How to Scale WPF application according to screen resolution?

Question

I make a WPF application in .Net Framework 4.7. I developed this application on my Laptop which has full HD resolution (1920*1080). My problem is when I run my application on a low resolution monitor (1366*768), my application don't scale up according to the screen resolution. I tried using Per monitor DPI and do some edit in my App.Manifest but still the problem.

Answer 1

You can set Width and Height of the window according to the device's dispaly resolution, you can set it like below:

    <Window x:Class="WPFScale.MainWindow"  
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
            xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
            xmlns:local="clr-namespace:WPFScale"  
            mc:Ignorable="d"  
            Width="{x:Static SystemParameters.PrimaryScreenWidth}"  
            Height="{x:Static SystemParameters.PrimaryScreenHeight}"  
            Title="MainWindow">  
        <Grid>  
             
        </Grid>  
    </Window>  

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Answer 2

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            int nWidth = (int)System.Windows.SystemParameters.PrimaryScreenWidth;
            int nHieght = (int)System.Windows.SystemParameters.PrimaryScreenHeight;

            this.LayoutTransform = new ScaleTransform(nWidth / 1920, nHieght / 1080);
        }