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I was wondering if any of vcs knows how to fix this damn error, (I want to open another window but it gives this error at start time) = can help?
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I don’t use more than 1 window for applications, just use the main window and fill it with Viewmodels-linked usercontrols in the MVVM model, but usually when it comes to using different threadVoce has to use with Dispatcher.Invoke(...)
see my example to change the background color of a message popup (Toast type)
TempBackgroundColor.Dispatcher.Invoke(() => TempBackgroundColor = corfundo);
as mentioned by Anderson Henrique without more information we can not help
a kick in the dark (and without testing anything) I would use something like this:
var w = new Window();
this.Dispatcher.Invoke(() => w.Show());
The this in case it is your MainWindow.
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If you post the code maybe to give a helping hand but so it gets hard, post the code.
– Anderson Henrique