添加一个下拉框到DataGrid (转)

添加一个下拉框到DataGrid (转)[@more@]

本实例利用Paint方法添加一个下拉框到DataGrid1上 XML:namespace prefix = o ns = "urn:schemas-microsoft-com:Office:office" />

1、新建一个Visual Basic Project 。
2、添加一个DataGrid control到窗体上。
3、加入以下代码

 

Imports System.Data.sqlClient

Public Class Form1

  Inherits System.windows.Forms.Form

#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 DataGrid1 As System.Windows.Forms.DataGrid

  buggerStepThrough()> Private Sub InitializeComponent()

  Me.DataGrid1 = New System.Windows.Forms.DataGrid()

  CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).BeginInit()

   Me.SuspendLayout()

  '

  'DataGrid1

  '

  Me.DataGrid1.DataMember = ""

  Me.DataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText

  Me.DataGrid1.Location = New System.Drawing.Point(72, 56)

  Me.DataGrid1.Name = "DataGrid1"

  Me.DataGrid1.Size = New System.Drawing.Size(416, 184)

  Me.DataGrid1.TabIndex = 0

  '

  'Form1

  '

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

  Me.ClientSize = New System.Drawing.Size(552, 285)

  Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.DataGrid1})

  Me.Name = "Form1"

  Me.Text = "Form1"

  CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).EndInit()

  Me.ResumeLayout(False)

  End Sub

#End Region

  Public MyCombo As New ComboBox()

  Dim con As New SqlConnection("server=lihg;uid=sa;pwd=sa;database=northwind")

  Dim daEmp As New SqlDataAdapter("select * From Employees", con)

  Public ds As New DataSet()

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

  AddHandler MyCombo.TextChanged, AddressOf Ctrls_TextChanged

  'Fill ComboBox list.

  MyCombo.Name = "MyCombo"

  MyCombo.Visible = False

  MyCombo.Items.Clear()

  MyCombo.Items.Add("Sales Representative")

  MyCombo.Items.Add("Inside Sales Coordinator")

  MyCombo.Items.Add("Vice President, Sales")

  MyCombo.Items.Add("Sales Manager")

  MyCombo.Items.Add("Flunky")

  daEmp.Fill(ds, "Employees")

  'Set the RowHeight of the DataGrid to the height of the ComboBox.

  DataGrid1.PreferredRowHeight = MyCombo.Height

  DataGrid1.Datasource = ds

  DataGrid1.DataMember = "Employees"

  'Add ComboBox to the Control collection of the DataGrid.

  DataGrid1.Controls.Add(MyCombo)

  End Sub

  Private Sub DataGrid1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles DataGrid1.Paint

  If DataGrid1.CurrentCell.ColumnNumber = 3 Then

  MyCombo.Width = DataGrid1.GetCurrentCellBounds.Width

  End If

  End Sub

  Private Sub Ctrls_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)

  If DataGrid1.CurrentCell.ColumnNumber = 3 Then

  MyCombo.Visible = False

  If DataGrid1.Item(DataGrid1.CurrentCell) & "" = "" Then

  SendKeys.Send("*")

  End If

  DataGrid1.Item(DataGrid1.CurrentCell) = MyCombo.Text

  End If

  End Sub

  Private Sub DataGrid1_CurrentCellChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DataGrid1.CurrentCellChanged

  If DataGrid1.CurrentCell.ColumnNumber = 3 Then

  MyCombo.Visible = False

  MyCombo.Width = 0

  MyCombo.Left = DataGrid1.GetCurrentCellBounds.Left

  MyCombo.Top = DataGrid1.GetCurrentCellBounds.Top

  MyCombo.Text = DataGrid1.Item(DataGrid1.CurrentCell) & ""

  MyCombo.Visible = True

  Else

  MyCombo.Visible = False

  MyCombo.Width = 0

  End If

  End Sub

  Private Sub DataGrid1_Scroll(ByVal sender As Object, ByVal e As System.EventArgs) Handles DataGrid1.Scroll

  MyCombo.Visible = False

  MyCombo.Width = 0

  End Sub

  Private Sub DataGrid1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles DataGrid1.Click

  MyCombo.Visible = False

  MyCombo.Width = 0

  End Sub

End Class

4、修连接字符串Dim con As New SqlConnection("server=lihg;uid=sa;pwd=sa;database=northwind")，使能连接上数据库
5、F5运行

 

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转载于:http://blog.itpub.net/10752043/viewspace-993482/