我如何确保用户不会在Winform应用程序上两次登录 [英] how can i make sure a user does not log in twice on a winform application

问题描述

我正在为学生注册建立Windows窗体应用程序，学生可以用大头针进行计时，但是我需要一种方法来确保他们一天不计时两次.请<

解决方案

请问我该怎么做，当他们进来时，您必须在记录ID，日期和时间以及方向(输入/输出)?

计时时，检查其先前的输入是OUT或不存在.计时时，检查其先前的输入为IN或不存在.

Hi,
i am building a windows forms application for a school register where the student can clock in with a pin, but i need a way of making sure they do not clock in twice in a day. Please how do i go about this, thanks

解决方案

When they clock in you must be recording an ID, Date and Time, and direction (IN / OUT)?

When clocking in, check their previous entry was OUT or does not exist. When Clocking out, check their previous entry was IN or does not exist.

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