParentID,得到当前的所有子节点

dvTree.RowFilter = "PARENTID = " + ParentID.ToString

Dim Row As DataRowView

For Each Row In dvTree

If pNode Is Nothing Then '判断是否根节点

'添加根节点

'Node = TreeView1.Nodes.Add(Row("context").ToString())

Node = TreeView1.Nodes.Add(Row("Description").ToString())

'再次递归

AddTree(Int32.Parse(Row("PrivilegeID").ToString()), Node)

Else

'添加当前节点的子节点

Node = pNode.Nodes.Add(Row("Description").ToString())

'再次递归

AddTree(Int32.Parse(Row("PrivilegeID").ToString()), Node)

End If

Node.EnsureVisible()

Next

End Sub

End Class