如何在VB.NET 中限制文本框中只能输入数字

以下是只能输入数字和小数点，并且小数点只能输入一次

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Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Textbox1.KeyPress

If Char.IsDigit(e.KeyChar) or e.KeyChar = Chr(8) or e.KeyChar = "." Then

If e.KeyChar = "." And InStr(TextBox1.Text, ".") 0 Then

e.Handled = True

Else

e.Handled = False

End If

Else

e.Handled = True

End If

End Sub

VB.NET中怎么实现每单击一次按钮，文本框就多出现一个1-13的随机数字？

Dim n As Integer, b As Integer, a(13) As Integer

Private Sub Command1_Click()

If b 5 Then

b = b + 1

x = Int(n * Rnd()) + 1

Text1.Text = Text1.Text a(x) " "

a(x) = a(n)

n = n - 1

Else

Call Form_Load

End If

End Sub

Private Sub Form_Load()

Randomize

n = 13: b = 0

For i = 1 To 13

a(i) = i

Next i

Text1.Text = ""

End Sub

VB.NET ，文本框限制输入数字个数。例如不低于5位数而不大于11位数。违反则有提示。

input type="text" maxlength="11" /这是控制最大输入字数至于不能少于11个字，需要在点击保存按钮时，通过.length来控制

VB.NET中让Textbox只能输入数字

Public Class Form     Inherits System Windows Forms Form

#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

窗体重写 dispose 以清理组件列表     Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)        If disposing Then            If Not (ponents Is Nothing) Then                ponents Dispose()            End If        End If        MyBase Dispose(disposing)    End Sub

Windows 窗体设计器所必需的    Private ponents 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     Friend WithEvents TextBox As System Windows Forms TextBox    Private Sub InitializeComponent()        Me TextBox = New System Windows Forms TextBox        Me SuspendLayout()                TextBox                 Me TextBox Location = New System Drawing Point( )        Me TextBox Name = TextBox         Me TextBox TabIndex =         Me TextBox Text =                 Form                 Me AutoScaleBaseSize = New System Drawing Size( )        Me ClientSize = New System Drawing Size( )        Me Controls Add(Me TextBox )        Me Name = Form         Me Text = Form         Me ResumeLayout(False)

End Sub

#End Region    Dim str As String =

lishixinzhi/Article/program/net/201311/13841

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