[Bug] Working with CoreWebView2 in MAUI Blazor (hybrid) in combination with Identity results in compile errors

[edwinvandriel]

Hi,

I'm building a Maui blazor (hybrid) application. To handle some browser (webview) permissions I'm using a custom DialogPermissionRequestHandler which uses CoreWebView2, CoreWebView2PermissionRequestedEventArgs and some enumerations.
All this to make the camera working from blazor hybrid and works fine.

When I'm adding the Microsoft.Identity.Client nuget package version 4.46.0 my application breaks.
Here are the lines from the build log:

---

.\Platforms\Windows\SilentPermissionRequestHandler.cs(8,43,8,55): error CS0433: The type 'CoreWebView2' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

.\Platforms\Windows\SilentPermissionRequestHandler.cs(8,64,8,104): error CS0433: The type 'CoreWebView2PermissionRequestedEventArgs' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

.\Platforms\Windows\IPermissionRequestHandler.cs(5,36,5,48): error CS0433: The type 'CoreWebView2' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

.\Platforms\Windows\IPermissionRequestHandler.cs(5,57,5,97): error CS0433: The type 'CoreWebView2PermissionRequestedEventArgs' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

.\Platforms\Windows\DialogPermissionRequestHandler.cs(16,49,16,61): error CS0433: The type 'CoreWebView2' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

.\Platforms\Windows\DialogPermissionRequestHandler.cs(16,70,16,110): error CS0433: The type 'CoreWebView2PermissionRequestedEventArgs' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

.\Platforms\Windows\DialogPermissionRequestHandler.cs(45,49,45,75): error CS0433: The type 'CoreWebView2PermissionKind' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

.\Platforms\Windows\DialogPermissionRequestHandler.cs(10,37,10,63): error CS0433: The type 'CoreWebView2PermissionKind' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

.\Platforms\Windows\DialogPermissionRequestHandler.cs(10,65,10,92): error CS0433: The type 'CoreWebView2PermissionState' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

---

When I remove the nuget package everything works again.

Looks like Identity package introduces these WebView2 classes but from other libraries.
The custom permission handler I used are from this sample https://github.com/MackinnonBuck/MauiBlazorPermissionsExample

[bgavrilMS]

Yes on net6-windows10... target framework, MSAL references:

We are planning to remove this reference, but I do not have an ETA. It should be possible to force your app to use the exact reference.

[edwinvandriel]

Do you or somebody else know how I can force to use the exact reference?

[bgavrilMS]

See https://docs.microsoft.com/en-us/dotnet/standard/library-guidance/dependencies

You can try to reference the version you need directly in your project, at the top level, for the windows target framework (net6-windows10..)

[edwinvandriel]

I just want to leave out the Microsoft.Web.WebView2.Core assemblies from the reference
I've tried some things from the link you've mentioned but without any luck.
An example on how to do this would be appreciated.

[bgavrilMS]

@SameerK-MSFT was looking to create a MAUI + B2C + Blazor sample and may be able to help.

[bgavrilMS]

I can think of a workaround. Instead of referencing MSAL's net5-windows10 version, you can force reference a different target, i.e. the netcoreapp2.1 target.

Something like

<ItemGroup>

    <PackageReference Include="Microsoft.Identity.Client" ExcludeAssets="all" GeneratePathProperty="true" Version="4.46.0"/>

    <Reference Include="Microsoft.Identity.Client" >

      <HintPath>$(PkgMicrosoft_Identity_Client)\lib\netcoreapp2.1\Microsoft.Identity.Client.dll</HintPath>

    </Reference>

  </ItemGroup>

[aetos382]

related issue: microsoft/microsoft-ui-xaml#5689

[aetos382]

Microsoft.Identity.Client references Microsoft.Web.WebView2 since v4.28.0.
Therefore, libraries that reference this library (such as Microsoft.Graph, Microsoft.Data.SqlClient, and so on) are not compatible with WinUI 3.0.

[bgavrilMS]

Interesting, thanks for the update @aetos382 ... We do have a WinUI 3.0 sample and we have tested it with MSAL and did not see any error. Can you provide some repro steps?

[aetos382]

https://github.com/aetos382/WinUIApp

This repository contains a simple WinUI 3 app.
I just created an empty WinUI 3 app in VS 2022, placed WebView2 into the MainWindow, and added the Microsoft.Data.SqlClient package to the reference.
When I build this project, I get the following error.

error CS0433: The type 'CoreWebView2' exists in both 'Microsoft.Web.WebView2.Core, Version=1.0.864.35, Culture=neutral, PublicKeyToken=2a8ab48044d2601e' and 'Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b'

If I remove the reference to the Microsoft.Data.SqlClient package from the project, or downgrade its version to v4.x, I will be able to build it.
This is because v5.x of the Microsoft.Data.SqlClient package requires the Microsoft.Identity.Client package v4.45 or later, which references the Microsoft.Web.WebView2 package.

[ancker1]

I have the same issue when using Microsoft.Identity.Client in a WinUIproject.

The problem arises when making a self contained WinUI application. @bgavrilMS did you make a packaged WinUI app? Because then you would not see the problem.

[ancker1]

Based on the comment from @aetos382 I downgraded "Microsoft.Identity.Client" to version 4.27.1 and "Microsoft.Identity.Client.Extensions.Msal" to version 2.18.0 and it not works.