如果其实例正在运行，请关闭Windows窗体 [英] Close the windows form if its instance is running

问题描述

如果实例正在运行，请关闭Windows窗体.

我有三种形式
1)普通Windows窗体(命名为主屏幕)
2)MDI表格(名为POS)
3)MDI表格(命名股票)

当我单击[主屏幕]上的按钮时

我通过按钮单击事件从[Main Screen]打开MDIPOS FORM.代码是:

Close the windows form if its instance is running.

I have three forms
1) Normal Windows Forms (Named Main Screen)
2) MDI form (Named POS)
3) MDI form (Named Stock)

When I click Button on [Main Screen]

I am opening a MDIPOS FORM from [Main Screen] by button click event. The code is:

MDIPOS pos=new MDIPOS();
pos.MdiParent = this;
pos.Activate();           
pos.Show();

在关闭表单时遇到问题.
当我关闭MDI Form或Main Screen Form
其中一个实例仍在运行.
我用过:

Getting Problem in Closing the form.
When I close the MDI Form or Main Screen Form
one its instance remain running.
I used :

frmMain.Dispose();  //or
frmMain.Close();

然后它的实例仍保持运行.
如果我仅使用一种形式，则它会完美关闭.

如何关闭另一个表单的实例.
因为要访问表单，我们需要创建该表单的新对象，并且销毁了该新对象，但是打开的上一个对象又如何呢?

希望我能很好地解释这个问题.

感谢您的最佳答复

谢谢您

Then also it instance remain running.
If I use only one form, it closes perfectly.

How to close the instance of another form.
because, to access a form, we need to create a new object of that form and that that new object is destroyed , but what about the previous one which was opened.

I hope I explain the problem nicely.

Appreciate your best reply

Thanking You

推荐答案

尝试一下，

在关闭按钮(或)关闭表单事件中使用它

Try it,

use this in your Close Button (or) Form Closing Event

foreach(Form f in this.MdiChildren)
{
f.Close();
}

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