通过继承TextBox,添加了一个ValidText属性,用来获取和设置有效的文本输入
还有一个EditAble属性,决定文本框是否支持退格编辑。
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Public Class MyTextBox
Inherits System.Windows.Forms.TextBox
Private m_strValidText As String = "0123456789.+-" & Chr(13).ToString
Private m_blnEditable As Boolean = True
#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
'UserControl1 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。
1<system.diagnostics.debuggerstepthrough()> Private Sub InitializeComponent()
2components = New System.ComponentModel.Container
3End Sub
4
5#End Region
6
7Private Sub MyTextBox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress
8Dim strLocalString As String
9If EditAble Then
10strLocalString = m_strValidText & Chr(8).ToString
11Else
12strLocalString = m_strValidText
13End If
14If UCase(strLocalString).IndexOf(UCase(e.KeyChar)) < 0 Then
15e.Handled = True
16Beep()
17Else
18
19End If
20End Sub
21Public Property ValidText() As String
22Get
23Return m_strValidText
24End Get
25Set(ByVal Value As String)
26m_strValidText = Value
27End Set
28End Property
29Public Property EditAble() As Boolean
30Get
31Return m_blnEditable
32End Get
33Set(ByVal Value As Boolean)
34m_blnEditable = Value
35End Set
36End Property
37End Class</system.diagnostics.debuggerstepthrough()>