如何在最后一个数字上加1? [英] How to add 1 to last number?

问题描述

我使用标签作为订单号.我希望每次下订单时给订单号加 1.我需要做一个循环吗?如果是这样，如何?

i use label for a order number.i want it add 1 to order number each time the order is placed. do i need do a loop ? And if so, how?

Private Sub btnprint_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnprint.Click
    'ordernumber = 0

    ordernumber = ordernumber + 1
    Lblorn.Text = ("Order Number:" & ordernumber)

推荐答案

在这种情况下您不需要循环，因为只有在触发 btnprint_Click 事件时才会增加订单号.

You don't need a loop in this case as incrementing the order number should happen only when the btnprint_Click event is triggered.

如果您想在事件触发后继续打印 n 编号或订单，则需要循环.

A loop is required if you want to keep printing an n number or orders once the event is triggered.

您需要声明一个变量，该变量对于存在此按钮和标签的窗体/窗口是全局的，并且将在内存中保留最新的 ordernumber - 仅在窗口打开之前.关闭应用程序后，再次打开它 - 它将默认为 0.

You need to declare a variable which is global to the form/window where this button and the label is present and that will keep the latest ordernumber in memory - only till the window is open. Once you close the application, and open it again - it will be defaulted to 0.

如果您希望这个最新的 ordernumber 在应用程序的其他部分可用，则需要在应用程序级别将 ordernumber 声明为全局变量.

If you want this latest ordernumber available in other parts of the application, you need to declare the ordernumber as a global variable, in the application level.

如果您想存储最新的ordernumber 的值，即使在应用程序关闭或之后，您也需要将其存储在数据库或文件中，并在应用程序再次加载时检索它.

If you want to store the value of latest ordernumber, even after the application is closed or after , you need to store it in a database or file and retrieve it while the application is loaded again.

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