什么时候需要手动处理的控制？我怎么知道，如果一个控制实现IDisposable？ [英] When should I manually dispose of controls? How do I know if a control implements IDisposable?

问题描述

在约摆脱了旧的NotifyIcon有人告诉我，我应该释放任何实现IDisposable系统托盘中的previous问题。然而，听起来很好的做法，我为它提出了更多的问题:-)

In a previous question about ridding the system tray of an old NotifyIcon I was told that I should Dispose anything that implements IDisposable. Sounds like good practise to me however as a newbie it raises more questions :-)

我怎么知道，如果一个控制实现IDisposable？

How do I know if a control implements IDisposable?

我应该构建一个试图处理一切我所有的形式在formclosed事件类？

Should I build a class that attempts to dispose everything on all my forms in the formclosed event?

是这样的（伪code）：

Something like this?(psuedocode):

foreach(control cont in form)  
{  
try{cont.Dispose()}  
catch{}  
}

如果没有，那我怎么知道什么控制，我需要手动处理，还是应该在测试过程中我根本看不正常的行为呢？

If not, then how do I know what controls I would need to manually dispose, or should I simply watch for unusual behaviour during testing?

摹

编辑：所以，当我点击大红色的X上我的孩子形式，也不会导致其处置？是对的吗？这究竟是什么原因呢？

So when I click the big red "X" on my child form, that doesn't cause it to Dispose? is that right? What is the reason for this?

推荐答案

这是由形式拥有任何控制，处置时的形式布置的。换句话说，调用Dispose（）时，控制会调用Dispose（），其所有的孩子。需要注意的是隐藏的表单不会调用Dispose（），但在大多数情况下，它的罚款只是创建一个对话框，并根据需要进行处理。

Any control that is owned by the form is disposed of when the form is disposed of. In other words, when calling Dispose(), a control will call Dispose() on all of its children. Note that hiding a form will not call Dispose(), but in most cases it's fine to just create a dialog and dispose of it as needed.

这始终是设计器生成的窗体和控件的情况。如果你创建类似的NotifyIcon在code非可视组件（不设置所有者），您必须手动处理它。但它通常更容易正确地设置所有者。

This is always the case for designer-generated forms and controls. If you create a non-visual component like NotifyIcon in code (without setting the owner), you have to manually dispose of it. But it's usually easier to set the owner properly.

任何类实现了IDisposable应该调用Dispose（）就其孩子的，不管在集合或属性，除非有一个很好的理由不（即在某些情况下，主叫方可能会多留一个对象的所有者 - 但这也正是说明了将所有权是）的概念。

Any class implementing IDisposable should call Dispose() on its childs, no matter if in a collection or in a property, unless there's a good reason not to (i.e. in some cases the caller might stay the owner of an object - but that's exactly where the concept of setting the ownership is for).

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