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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
      當前位置:
      首頁 > 編程開發 > .net教程 >
      • vb.net教程之文本框與數據校驗

      • 2015-01-17 22:45 來源:未知
      文本框與數據校驗
      即與文本框相關的事件。
      練習:試做一個字處理軟件,包括如下功能:輸入內容;打開、保存文件;編輯功能(復制、剪切、粘貼);文字格式設置(字體、字號、字形、字的顏色)。
      6.5復選框、單選按鈕(相關vb.net教程)
      復選框:可以多選與不選,靈活。
      單選按鈕:選且只能選擇一個。
      習慣通過groupbox控件結合成一組。
      Checkbox: 復選框
      常用屬性
      Checked:復選框是否被選擇.
      Appearance:外觀樣式,normal—常規外觀,button—按鈕外觀
      Flatstyle:外觀風格,有四個.
      常用事件:click—單擊、CheckedChanged—選擇變化激發的。
      Radiobutton: 單選按鈕
      Groupbox: 控件組,用以組織控件成為一組.
      應用:
      例4:在文本框中輸入文字,然后用單選鈕控制字的顏色、字型(文字加粗、傾斜、下畫線)字號(10、20、40)。[實驗報告21 ]
      見字體字號字形字的顏色.
      注意:字的顏色可以在程序直接設置屬性實現,但字號,字型則不能直接在程序中設置?(因為它們都是只讀屬性,只能在屬性窗口中設置,而不能在程序中引用)
      程序為:
        Private Sub setfont()
              Dim s As FontStyle = FontStyle.Regular
              If CheckBox1.Checked Then s = s + FontStyle.Bold
              If CheckBox2.Checked Then s = s + FontStyle.Italic
              If CheckBox3.Checked Then s = s + FontStyle.Underline
              TextBox1.Font = New Font(TextBox1.Font.Name, TextBox1.Font.Size, s)
          End Sub
          Private Sub setsize()
              If RadioButton1.Checked Then TextBox1.Font = New Font(TextBox1.Font.Name, 10)
              If RadioButton2.Checked Then TextBox1.Font = New Font(TextBox1.Font.Name, 20)
              If RadioButton3.Checked Then TextBox1.Font = New Font(TextBox1.Font.Name, 40)
          End Sub
       
          Private Sub RadioButton1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged
              setsize()
          End Sub
       
          Private Sub RadioButton6_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton6.CheckedChanged
              TextBox1.ForeColor = Color.Black
          End Sub
       
          Private Sub RadioButton5_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton5.CheckedChanged
              TextBox1.ForeColor = Color.Red
          End Sub
       
          Private Sub RadioButton4_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton4.CheckedChanged
              TextBox1.ForeColor = Color.Blue
          End Sub
       
          Private Sub RadioButton2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton2.CheckedChanged
              setsize()
          End Sub
       
          Private Sub RadioButton3_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton3.CheckedChanged
              setsize()
          End Sub
       
          Private Sub CheckBox1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckBox1.Click
              setfont()
          End Sub
       
          Private Sub CheckBox2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckBox2.Click
              setfont()
          End Sub
       
          Private Sub CheckBox3_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckBox3.Click
              setfont()
          End Sub
       
          Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
              End
          End Sub
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