Why usercontrols loaded event is not fired
Solution 1
This is because an exception is being thrown in the 'Loaded' eventhandler. The exception may be occurring as a result of a mixed mode assembly or some other exception that is "user handled", and the WPF framework is catching it (unknown to the debugger). This causes the debugger not to break when a breakpoint is set within the Loaded method.
To make sure you can see exactly what error is occurring:
- In VS2010 go to Debug | Exceptions.
- Tick "Thrown" exception radio boxes for the exceptions that may be applicable in your case.
- Re-run the app and VS2010 should break on the exception that is being thrown in the event handler.
- Debug according to a now known exception.
Solution 2
Does your UserControl constructor still make a call InitializeComponent()
, without this, it will not build up its visuals and the Loaded
event may not fire.
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Nasenbaer
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Updated on June 01, 2022Comments
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Nasenbaer about 2 years
I have a user control. I had this situations again some times but could always fix it by using the "
New()
contructor". But I still wonder what I am doing wrong because the load event has to be fired if control was loaded!Here is some code:
<Window x:Class="MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:my="clr-namespace:OUTPUT___VideoContent" Title="OUTPUT - VideoContent" Height="350" Width="525" Icon="/OUTPUT%20-%20VideoContent;component/Images/VideoContent.png"> <Grid x:Name="LayoutRoot"> <Grid x:Name="VideoGrid"> <my:ucVideoPresenter x:Name="VideoPresenter1"/> <TextBlock x:Name="txtInfo" Visibility="Collapsed" /> </Grid> </Grid> </Window>
and in the usercontrol, the load event is declared on WPF or codebehing without any success!
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EpiGen almost 9 yearsDo you know how to add event handler "not firing" exception? "Add" option does not give any ready bounded to events or there is no anything close to "System.Windows.Input".
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Nasenbaer over 3 years
InitializeComponent()
is completed correctly. Usercontrol has no Exceptions while loading.