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POWPF: Does MessageBox Break PreviewMouseDown?
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Id
546388
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AcceptedAnswerId
0
AnswerCount
2
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CommentCount
0
CommunityOwnedDate
CreationDate
2009-02-13T15:38:12.210
FavoriteCount
0
LastActivityDate
2009-03-30T22:44:37.103
LastEditDate
2017-05-23T11:46:41.763
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-1
OwnerUserId
83
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PostTypeId
1
Score
8
ViewCount
2508
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text
Body
I've been trying to get my WPF application to prompt users to either discard their unsaved changes or to cancel when they navigate using a TreeView. <ul> <li><a href="https://stackoverflow.com/questions/542392/how-can-i-cancel-a-users-wpf-treeview-click">How can I cancel a user’s WPF TreeView click?</a></li> <li><a href="https://stackoverflow.com/questions/543312/how-do-i-properly-handle-a-previewmousedown-event-with-a-messagebox-confirmation/545534#545534">How do I properly handle a PreviewMouseDown event with a MessageBox confirmation?</a></li> </ul> I think I've found a bug. The MessageBox does not play nice with PreviewMouseDown. It seems to "handle" a click regardless of how its e.Handled is set if there's a MessageBox shown. For this XAML... <pre><code><TreeView Name="TreeViewThings" ... PreviewMouseDown="TreeViewThings_PreviewMouseDown" TreeViewItem.Expanded="TreeViewThings_Expanded" TreeViewItem.Selected="TreeViewThings_Selected" > </code></pre> ...compare these alternative methods... <pre> Sub TreeViewNodes_PreviewMouseDown(...) e.Handled = False End Sub Sub TreeViewNodes_PreviewMouseDown(...) MessageBox.Show("Test", "Test", MessageBoxButton.OK) e.Handled = False End Sub </pre> These two methods behave differently. Without the MessageBox, <code>TreeViewNodes_Selected()</code> or <code>TreeViewThings_Expanded()</code> will execute. With the MessageBox, they won't. Is this a bug or is there something going on here that I should understand?
Tags
<.net><wpf><events><messagebox>
Title
WPF: Does MessageBox Break PreviewMouseDown?
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1. USZack Peterson
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