C#:从单独的表单中关闭和打开两个表单 [英] C#: Close and Open two forms from a separate form

问题描述

我有3种形式.我该如何做，以使一种形式显示为.Show()，而另一种形式隐藏为.Hide()呢?又是另一种形式?

I have 3 forms. How can I make it so that one form is shown with .Show() and the other is hidden with .Hide() from a separate form?

这是我的代码的一部分

    private void buttonYes_Click(object sender, EventArgs e)
    {
        LoggedIn loggedinform = new LoggedIn();
        loggedinform.Hide(); // Hides another form that is in the background
        MainForm mainform = new MainForm();
        mainform.Show(); // Show first form
        this.Hide(); // Hides current form
    }

一个问题，LoggedIn表单不会隐藏自身.从它的外观来看，它跳过了它，只是去了mainform.Show();

One problem, the LoggedIn form does not hide itself. From the looks of it it skips it and just goes for the mainform.Show();

这是一个错误还是我需要做其他事情?

Is this a bug or do I need to do something else?

推荐答案

LoggedIn loggedinform = new LoggedIn()行将创建该登录窗口的新实例.例如，如果您打算一次在屏幕上显示5个登录"窗口，则这可能会很有用.我认为您想要做的就是检索对已经显示的登录窗口的引用，并将其隐藏；因此，避免创建一个新的.

The line LoggedIn loggedinform = new LoggedIn() is going to create a new instance of that login window. That might be useful if, say, you intended to show 5 "Login" windows onscreen all at once. I think what you want to do is retrieve a reference to the login window that is already showing, and hide that; so, avoid creating a new one.

在程序周围正确传递对现有对象的引用是一种结构性问题，在我早期的编程时代，我遇到了很多问题.一种快速，不干净且通常不推荐的方法是将这些单个对象(例如，您的登录窗口)的实例声明为static，以便可以在任何地方检索它们.但是，为了以最佳方式完全回答您的问题，也许您可​​以描述一下程序的结构(完整的代码不是必需的，一般来说，类之间的流程是没有必要的)

Properly passing references to existing objects around the program is kind of a structural problem, and one that I ran into quite a bit in my early programming days. The quick, unclean, and generally not-recommended way is to declare instances of those singular objects (like, maybe, your login window) as static, so they can be retrieved anywhere. However, to fully answer your question in the best way, maybe you could describe the structure of your program a bit more (full code isn't necessary, just generally-speaking, what the flow is between classes)

这篇关于C#:从单独的表单中关闭和打开两个表单的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！