VB.NET文本框的操作方式多样化,应用起来也比较简单,开发人员可以根据不同的需求任意选择一种方法来帮助自己实现所需要的功能。那么今天介绍的VB.NET文本框的操作方法,则是针对中文输入的限制等。
下面是VB.NET文本框操作的相关代码:
- 'sunnyxing2004-04-01***修改
- 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。
- <System.Diagnostics.DebuggerStepThrough()>
Private Sub InitializeComponent()- components = New System.ComponentModel.Container
- End Sub
- #End Region
- Private Sub MyTextBox_KeyPress(ByVal sender As Object,
ByVal e As System.Windows.Forms.KeyPressEventArgs)
Handles MyBase.KeyPress- Dim strLocalString As String
- If EditAble Then
- strLocalString = m_strValidText & Chr(8).ToString
- Else
- strLocalString = m_strValidText
- End If
- If UCase(strLocalString).IndexOf(UCase(e.KeyChar)) < 0 Then
- e.Handled = True
- Beep()
- Else
- End If
- End Sub
- Public Property ValidText() As String
- Get
- Return m_strValidText
- End Get
- Set(ByVal Value As String)
- m_strValidText = Value
- End Set
- End Property
- Public Property EditAble() As Boolean
- Get
- Return m_blnEditable
- End Get
- Set(ByVal Value As Boolean)
- m_blnEditable = Value
- End Set
- End Property
- Public Sub CheckText(ByVal sender As Object, ByVal e
As System.EventArgs) Handles MyBase.TextChanged- Dim cha As Char
- Try
- cha = CType(Me.Text.Substring(Me.SelectionStart - 1, 1), Char)
- If m_strValidText.IndexOf(cha) < 0 Then
- MeMe.Text = Me.Text.Remove(Me.SelectionStart - 1, 1)
- End If
- Catch ex As Exception
- End Try
- End Sub
- End Class
VB.NET文本框中限制中文输入的方法就为大家介绍到这里。
【编辑推荐】