使用自定义的控件,继承一个textbox 下面是全部代码
Public Class NumericTextbox
Inherits System.Windows.Forms.TextBox#Region " Windows Form Designer generated code " Public Sub New()
MyBase.New() 'This call is required by the Windows Form Designer.
InitializeComponent() 'Add any initialization after the InitializeComponent() call End Sub 'UserControl1 overrides dispose to clean up the component list.
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 'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer 'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
components = New System.ComponentModel.Container
End Sub#End Region
Private Sub NumericTextbox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress
Dim KeyAscii As Integer
KeyAscii = Asc(e.KeyChar) Select Case KeyAscii
Case 48 To 57, 8, 13
Case 45
If Me.SelectionStart <> 0 Then
KeyAscii = 0
End If
Case 56
If InStr(Me.Text, ".") <> 0 Then
KeyAscii = 0
End If Case Else
KeyAscii = 0
End Select If KeyAscii = 0 Then
e.Handled = True
Else
e.Handled = False
End If
End Sub
End Class
Public Class NumericTextbox
Inherits System.Windows.Forms.TextBox#Region " Windows Form Designer generated code " Public Sub New()
MyBase.New() 'This call is required by the Windows Form Designer.
InitializeComponent() 'Add any initialization after the InitializeComponent() call End Sub 'UserControl1 overrides dispose to clean up the component list.
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 'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer 'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
components = New System.ComponentModel.Container
End Sub#End Region
Private Sub NumericTextbox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress
Dim KeyAscii As Integer
KeyAscii = Asc(e.KeyChar) Select Case KeyAscii
Case 48 To 57, 8, 13
Case 45
If Me.SelectionStart <> 0 Then
KeyAscii = 0
End If
Case 56
If InStr(Me.Text, ".") <> 0 Then
KeyAscii = 0
End If Case Else
KeyAscii = 0
End Select If KeyAscii = 0 Then
e.Handled = True
Else
e.Handled = False
End If
End Sub
End Class
{
if (//判断无效键盘值) e.handler = true; //取消按键
}
{
e.Handled = !char.IsDigit(e.KeyChar);
}
if(char.isnumber(e.keychar)==true || e.char==".")
是数字
{
if(!(System.Text.RegularExpressions.Regex.IsMatch(e.KeyChar.ToString(),
@"^(-?\d+)(\.\d+)?$") || e.KeyChar == Convert.ToChar(8) || e.KeyChar == '.'))
{
e.Handled=true;
}
base.OnKeyPress (e);
}