blocks|key|4107283|text|在调用panel1.Controls.Clear()之前使用此循环，并确保用户控件中的Dispose()方法依次释放所有可释放的资源。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4107284|foreach+(Control+control+in+panel1.Controls)
{
+++control.Dispose();
}|code-block|syntax|javascript|4107285|entityMap^0|3|N|17|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

Use this loop before calling <code>panel1.Controls.Clear()</code> and be sure that the <code>Dispose()</code> method in the user controls are in turn disposing of any disposable resources.

<pre><code>foreach (Control control in panel1.Controls)
{
 control.Dispose();
}
</code></pre>

blocks|key|2685021|text|我用动态内容做了足够多的工作，所以我已经将这个方法添加到了我的基页类中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2685022|///+<summary>
///+Dispose+a+control+and+all+its+children
///+</summary>
public+void+DisposeControl(Control+c)
{
++++if+(null+!=+c)
++++++++using+(c)
++++++++++++DisposeChildControlsOf(c);
}

///+<summary>
///+Dispose+(and+remove)+all+the+children+of+a+control
///+</summary>
public+void+DisposeChildControlsOf(Control+c)
{
++++if+(null+!=+c)
++++++++if+(null+!=+c.Controls)
++++++++++++while+(c.Controls.Count+>+0)
++++++++++++{
++++++++++++++++Control+child+=+c.Controls[0];
++++++++++++++++c.Controls.RemoveAt(0);
++++++++++++++++DisposeControl(child);
++++++++++++}
}|code-block|syntax|javascript|2685023|它也是递归的。然后这样叫它(如果你自己不拥有这个控件)：|2685024|DisposeChildControlsOf(panel1);|2685025|或|2685026|DisposeControl(myDynamicallyGeneratedControl);|2685027|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I do this enough with dynamic content that i have added this method to my base-page class:

<pre><code>/// &lt;summary&gt;
/// Dispose a control and all its children
/// &lt;/summary&gt;
public void DisposeControl(Control c)
{
 if (null != c)
 using (c)
 DisposeChildControlsOf(c);
}

/// &lt;summary&gt;
/// Dispose (and remove) all the children of a control
/// &lt;/summary&gt;
public void DisposeChildControlsOf(Control c)
{
 if (null != c)
 if (null != c.Controls)
 while (c.Controls.Count &gt; 0)
 {
 Control child = c.Controls[0];
 c.Controls.RemoveAt(0);
 DisposeControl(child);
 }
}
</code></pre>

It's recursive too. And then call it like so (if you don't own the control yourself):

<pre><code>DisposeChildControlsOf(panel1);
</code></pre>

or

<pre><code>DisposeControl(myDynamicallyGeneratedControl);
</code></pre>

blocks|key|1847959|text|for+each循环不会完成这项工作。因为在每次处理之后，元素和索引都会发生变化。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1847960|你每次都需要一个while循环来处理最顶层的控件。|1847961|在我使用的以下代码中，我有一个带有用户控件的面板。我进入第一个控件并释放它的控件，然后释放控件本身。|1847962|处理完所有控件后，触发清除以重置索引。|1847963|While+pnlMain.Controls.Count+>+0

++++While+pnlMain.Controls(0).Controls.Count+>+0
++++++++pnlMain.Controls(0).Controls(0).Dispose()
++++End+While

++++pnlMain.Controls(0).Dispose()
End+While
pnlMain.Controls.Clear()|code-block|syntax|javascript|1847964|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|R|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

A for each loop will not do the job. Since after each dispose the elements and indexes are changed.

You need a while loop disposing the top most control each time.

In the following code that I use, I have a panel with user controls in it.
I go into the first control and dispose of its controls then dispose of the control itself.

After disposing of all the controls trigger a clear to reset the index.

<pre><code>While pnlMain.Controls.Count &gt; 0

 While pnlMain.Controls(0).Controls.Count &gt; 0
 pnlMain.Controls(0).Controls(0).Dispose()
 End While

 pnlMain.Controls(0).Dispose()
End While
pnlMain.Controls.Clear()
</code></pre>

I have a Windows Form screen with a menu bar docked at the left-hand side on the form, similar to the one of Outlook 2003, and a panel taking the rest of the right-hand side of the form.

My left menu contains items.
Upon clicking on those items, I want to load the appropriate user control (acting as "sub-forms") on the right-hand side panel.
I have managed to do that and it is working well.

The worry I have though is whether or not my usercontrols are being disposed properly or if they remain on memory when the user clicks another menu item (and as such, loads another usercontrol/subform).

The code is similar to this:

<pre><code> private void ultraExplorerBar1_ItemClick(object sender, Infragistics.Win.UltraWinExplorerBar.ItemEventArgs e)
 {
 panel1.Controls.Clear();

 if (e.Item.Key == "Action")
 {
 ActionUserControl subForm = new ActionUserControl();
 panel1.Controls.Add(subForm);
 subForm.Show(); 
 }
 else if (e.Item.Key == "Options")
 {
 OptionsUserControl subForm = new OptionsUserControl();
 panel1.Controls.Add(subForm);
 subForm.Show();
 }
 }
</code></pre>

I am not sure if the panel1.Controls.Clear() I'm calling at the beginning of the method is enough for the usercontrols not being used anymore to be garbage-collected in due-time?

To my understanding, there shouldn't be any reference left to it in the application once cleared from the panel but I am not sure if I should be doing something else or of a reasonably lightweight tool I could use to confirm that my subforms are disposed as they should and that it doesn't cause some kind of memory/resources leak?

Properly disposing/closing an user control

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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