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TabControl SelectionChanged event and SelectedContent property

Scope

Minor

Version Introduced

4.7.1

Source Analyzer Status

NotPlanned

Change Description

Starting with the .NET Framework 4.7.1, a xref:System.Windows.Controls.TabControl updates the value of its xref:System.Windows.Controls.TabControl.SelectedContent property before raising the xref:System.Windows.Controls.Primitives.Selector.SelectionChanged event, when its selection changes.

In the .NET Framework 4.7 and earlier versions, the update to SelectedContent happened after the event.

Quirked
Build-time break

Recommended Action

Apps that target the .NET Framework 4.7.1 or later can opt out of this change and use legacy behavior by adding the following to the <runtime> section of the application configuration file:

<runtime>
   <AppContextSwitchOverrides value="Switch.System.Windows.Controls.TabControl.SelectionPropertiesCanLagBehindSelectionChangedEvent=true" />
</runtime>

Apps that target the .NET Framework 4.7 or earlier but are running on the .NET Framework 4.7.1 or later can enable the new behavior by adding the following line to the <runtime> section of the application .configuration file:

<runtime>
   <AppContextSwitchOverrides value="Switch.System.Windows.Controls.TabControl.SelectionPropertiesCanLagBehindSelectionChangedEvent=false" />
</runtime>

Affected APIs

P:System.Windows.Controls.TabControl.SelectedContent
E:System.Windows.Controls.Primitives.Selector.SelectionChanged

1.6 KiB Raw Blame History