[Windows] No application icon in the titlebar

[MartyIX]

Description

I created a new MAUI project and ran on Windows. I cannot see any application icon in my titlebar.

Steps to Reproduce

1. https://github.com/MartyIX/MauiAppIcon202407
2. Run on Windows
3. You should see and there is no application icon on the left:
   

Link to public reproduction project repository

No response

Version with bug

8.0.70 SR7

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

No response

Did you find any workaround?

No.

Relevant log output

No response

[github-actions]

Hi I'm an AI powered bot that finds similar issues based off the issue title.

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one and thumbs upping the other issue to help us prioritize it. Thank you!

Open similar issues:

• App Title Bar doesn't show the app icon (#6908), similarity score: 0.83

Closed similar issues:

• App Icon doesn't appear in window title bar (#20265), similarity score: 0.86
• [Windows] App icon doesn't show in window title (#7201), similarity score: 0.85
• App icon not showing in build (#3755), similarity score: 0.78
• Title Bar Oddities on Windows (#5453), similarity score: 0.78

Note: You can give me feedback by thumbs upping or thumbs downing this comment.

[MartyIX]

Ok, the bot is helpful. I found this comment #20265 (comment) and I can fix it using:

<maui:MauiWinUIApplication
    x:Class="MauiAppIcon202407.WinUI.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:maui="using:Microsoft.Maui"
    xmlns:local="using:MauiAppIcon202407.WinUI">
    
    <!-- <AddThis> -->
    <maui:MauiWinUIApplication.Resources>
        <DataTemplate x:Key="MauiAppTitleBarTemplate">
            <Border Canvas.ZIndex="1" VerticalAlignment="Stretch" Margin="0,0,0,0">
                <StackPanel Orientation="Horizontal" Margin="12, 0, 0, 0" x:Name="RootStackPanel">
                    <Image x:Name="AppFontIcon" HorizontalAlignment="Left" VerticalAlignment="Center" Source="appiconLogo.png" Visibility="Visible" Width="16" Height="16"/>
                    <TextBlock x:Name="AppTitle" VerticalAlignment="Center" Margin="{Binding WindowTitleMargin}" Text="{Binding WindowTitle}" 
                               Foreground="{Binding WindowTitleForeground}" Style="{StaticResource CaptionTextBlockStyle}" />
                </StackPanel>
            </Border>
        </DataTemplate>
    </maui:MauiWinUIApplication.Resources>
    <!-- </AddThis> -->

</maui:MauiWinUIApplication>

[MartyIX]

The second workaround is to change:

-<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />
+<MauiImage Include="Resources\AppIcon\square44x44logo.png" />

[MartyIX]

Duplicate of #6908