Close child dialogs when closing parent

Question

I am writing a Windows shell extension in C # using EZShellExtensions.NET .

I enter a context menu that displays dialogs.

Suppose I show the explorer window (A). Then I use the context menu to display a modeless window (B).

On Windows XP and Windows Vista, when I close A, B closes (I want this behavior). However, in Windows 7, when I close A, B does not close, but does not respond to events. My questions:

• Do you know why Windows 7 manages the displayed form as a child?
• Is there a way to maintain a message loop if I close A?

EDIT : if I set A as owner of B, when I close A, B also closes. But it creates a new problem . B is always above A.

Answer 1

Finally, I implemented it as follows. The dialog is displayed using ShowDialog() , but it starts (and is created in the stream). ShowDialog() implements its own message loop, since the form runs in the stream, the main form responds to events, and you can close the main form, and the child form still responds to events. This is very useful for the ShellExtension application.

Remember that you will leave everything on your form to free up the thread, as well as the shell extension thread (each shell extension window and children are executed in the stream).

The following code fixed my problem:

  protected virtual void SetupViewControl() { ThreadPool.QueueUserWorkItem(new WaitCallback(DoSetupViewControl)); while (!mViewControlCreated) { // wait for view control created Thread.Sleep(100); } } private bool mViewControlCreated = false; protected virtual void DoSetupViewControl(object state) { mViewControl = ViewControlFactory.CreateViewControl(); mViewControl.Dock = DockStyle.Fill; mViewControl.Initialize(); this.Controls.Clear(); this.Controls.Add(mViewControl); IntPtr wHnd = GetActiveWindow(); IWin32Window owner = GetOwner(wHnd); mViewControlCreated = true; ShowDialog(owner); this.Dispose(); } private IWin32Window GetOwner(IntPtr wHnd) { if (wHnd == IntPtr.Zero) return null; return new WindowWrapper(wHnd); } [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)] private static extern IntPtr GetActiveWindow(); private class WindowWrapper : IWin32Window { private IntPtr mHwnd; public WindowWrapper(IntPtr handle) { mHwnd = handle; } public IntPtr Handle { get { return mHwnd; } } }