仅允许文本框中的数值？

Question

我需要在文本框中控制用户的输入，那么我该怎么做？ 谢谢

Answer 1

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If Asc(e.KeyChar) <> 13 AndAlso Asc(e.KeyChar) <> 8 AndAlso Not IsNumeric(e.KeyChar) Then
            MessageBox.Show("Please enter numbers only")
            e.Handled = True
        End If
    End Sub

已经问过同样的问题

How to allow user to enter only numbers in a textbox in vb.net?

Enter numeric value only into textbox in visual basic

Answer 2

If Asc(e.KeyChar) <> 8 Then
        If Asc(e.KeyChar) < 48 Or Asc(e.KeyChar) > 57 Then
            e.Handled = True
        End If
End If