VB.NET CheckedListBox.ItemCheck事件代码示例

Private Sub CheckedListBox1_ItemCheck(sender as Object, e as ItemCheckEventArgs) _ 
     Handles CheckedListBox1.ItemCheck

    Dim messageBoxVB as New System.Text.StringBuilder()
    messageBoxVB.AppendFormat("{0} = {1}", "Index", e.Index)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "NewValue", e.NewValue)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "CurrentValue", e.CurrentValue)
    messageBoxVB.AppendLine()
    MessageBox.Show(messageBoxVB.ToString(),"ItemCheck Event")

End Sub

' 导入命名空间
Imports System
Imports System.Drawing
Imports System.Windows.Forms

Public Class MainClass

   Shared Sub Main()
        Dim myform As Form = New FrmCheckedListBox()
        Application.Run(myform)

   End Sub ' Main

End Class

Public Class FrmCheckedListBox
   Inherits Form

#Region " Windows Form Designer generated code "

   Public Sub New()
      MyBase.New()

      'This call is required by the Windows Form Designer.
      InitializeComponent()

      'Add any initialization after the InitializeComponent() call
   End Sub

   'Form overrides dispose to clean up the component list.
   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

   ' list of available book titles
   Friend WithEvents chklstInput As CheckedListBox

   ' user selection list
   Friend WithEvents lstDisplay As ListBox

   'Required by the Windows Form Designer
   Private components As System.ComponentModel.Container

   'NOTE: The following procedure is required by the Windows Form Designer
   'It can be modified using the Windows Form Designer.  
   'Do not modify it using the code editor.
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
      Me.chklstInput = New System.Windows.Forms.CheckedListBox()
      Me.lstDisplay = New System.Windows.Forms.ListBox()
      Me.SuspendLayout()
      '
      'chklstInput
      '
      Me.chklstInput.HorizontalScrollbar = True
      Me.chklstInput.Items.AddRange(New Object() {"C++", "Java", "VB", "C#", "Perl", "Python HTP", "C", "SQL"})
      Me.chklstInput.Location = New System.Drawing.Point(16, 16)
      Me.chklstInput.Name = "chklstInput"
      Me.chklstInput.Size = New System.Drawing.Size(152, 124)
      Me.chklstInput.TabIndex = 1
      '
      'lstDisplay
      '
      Me.lstDisplay.Anchor = (System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Right)
      Me.lstDisplay.HorizontalScrollbar = True
      Me.lstDisplay.Location = New System.Drawing.Point(184, 16)
      Me.lstDisplay.Name = "lstDisplay"
      Me.lstDisplay.Size = New System.Drawing.Size(128, 121)
      Me.lstDisplay.TabIndex = 2
      '
      'FrmCheckedListBox
      '
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(328, 157)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lstDisplay, Me.chklstInput})
      Me.Name = "FrmCheckedListBox"
      Me.Text = "Checked List Box Test"
      Me.ResumeLayout(False)

   End Sub

#End Region

   Private Sub chklstInput_ItemCheck _
      (ByVal sender As System.Object, _
      ByVal e As System.Windows.Forms.ItemCheckEventArgs) _
      Handles chklstInput.ItemCheck

      Dim item As String = chklstInput.SelectedItem

      If e.NewValue = CheckState.Checked Then
         lstDisplay.Items.Add(item)
      Else
         lstDisplay.Items.Remove(item)
      End If

   End Sub

End Class