VB.NET ProgressBar.PerformStep方法代碼示例

Private Sub CopyWithProgress(ByVal ParamArray filenames As String())
    ' Display the ProgressBar control.
    pBar1.Visible = True
    ' Set Minimum to 1 to represent the first file being copied.
    pBar1.Minimum = 1
    ' Set Maximum to the total number of files to copy.
    pBar1.Maximum = filenames.Length
    ' Set the initial value of the ProgressBar.
    pBar1.Value = 1
    ' Set the Step property to a value of 1 to represent each file being copied.
    pBar1.Step = 1

    ' Loop through all files to copy.
    Dim x As Integer
    for x = 1 To filenames.Length - 1
        ' Copy the file and increment the ProgressBar if successful.
        If CopyFile(filenames(x - 1)) = True Then
            ' Perform the increment on the ProgressBar.
            pBar1.PerformStep()
        End If
    Next x
End Sub

' 導入命名空間
Imports System
Imports System.Data
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Diagnostics
Imports System.Drawing.Printing

Public Class MainClass
    
    Shared Sub Main()
        
       Dim form1 As Form = New Form1
       Application.Run(form1) 
    End Sub
End Class


Public Class Form1
    Private Sub btnGo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGo.Click
        ProgressBar1.Step = 21
        ProgressBar1.Value = 0
        btnGo.Enabled = False
        Timer1.Enabled = True
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        ProgressBar1.PerformStep()
        If ProgressBar1.Value >= ProgressBar1.Maximum Then
            Timer1.Enabled = False
            btnGo.Enabled = True
        End If
    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.components = New System.ComponentModel.Container
        Me.ProgressBar1 = New System.Windows.Forms.ProgressBar
        Me.btnGo = New System.Windows.Forms.Button
        Me.Timer1 = New System.Windows.Forms.Timer(Me.components)
        Me.SuspendLayout()
        '
        'ProgressBar1
        '
        Me.ProgressBar1.Location = New System.Drawing.Point(16, 48)
        Me.ProgressBar1.Name = "ProgressBar1"
        Me.ProgressBar1.Size = New System.Drawing.Size(248, 16)
        Me.ProgressBar1.TabIndex = 3
        '
        'btnGo
        '
        Me.btnGo.Location = New System.Drawing.Point(16, 16)
        Me.btnGo.Name = "btnGo"
        Me.btnGo.Size = New System.Drawing.Size(48, 24)
        Me.btnGo.TabIndex = 2
        Me.btnGo.Text = "Go"
        '
        'Timer1
        '
        Me.Timer1.Interval = 250
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(282, 86)
        Me.Controls.Add(Me.ProgressBar1)
        Me.Controls.Add(Me.btnGo)
        Me.Name = "Form1"
        Me.Text = "UseProgressBar"
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents ProgressBar1 As System.Windows.Forms.ProgressBar
    Friend WithEvents btnGo As System.Windows.Forms.Button
    Friend WithEvents Timer1 As System.Windows.Forms.Timer

End Class