如何将负数放到文本框中，如下图所示？ [英] How Can I Put The Negative Number To the Textbox like the picture below?

问题描述

http://i58.tinypic.com/25fndc6.jpg [ ^ ]

如何将负数更改为文本框？如图下面





这里我的代码!!

 Private Sub Button1_Click（ByVal sender As System.Object，ByVal e As System.EventArgs）处理Button1.Click 
 Dim i As Double = txtpayment.Text 
i  -  = txtname.Text 
 txtbalance.Text = + -i.ToString 
 
 
结束子
 

解决方案

嗯，我建议从不开始试图从一个数字中减去一个名字 - 它通常效果不好......



我还建议使用int.TryParse将文本框值转换为数字 - 如果用户键入非数字值，则显示错误报告。

  Dim  char ge 作为 整数 
 如果 不 整数 .TryParse（txtCharge.Text，charge）然后 
 ' 报告错误 
 ... 
 返回 
 结束 如果 
  Dim  payment 作为 整数 
 如果 不 整数 .TryParse （txtPayment.Text，付款）然后 
 ' 报告错误 
 ... 
 返回 
 结束 如果 
  Dim  balance < span class =code-keyword> As   Integer  = charge  -  payment 
 txtBalance.Text = balance.ToString（）

http://i58.tinypic.com/25fndc6.jpg[^]
how can i put the negative number to change textbox?like the picture below


here my code!!

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Dim i As Double = txtpayment.Text
       i -= txtname.Text
       txtbalance.Text = +-i.ToString


   End Sub

解决方案

Well, I would suggest starting by not trying to subtract a name from a number - it generally doesn't work too well...

I would also suggest using int.TryParse to convert the textbox values to numbers - with error reporting if the user types a non-numeric value.

Dim charge As Integer
If Not Integer.TryParse(txtCharge.Text, charge) Then
    ' Report error
    ...
    Return
End If
Dim payment As Integer
If Not Integer.TryParse(txtPayment.Text, payment) Then
    ' Report error
    ...
    Return
End If
Dim balance As Integer = charge - payment
txtBalance.Text = balance.ToString()

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