C#:ToolStripDropDown不处理/销毁句柄

本文介绍了C#:ToolStripDropDown不处理/销毁句柄的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用ToolStripDropDown来显示一个选择弹出窗口.

I'm using the ToolStripDropDown to show up an selectionpopup.

ToolStripDropDown包含一些带有正在运行的线程的自定义控件. 线程以OnHandleDestroyed事件结束，但是由于某些原因，ToolStripDropDown在关闭后没有处置/销毁它的句柄.

The ToolStripDropDown contains a few custom controls with running Threads. The Threads ends with the OnHandleDestroyed event, but for some reason the ToolStripDropDown doesn't dispose/destroy it's handle after closing.

在封闭事件上放置ToolStripDropDown给我一个例外，因为仍然有任何东西可以访问ToolStripDropDown.

Disposing the ToolStripDropDown on the closed-event gives me an exception because anything still accesses the ToolStripDropDown.

我怎么知道自定义控件是否仍在使用或不结束线程?

How do I know if the custom Control is still in use or not to end the thread?

自定义控件:

public class CControl : Control { Thread StyleThread; Object lockOBJ = new Object(); bool abortthread = false; public CControl() { this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true); this.SetStyle(ControlStyles.Selectable, false); StyleThread = new Thread(new ThreadStart(this.StyleDelegate)); } protected override void OnHandleCreated(EventArgs e) { base.OnHandleCreated(e); if(!StyleThread.IsAlive) StyleThread.Start(); } protected override void OnHandleDestroyed(EventArgs e) { base.OnHandleDestroyed(e); lock (lockOBJ) { abortthread = true; } if (StyleThread.IsAlive) { StyleThread.Join(100); } } ... }

ToolStripDropDown-Control:

ToolStripDropDown-Control:

public class AddPopUp : UserControl { /* ------------------------------------ This Control contains some CControls ------------------------------------ */ public void Show(Control control) { TSDD tsdd = new TSDD(this); Point screenpoint = control.PointToScreen(new Point(0, 0)); tsdd.Show(control,new Point(0, -tsdd.Height )); } class TSDD : ToolStripDropDown { private Control Control { get; set; } public TSDD(Control control) { this.Control = control; this.DropShadowEnabled = false; ToolStripControlHost ch = new ToolStripControlHost(control); this.Items.Add(ch); } protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified) { base.SetBoundsCore(x, y, Control.Size.Width + 16, Control.Size.Height + 18, specified); } protected override CreateParams CreateParams { get { CreateParams cp = base.CreateParams; unchecked { cp.Style |= (int)0x80000000; cp.Style |= 0x40000; } return cp; } } protected override void WndProc(ref Message m) { if (m.Msg == 0x84) { m.Result = (IntPtr)1; return; } base.WndProc(ref m); } } }

在进行了同样的测试之后，我无法处理toolstripdropdown. 作为一种解决方法，我只是在toolstripdropdown关闭时销毁了手柄.

After same more testing i wasn't able to dispose the toolstripdropdown. As a workaround i'm just destroying the handle on close of the toolstripdropdown.

protected override void OnClosed(ToolStripDropDownClosedEventArgs e) { base.OnClosed(e); this.DestroyHandle(); }

推荐答案

ToolStrips存在一个非常持久的错误(声称已修复，但我仍然有问题)，在该错误中，他们向SystemEvents.UserPreferenceChanged注册了一个事件处理程序，以便能够重新绘制如果用户在OS中更改全局样式设置.

ToolStrips have a very persistent bug (claimed to be fixed, but I still have problems) where they register an event handler to SystemEvents.UserPreferenceChanged to be able to repaint if the user changes global style settings in the OS.

我发现的唯一解决方法是，通过枚举SystemEvents.UserPreferenceChanged中的处理程序来删除附加的工具条，并在处置控件后将其删除.

The only workaround I have found is to remove the attached toolstrips by enumerating the handlers in the SystemEvents.UserPreferenceChanged and removing them upon disposal of the control.

ToolStrip内存泄漏

connect. microsoft/VisualStudio/feedback/details/115600/toolstrip-leaks-after-calling-dispose#