更新到文本框中的下一个值，因为它用于发票系统 [英] to update to next value in textbox as it is used for invoice system

问题描述

先生，我想自动增加textbox2.text的价值，因为它用于发票编号.我想从1000开始增加，请帮助我如何增加.

谢谢inadvance，我是软件开发的新手，我衷心希望对会员的帮助不大，祝我2012年新年快乐.

sir i wanted to auto increment the textbox2.text as it is used for invoice no. i wanted to increment from 1000 and please help me how can i increment.

Thanks inadvance and i am new to software developing i hope little help from members n my heartly wishes to Very happy new year 2012.

推荐答案

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尽管可以，我不会这么做.

以这种方式执行操作取决于用户不修改值并插入非数字值.

最简单的方法是将当前发票号保留为类级别的整数变量，并在必要时将其递增，然后重新编写文本框的内容.

Although you can, I wouldn''t do it.

Doing it that way relies on the user not modifying the value and inserting a non-numeric value.

The easiest way is to keep the current invoice number as a class level integer variable, and increment it when necessary and re-write the contents of the text box.

private int invoiceNumber = 1000;
...
private void NextInvoice()
   {
   invoiceNumber++;
   TextBoxForInvoiceNumber.Text = invoiceNumber.ToString("000000");
   }

但是我会使用Label而不是TextBox，或者将TextBox ReadOnly属性设置为true.

如果必须使用TextBox内容，则必须执行以下操作:

But I would use either a Label instead of a TextBox, or make the TextBox ReadOnly property true.

If you must use the TextBox content, you have to do:

private void NextInvoice()
   {
   int invoiceNumber = int.Parse(TextBoxForInvoiceNumber.Text);
   invoiceNumber++;
   TextBoxForInvoiceNumber.Text = invoiceNumber.ToString("000000");
   }

并请记住添加错误陷阱等，以防止用户犯小错误时您的应用崩溃...

And remember to add error trapping and so forth to prevent your app falling over when the user makes a small mistake...

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