Questions

Right now I’m encountering a strange problem.

1. Open C# WPF app containing SciChart on Windows Server 2012 R2 computer.
2. Open a tabbed view that contains SciChartSurface.
3. Press Ctrl-Alt-Del and Switch User. Select user and type in login password.
   Instead of switching user, Remote Desktop can be used to log in to the Windows Server 2012 R2 computer.
4. After password is entered, an InvalidOperationException would occasionally appear. Enclosed is a popup dialog that appears when the exception occurs.

The error message says “Specified element is already the logical child of another element. Disconnect it first.”

However, the problem doesn’t occur every time though.

This problem never occurs on Windows 7, and it may be related to how DataContext gets changed in newer versions of Windows (like Windows 10 and Windows Server 2012 R2) after remote login or user switch.

Here’s a link to a StackOverflow question posted by someone else regarding this DataContext issue: http://stackoverflow.com/questions/40996366/wpf-view-constructor-called-on-windows-switch-user-or-remote-desktop-login

Somehow, a DataContext change would occasionally glitch up SciChart to produce this exception. This is problematic because one of our customers installed our WPF software application (containing SciChart) on a Windows Server 2012 R2 machine, and would remote login to that machine to run the app. Occasionally the Windows Remote Desktop would lose its connection (understandable), but when the customer logs in again, if the screen the customer was on contained a SciChart surface, the app would occasionally display the InvalidOperationException and crash.