Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click

    ' Set FontMustExist to true, which causes message box error
    ' if the user enters a font that does not exist. 
    FontDialog1.FontMustExist = True

    ' Set a minimum and maximum size to be
    ' shown in the FontDialog.
    FontDialog1.MaxSize = 32
    FontDialog1.MinSize = 18

    ' Show the Apply button in the dialog.
    FontDialog1.ShowApply = True

    ' Do not show effects such as Underline
    ' and Bold.
    FontDialog1.ShowEffects = False

    ' Save the existing font.
    Dim oldFont As System.Drawing.Font = Me.Font

    ' Show the dialog and save the result.
    Dim result As DialogResult = FontDialog1.ShowDialog()

    ' If The OK button in the Font dialog box is clicked, 
    ' set all the controls' fonts to the chosen font by
    ' calling the FontDialog1_Apply method.
    If result = DialogResult.OK Then
        FontDialog1_Apply(Me.Button1, New System.EventArgs)

        ' If the Cancel button is clicked, set the controls'
        ' fonts back to the original font.
    ElseIf (result = DialogResult.Cancel) Then
        Dim containedControl As Control
        For Each containedControl In Me.Controls
            containedControl.Font = oldFont
        Next

    End If
End Sub

' Handle the Apply event by setting all controls' fonts to 
' the chosen font. 
Private Sub FontDialog1_Apply(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles FontDialog1.Apply

    Me.Font = FontDialog1.Font
    Dim containedControl As Control
    For Each containedControl In Me.Controls
        containedControl.Font = FontDialog1.Font
    Next
End Sub

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

public class FontDialogApplyAction
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub btnSetFont_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnSetFont.Click

        Dim old_font As Font = Me.Font
        Dim old_color As Color = Me.ForeColor

        dlgFont.ShowColor = True    ' Let the user select font color.   
        dlgFont.ShowEffects = True  ' Let the user select Strikeout and Underline.
        dlgFont.ShowApply = True    ' Display the Apply button.
        dlgFont.Font = Me.Font      ' Set the initial font.

        If dlgFont.ShowDialog() = DialogResult.OK Then
            SetFormFont(dlgFont.Font, dlgFont.Color)
        Else
            SetFormFont(old_font, old_color)
        End If
    End Sub

    Private Sub dlgFont_Apply(ByVal sender As Object, _
     ByVal e As System.EventArgs) Handles dlgFont.Apply
        Dim dlg As FontDialog = DirectCast(sender, FontDialog)
        SetFormFont(dlg.Font, dlg.Color)
    End Sub

    Private Sub SetFormFont(ByVal new_font As Font, ByVal new_color As Color)
        Me.Font = new_font
        Me.ForeColor = new_color
    End Sub
End Class
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub

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

    '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.btnSetFont = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.dlgFont = New System.Windows.Forms.FontDialog
        Me.SuspendLayout()
        '
        'btnSetFont
        '
        Me.btnSetFont.Location = New System.Drawing.Point(8, 8)
        Me.btnSetFont.Name = "btnSetFont"
        Me.btnSetFont.Size = New System.Drawing.Size(96, 32)
        Me.btnSetFont.TabIndex = 0
        Me.btnSetFont.Text = "Set Font"
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(8, 48)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(35, 13)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "Label1"
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(8, 80)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(160, 20)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = "Here's a TextBox"
        '
        'Form1
        '
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None
        Me.ClientSize = New System.Drawing.Size(325, 273)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.btnSetFont)
        Me.Name = "Form1"
        Me.Text = "UseFontDialogWithShowEffects"
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub
    Friend WithEvents btnSetFont As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents dlgFont As System.Windows.Forms.FontDialog

End Class