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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
      SQL Server 2008 視頻教程 c#入門經典教程 Visual Basic從門到精通視頻教程
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      首頁 > 編程開發 > .net教程 >
      • vb.net教程之progressbar 與scrollbar

      • 2015-01-17 22:47 來源:未知
       progressbar 與scrollbar
      一、進度條控件:progressbar(相關vb.net教程)
      作用:用于軟件安裝或文件復制時的進度顯示。
      常用屬性:
      Minimam:進度表的最小值。
      Maximam: 進度表的最大值。
      Value:進度的當前值。
      應用實例:制作一個進度表,顯示完成進度的百分比與進度條,當到100%時彈出一個對話框,然后退出進度。[實驗報告 22]
      屬性設置:Minimam=0 Maximam=100value每次遞進1%
      見,進度條控件progressbar
      程序為:
      Public Class Form1
          Dim a As Integer
          Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
              Dim x As String
              a = a + 1
              ProgressBar1.Value = a : TextBox1.Text = a & "%"
              If a = 100 Then
                  Timer1.Enabled = False
                 MsgBox("進度完成將退出!", 16, "注意!")
                  End
              End If
          End Sub
      說明:上面程序中,條件語句中的三個語句:
      Timer1.Enabled = False
                  x = MsgBox("進度完成將退出!", 16, "注意!")
              End
      第一個語句必須寫在最前面,否則進度要超過100,出現超出上界的錯誤提示。
      二、滾動條控件
      作用:通過條上滾動塊的移動來取值,常用以輸入。
      有兩個:水平滾動條—hscrollbar,垂直滾動條—vscrollbar
      一、常用屬性
      Largechange:單擊箭頭與滾動塊之間時滾動的幅度。
      Smallchange:單擊箭頭滾動幅度。
      MaximumMinimum:兩端的取值。
      Value:滾動塊處的取值。
      二、常用事件
      Scroll事件:滾動塊移動時觸發
      應用實例:試用三個滾動條調整顏色,顏色模板用圖片框的背景色。[實驗報告23 ]
      程序見:滾動條控制顏色
      屬性設置:
      分別把三個滾動條的屬性:
      Largechange=20Smallchange=5
      Maximum=255Minimum=0
      說明:程序中對顏色模板調顏色用的是vb.net中的函數Color.FromArgb(r, g, b),在VB60中對應的函數是RGBRGB
      程序清單為:
      Public Class Form1
          Dim r, g, b As Integer
          Private Sub HScrollBar1_Scroll
              r = HScrollBar1.Value
              TextBox1.Text = r
              PictureBox1.BackColor = Color.FromArgb(r, g, b)
          End Sub
          Private Sub HScrollBar2_Scroll
              g = HScrollBar2.Value
              TextBox2.Text = g
              PictureBox1.BackColor = Color.FromArgb(r, g, b)
          End Sub
          Private Sub HScrollBar3_Scroll
              b = HScrollBar3.Value
              TextBox3.Text = b
              PictureBox1.BackColor = Color.FromArgb(r, g, b)
          End Sub
       
          Private Sub Button1_Click
              End
          End Sub
      End Class
      Vb.net中的一些設置
      大部分都在工具→選項中。
      1、代碼窗口的字體、字號顏色設置:
      工具→選項→環境→字體和顏色
      2、使用debug時,調入輸出窗口:
      調試→窗口→輸出(即時窗口的調入也是一樣)
      3、當程序中有多個窗口時,設置第一啟動窗口的方法:
      項目→WindowsApplication1屬性→啟動窗體中選擇對應窗體。
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