Why is Rider executing Avalonia application code after building it?

Problem

When writing an Avalonia application, one might notice that some code is being executed before starting the application.

Cause

The behavior can be caused by the AvaloniaRider plugin. This plugin provides support for Avalonia development, including a screen layout preview. It partially executes the application to generate the layout of the screen.

Resolution

Avalonia has a Design.IsDesignMode property that can be used to determine if specific code should be executed in design/preview mode.

Usage example:

if (Design.IsDesignMode)
{
     // code executed at design time
}

More information about design-time properties and data can be found in Avalonia documentation:

How To Use Live Preview

How To Use Design-time Data