如何允许用户在 vb.net 的文本框中只输入数字? [英] How to allow user to enter only numbers in a textbox in vb.net?

问题描述

如何防止用户输入字符但只输入数字和."在 vb.net 2005 的文本框中?

How can I prevent the user to enter characters but only numbers and '.' in a textbox in vb.net 2005?

推荐答案

以下将允许您测试特定的键值(来自 http://www.daniweb.com/forums/thread127299.html):

The following will allow you to test for specific key values (from http://www.daniweb.com/forums/thread127299.html):

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
    If (Microsoft.VisualBasic.Asc(e.KeyChar) < 48) _
              Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 57) Then
            e.Handled = True
    End If
    If (Microsoft.VisualBasic.Asc(e.KeyChar) = 8) Then
            e.Handled = False
    End If
End Sub

如果这不是您要查找的内容，请尝试使用 isNumeric() 函数.

If this isn't what you are looking for, try the isNumeric() function.

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