form1.vb

Source code for VB.NET book - Chapter 1.

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 dispose 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 Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents ProgressBar1 As System.Windows.Forms.ProgressBar
    Friend WithEvents ProgressBar2 As System.Windows.Forms.ProgressBar
    Friend WithEvents ProgressBar3 As System.Windows.Forms.ProgressBar
    Friend WithEvents ProgressBar4 As System.Windows.Forms.ProgressBar
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.Label4 = New System.Windows.Forms.Label
        Me.ProgressBar1 = New System.Windows.Forms.ProgressBar
        Me.ProgressBar2 = New System.Windows.Forms.ProgressBar
        Me.ProgressBar3 = New System.Windows.Forms.ProgressBar
        Me.ProgressBar4 = New System.Windows.Forms.ProgressBar
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(24, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(40, 24)
        Me.Label1.TabIndex = 0
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(24, 56)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(40, 23)
        Me.Label2.TabIndex = 1
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(24, 88)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(40, 24)
        Me.Label3.TabIndex = 2
        '
        'Label4
        '
        Me.Label4.Location = New System.Drawing.Point(24, 128)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(40, 24)
        Me.Label4.TabIndex = 3
        '
        'ProgressBar1
        '
        Me.ProgressBar1.Location = New System.Drawing.Point(88, 24)
        Me.ProgressBar1.Maximum = 20
        Me.ProgressBar1.Name = "ProgressBar1"
        Me.ProgressBar1.Size = New System.Drawing.Size(176, 16)
        Me.ProgressBar1.TabIndex = 4
        '
        'ProgressBar2
        '
        Me.ProgressBar2.Location = New System.Drawing.Point(88, 56)
        Me.ProgressBar2.Maximum = 20
        Me.ProgressBar2.Name = "ProgressBar2"
        Me.ProgressBar2.Size = New System.Drawing.Size(176, 16)
        Me.ProgressBar2.TabIndex = 5
        '
        'ProgressBar3
        '
        Me.ProgressBar3.Location = New System.Drawing.Point(88, 88)
        Me.ProgressBar3.Maximum = 20
        Me.ProgressBar3.Name = "ProgressBar3"
        Me.ProgressBar3.Size = New System.Drawing.Size(176, 16)
        Me.ProgressBar3.TabIndex = 6
        '
        'ProgressBar4
        '
        Me.ProgressBar4.Location = New System.Drawing.Point(88, 120)
        Me.ProgressBar4.Maximum = 20
        Me.ProgressBar4.Name = "ProgressBar4"
        Me.ProgressBar4.Size = New System.Drawing.Size(176, 16)
        Me.ProgressBar4.TabIndex = 7
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(112, 152)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(64, 24)
        Me.Button1.TabIndex = 8
        Me.Button1.Text = "开  始"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 190)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.ProgressBar4)
        Me.Controls.Add(Me.ProgressBar3)
        Me.Controls.Add(Me.ProgressBar2)
        Me.Controls.Add(Me.ProgressBar1)
        Me.Controls.Add(Me.Label4)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "进度条"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private temp As Int32
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim i, j, k, l As Int16
        temp = 0
        For i = 0 To 20
            ProgressBar1.Value = i
            Label1.Text = i
            For j = 0 To 20
                ProgressBar2.Value = j
                Label2.Text = j
                For k = 0 To 20
                    ProgressBar3.Value = k
                    Label3.Text = k
                    For l = 0 To 20
                        ProgressBar4.Value = l
                        Label4.Text = l
                        Me.Refresh()
                        temp = temp + 1
                    Next
                Next
            Next
        Next
    End Sub
End Class