How to know if the window state has changed to maximized in WPF

Introduction

In this post we will see how we can identify if the application has been maximized or it is restored to normal state. We will use the Resize event equivalent in WPF which is SizeChanged event. We will subscribe to this event and will check the window state to identify if the window has been maximized or it is restored to normal.

Application.Current.MainWindow.SizeChanged += WindowSizeChanged;
private void WindowSizeChanged(object sender, SizeChangedEventArgs e)
{
    this.HandleWindowState();
}
 
private void HandleWindowState()
{
    WindowState windowState = Application.Current.MainWindow.WindowState;
    if (windowState == WindowState.Maximized)
     {                    
     }
    else if (windowState == WindowState.Normal)
     {                    
     }            
}

And let’s not forget to clean it by unsubscribing to the SizeChanged event by

Application.Current.MainWindow.SizeChanged -= WindowSizeChanged;

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Libish Varghese Jacob

Libish Varghese JacobI am currently working as a lead engineer in one of the leading wind turbine manufacturing firm. I have wide range of interests and getting my hands dirty in technology is one among them. I use this platform primarily as my knowledge base. I also use this platform to share my experience and experiments so that it might help someone who is walking the way I already did. The suggestions expressed here are the best to my knowledge at the time of writing and this may not necessarily be the best possible solution. I would pretty much appreciate if you could comment on it to bring into my notice on what could have been done better.