Windows 11 Theming Does Not Work In PowerShell WPF Window

[nkasco]

URL(s)

https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview4/9.0.0-preview.4.md

Description

The following code should render a Windows 11 style WPF Window in PowerShell 7 (fx dependent, using .NET 9 Preview 4)

Add-Type -AssemblyName PresentationFramework

[xml]$xaml = @"
<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Name="Window">
    <Window.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/PresentationFramework.Fluent;component/Resources/Fluent.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Window.Resources>
    <StackPanel>
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
            <TextBox x:Name="MyTextBox" Width="150" />
            <Button x:Name="SubmitButton" Content="Submit" Margin="5" />
        </StackPanel>
    </StackPanel>
</Window>
"@

$reader = (New-Object System.Xml.XmlNodeReader $xaml)
$window = [Windows.Markup.XamlReader]::Load($reader)

$window.ShowDialog()

Current Result: Black window, although I can tell the elements are there because if I hover over the textbox my cursor changes. Doesn't appear to be properly loading the ResourceDictionary

Confirmed that my PowerShell 7 console is using .NET 9 preview 4:

> [System.Runtime.InteropServices.RuntimeInformation]::FrameworkDescription
.NET 9.0.0-preview.4.24266.19

Perhaps I am just missing something beyond adding the proper ResourceDictionary?

[antonfirsov]

cc @dotnet/wpf-developers

[dipeshmsft]

Hey @antonfirsov, there is a slight issue here. As of now, the mechanism for accent color, theme switching, etc. will work when the resource dictionary is added to App.xaml, in coming preview releases we will add the support for using Win11 themes at window level explictly.

For now, you will have to add it in your app.xaml.

[nkasco]

Hey @antonfirsov, there is a slight issue here. As of now, the mechanism for accent color, theme switching, etc. will work when the resource dictionary is added to App.xaml, in coming preview releases we will add the support for using Win11 themes at window level explictly.

For now, you will have to add it in your app.xaml.

@dipeshmsft Appreciate this insights. Is there an issue, branch, or PR that can be tracked to know when it is released?

[nkasco]

Not fixed still in .NET 9 preview 5

[nkasco]

Not fixed still in .NET 9 preview 6

[antonfirsov]

@dotnet/wpf-developers is there a tracking issue in dotnet/wpf we can link, so we can close this? Or should we transfer this one?