MDI应用问题 [英] mdi application problem

问题描述

我正在创建MDI应用程序
因为我有一些孩子形式

我的缺点是:

我使用menuStrip打开子窗体
当我打开第一个子窗体(可能是任何窗体)时
之后，当我打开另一个子窗体时，应该自动关闭我打开的第一个子窗体.

I am creating mdi application
in that i have some child form

my broblem is :

I open child form using menuStrip
when i open first child form(may be any form)
afterthat when i open another child form, first child form i had opened should be automatically closed.

推荐答案

为此，您需要做两件事:
1)在您的MDI父类中保留打开每种表单类型的实例的引用.我可能会将其作为实际形式的一个实例:

To do this, you need to do two things:
1) Keep a reference in your MDI parent class of what instances of each form type are open. I would probably make it an instance of the actual form:

private MyMDIChild current = null;
...
if (current != null)
   {
   current.Close();
   }
current = new MyMDIChild();
current.Show();

2)在显示子窗体FormClosing事件之前，将一个处理程序附加到该子窗体的FormClosing事件上，并在处理程序中将"current"返回为null.

2) Attach a handler to the child forms FormClosing event before you show it, and return "current" to null in the handler.

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