将面板复制到在运行时创建的另一个面板 [英] copy a panel into another panel created at runtime

问题描述

嘿，

我试图将一个面板复制到在运行时创建的另一个面板，但是旧面板不断消失，您能告诉我什么地方出问题吗?

我的代码:

Hey,

I'' trying to copy one panel into another panel which is created at run time but the old panel keeps disappearing , can you tell me what''s wrong ?

my code :

Friend withevent NewPanel As New Panel
Me.Controls.Add(NewPanel)
NewPanel = Panel1
NewPanel.Top=Panel1.Top + Panel1.Height 

推荐答案

您并没有真正创建新的面板.

您正在做的是为名为NewPanel
的面板创建一个新的指针
是的，有一秒钟，您正在创建一个新的面板并将其分配给指针.但是随后您立即将新面板的指针更改为指向旧面板的指针.

所以NewPanel == Panel1

这不是创建副本.诸如Panel之类的对象存在于内存的Stack区域中.

这意味着NewPanel = Panel1不会创建副本.它只是更改NewPanel，所以它指向与Panel1相同的内存位置. NewPanel和Panel1是相同的Panel实例.

要创建面板的副本，您将必须创建一个新面板，然后使用您的代码对其进行配置.因此，您将拥有与NewPanel = Panel1相似的东西:

You''re not really creating a new panel.

What you''re doing is creating a new pointer for a Panel called NewPanel

And yes, for a second you''re creating a new Panel and assigning it to the pointer. But then you immediately change the pointer for the new panel to point to the old one.

So NewPanel == Panel1

This isn''t creating a copy. Objects such as Panels exist in the Stack area of memory.

This mean that NewPanel = Panel1 isn''t creating a copy. It''s just changing NewPanel so it points to the same memory location as Panel1. NewPanel and Panel1 are the same Panel instance.

To create a copy of the panel you''ll have to create a new panel and then configure it using your code. So instead of NewPanel = Panel1 you''d have something similar to this:

NewPanel.Left = Panel1.Left
NewPanel.Top = Panel1.Top

添加与配置旧面板一样需要配置新面板的所有属性.

然后，您需要对面板中的所有控件执行类似的操作.

实话实说，这是很多艰苦的工作.我将创建一个自定义控件，其中包含一个面板以及该面板中包含的所有控件.然后，您只需要创建自定义控件的新实例.

以下是开发自定义控件的介绍.

http://msdn.microsoft.com/en-us/library/6hws6h2t.aspx [ ^ ]

Adding all the properties you need to configure the new panel as the old one was.

You then need to do a similar thing for the all the controls within the panel.

Truth be told, that''s a lot of hard work. I''d create a custom control which contains a Panel and all the controls contained within the Panel. Then you need only create a new instance of your custom control.

The following is an introduction to developing custom controls.

http://msdn.microsoft.com/en-us/library/6hws6h2t.aspx[^]

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