错误在MDI容器C＃Windows应用程序内的最大化模式下的最大化子窗体上打开子窗体时 [英] Error While a Child form is opened on a Maximized Child Form in Maximized Mode inside a MDI Container C# Windows Application

问题描述

大家好，



我在这里遇到一个特殊问题我的菜单表格是这里的MDI容器我在最大化模式下打开一个表单并在那个表单上按一下打开另一个最大化的形式，但在这里我得到一个错误抛出作为对象参考没有设置和它带我到一个Dilogue什么可能是问题我在这里粘贴我如何调用新表格。



Form frm = new Form（）;

frm.MdiParent = MdiParent;

this.Close（）;

frm .Show（）;

frm.WindowState = FormWindowState.Normal;

frm.WindowState = FormWindowState.Maximized;



谢谢和问候

Madhukumar N

解决方案

这是个主意：谁需要MDI，永远？为什么要折磨自己并吓跑你的用户？

帮自己一个大忙：根本不要使用MDI。没有它，您可以更轻松地实现设计，质量更好。 MDI甚至被微软高度劝阻，事实上，微软将其从WPF中删除并且很难支持它。更重要的是，如果您使用MDI，您将吓跑所有用户。只是不要。请参阅：

http://en.wikipedia.org/wiki/Multiple_document_interface#Disadvantages [ ^ ]，

如何在WPF中创建MDI父窗口？ [ ^ ]。



我可以解释做什么。请看我过去的答案：

如何在WPF中创建MDI父窗口？ [解决方案2 ]，

关于在WPF中使用MDI窗口的问题 [ ^ ]，

麦当劳给出错误 [ ^ ]，

如何设置子窗体最大化，最后一个子窗体最小化 [ ^ ]。

-SA

Hi Everyone,

Im Getting a Peculiar Problem here My Menu Form is the MDI Container here Im Opening a Form in Maximized Mode and on That Form a Button Click has Open another Maximized form but here im Getting a Error Thrown as Object Reference not set and its Taking me to a Dilogue What May Be the Issue Im Pasting here how im Calling the New Form.

Form frm = new Form();
frm.MdiParent = MdiParent;
this.Close();
frm.Show();
frm.WindowState = FormWindowState.Normal;
frm.WindowState = FormWindowState.Maximized;

Thanks and Regards
Madhukumar N

解决方案

Here is the idea: who needs MDI, ever? Why torturing yourself and scaring off your users?
Do yourself a great favor: do not use MDI at all. You can do much easier to implement design without it, with much better quality. MDI is highly discouraged even by Microsoft, in fact, Microsoft dropped it out of WPF and will hardly support it. More importantly, you will scare off all your users if you use MDI. Just don''t. Please see:
http://en.wikipedia.org/wiki/Multiple_document_interface#Disadvantages[^],
How to Create MDI Parent Window in WPF?[^].

I can explain what to do instead. Please see my past answers:
How to Create MDI Parent Window in WPF? [Solution 2],
Question on using MDI windows in WPF[^],
MDIContainer giving error[^],
How to set child forms maximized, last childform minimized[^].

—SA

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