Textbox Max Min值 [英] Textbox Max Min value

问题描述

首先我要说这是一个有点愚蠢的问题。



有没有办法可以设置 max （246）和 min （0）文本框的值？



我知道我可以做...

Let me start off by saying this is a kinda dumb question.

Is there a way you can set the max (246) and min (0) value of a textbox?

I know I could do …

If DataSizeText.Text < 0 Then
    DataSizeText.Text = 0
ElseIf DataSizeText.Text > 246 Then
    IndexText.Text = 246
    DataSizeText.Text = 246 
End if 

您还有什么方法可以设置最大值和最小值？比如可能使用属性工具栏？

What other way could you go about setting max and min value? Like maybe use the properties tool bar ?

推荐答案

没有。 Text属性是一个字符串，而不是整数，所以max和min对它没有任何意义。



相反，请考虑使用NumericUpDown代替。

No. The Text Property is a string, not an integer, so "max" and "min" don't mean anything to it.

Instead, consider using a NumericUpDown instead.

您没有使用 WinForm 或 ASP.NET



如果你想在中使用Windows Forms 应用程序

那么 NumericUpDown 可以使用控件，可以设置最小和最大属性达到所需的价值。分别为0,246。

这里给出一个例子

http://msdn.microsoft.com/en-us/library/system.windows.forms.numericupdown.minimum.aspx [ ^ ]



如果你想在中使用ASP.NET 应用程序

那么 TextBox 控制以及 RangeValidator 控件可以使用。

RangeValidator 在这里解释

http://www.w3schools.com/aspnet/control_rangevalidator.asp [ ^ ]

它可以在线测试

http://www.w3schools.com/aspnet/showasp.asp?filename=demo_rangevalidator2 [ ^ ]

和

http://www.w3schools.com/aspnet/showasp.asp?filename=demo_rangevalidator [ ^ ]

You have not tagged your question either with WinForm or ASP.NET

If you want to use in Windows Forms application
Then NumericUpDown control can be used and Minimum and Maximum properties can be set to the values required. i.e. 0, 246 respectively.
An example is given here
http://msdn.microsoft.com/en-us/library/system.windows.forms.numericupdown.minimum.aspx[^]

If you want to use in ASP.NET application
Then TextBox control along with RangeValidator control can be used.
The RangeValidator is explained here
http://www.w3schools.com/aspnet/control_rangevalidator.asp[^]
It can be tested online at
http://www.w3schools.com/aspnet/showasp.asp?filename=demo_rangevalidator2[^]
and
http://www.w3schools.com/aspnet/showasp.asp?filename=demo_rangevalidator[^]

我试过这个简单的代码但是如何为表单中的所有文本框设置这个？

I tried this simple code but how to set this for all textboxes in the form?

Private Sub textBox1_KeyPress(sender As Object, e As KeyPressEventArgs)
    If e.KeyChar <> ControlChars.Back AndAlso e.KeyChar <> "-"C Then
        'allow backspace for deleting and minus simbol
        e.Handled = Not Char.IsNumber(e.KeyChar)
        'allow numbers only
        If Not e.Handled Then
            Dim num As Integer = Integer.Parse(String.Format("{0}{1}", If(textBox1.Text = String.Empty, "", textBox1.Text), e.KeyChar.ToString()))
            If  num > 11 Then
                e.Handled = True
            End If
        End If
    End If
End Sub

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