`Microsoft.ui.xaml.dll` is unable to load

user_417896 0
Viewed 5174

I am getting an exception in my WinUI3 app that Microsoft.ui.xaml.dll is unable to load. I have included Microsoft.UI.Xaml and Microsoft.Graphics.Win2D in nuget.

System.DllNotFoundException
  HResult=0x80131524
  Message=Unable to load DLL 'Microsoft.ui.xaml.dll' or one of its dependencies: The specified module could not be found. (0x8007007E)
  Source=TibraUI
  StackTrace:
   at TibraUI.Program.XamlCheckProcessRequirements()
   at TibraUI.Program.Main(String[] args) in C:\Users\Bryan\src\tibra\Tibra\TibraUI\obj\x64\Debug\net6.0-windows10.0.19041.0\win10-x64\App.g.i.cs:line 28

Windows Version 21H1 Build 19043.1348

My App.xaml

<Application
    x:Class="TibraUI.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:TibraUI">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
                <!-- Other merged dictionaries here -->
            </ResourceDictionary.MergedDictionaries>
            <!-- Other app resources here -->
        </ResourceDictionary>
    </Application.Resources>
</Application>
winui-3 visual-studio
2 Answers

Run the package as the startup project. It's not intuitive, but the main project is not meant to run.

This answer only applies to those who created a project that included a package project.

user_20045320

I was able to solve the issue in the following way:

I created a Uno WinUI 3 .NET 6 project using dotnet new unoapp-winui-net6 from the command prompt. I had to update the Windows.Desktop.csproj reference from:

<ItemGroup> 
    <FrameworkReference Update="Microsoft.Windows.SDK.NET.Ref" RuntimeFrameworkVersion="10.0.18362.16" /> 
    <FrameworkReference Update="Microsoft.Windows.SDK.NET.Ref" TargetingPackVersion="10.0.18362.16" /> 
</ItemGroup>

to:

<ItemGroup>
    <FrameworkReference Update="Microsoft.Windows.SDK.NET.Ref" RuntimeFrameworkVersion="10.0.19041.22" />
    <FrameworkReference Update="Microsoft.Windows.SDK.NET.Ref" TargetingPackVersion="10.0.19041.22" />
</ItemGroup>

and in the Windows.Package.wapproj, I updated

<ItemGroup>
    <PackageReference Include="Microsoft.WindowsAppSDK" Version="[1.0.0-experimental1]">
        <IncludeAssets>build</IncludeAssets>
    </PackageReference>
</ItemGroup>

to

<ItemGroup>
    <PackageReference Include="Microsoft.WindowsAppSDK" Version="[1.0.0]">
        <IncludeAssets>build</IncludeAssets>
    </PackageReference>
</ItemGroup>

(see also https://github.com/unoplatform/uno/discussions/7617)

In the Configuration Manager in Visual Studio 2022 Preview 1.1, I then had to change the platform for Windows.Desktop to x64 (was x86). Windows.package should also be x64.

I set the Windows.Package project as the startup project. I could build and start the application without the error.

user_4070610
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