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Asked: 2026-06-02T13:03:04+00:00

I have a WPF application, and define the window in XAML as maximized, and

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I have a WPF application, and define the window in XAML as maximized, and 1080×1920 (1080p vertical format):

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"           
    x:Class="PLBCarousel.MainWindow"
    x:Name="Window"
    Width="1080" Height="1920" WindowStartupLocation="CenterScreen" WindowState="Maximized" KeyDown="Window_KeyDown">

When I run the application on a 1080w x 1920h display, with taskbar hidden, it starts maximized, but all the elements are misaligned, and watch window provides the following values:

    System.Windows.SystemParameters.PrimaryScreenHeight 1536.0  double
    System.Windows.SystemParameters.PrimaryScreenWidth  864.0   double

This application has displayed correctly on the same display in the past, but the screen was used as a secondary display, rather than primary.

Any ideas why this is happening? I think the above two values should resolve to 1920 and 1080 respectively.

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1 Answer

  1. Editorial Team

    Turns out I needed to change my system DPI, after reinstalling my OS. Instructions for doing that on Win 7 can be found here: Win 7 DPI change.

    Thanks to Kristopher Johnson’s link above which helped.

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