Please add support pin to taskbar for desktop apps

[Gaoyifei1011]

Describe the bug

In the WinRT API WIndows.UI.Shell namespace, the inside of the TaskbarManager class can provide some fixed method applied to the task bar. With the new fixed taskbar notification update in Windows 11 22621 beta, we found that notification transitioned from CoreWindow to ToastNotificaton. In further exploration, we found that for desktop applications, the function of the new Toast notification fixed to the taskbar has been locked for desktop applications, and the corresponding function needs to be unlocked in order to use it. We hope that the future version can unlock this function for desktop applications, and provide a corresponding method to detect whether this function is available.

Steps to reproduce the bug

See describe bug description

Expected behavior

Please unlock the pin to taskbar for deskop features

Screenshots

An exception message when unlocked

引发的异常:“System.UnauthorizedAccessException”(位于 System.Private.CoreLib.dll 中)
WinRT 信息: Feature com.microsoft.windows.taskbar.pin is not available.
“System.UnauthorizedAccessException”类型的异常在 System.Private.CoreLib.dll 中发生，但未在用户代码中进行处理
WinRT 信息: Feature com.microsoft.windows.taskbar.pin is not available.
拒绝访问。

Content prompted after unlocking (desktop app)

Corresponding code

        Task.Run(async () =>
        {
            bool IsPinnedSuccessfully = false;

            try
            {
                string featureId = "com.microsoft.windows.taskbar.pin";
                string token = FeatureAccessHelper.GenerateTokenFromFeatureId(featureId);
                string attestation = FeatureAccessHelper.GenerateAttestation(featureId);
                LimitedAccessFeatureRequestResult accessResult = LimitedAccessFeatures.TryUnlockFeature(featureId, token, attestation);

                if (accessResult.Status is LimitedAccessFeatureStatus.Available)
                {
                    IsPinnedSuccessfully = await TaskbarManager.GetDefault().RequestPinCurrentAppAsync();
                }
            }
            catch (Exception e)
            {
                // None
            }
            finally
            {
               // None
            }
        });

public static class FeatureAccessHelper
{
    private static string packageFamilyName = Package.Current.Id.FamilyName;

    // Windows 11 22621 受限的 API 和对应的访问密钥
    private static readonly Dictionary<string, string> LimitedAccessFeaturesDict = new Dictionary<string, string>()
    {
        { "com.microsoft.services.cortana.cortanaactionableinsights_v1", "nEVyyzytE6ankNk1CIAu6sZsh8vKLw3Q7glTOHB11po=" },
        { "com.microsoft.windows.applicationmodel.conversationalagent_v1", "hhrovbOc/z8TgeoWheL4RF5vLLJrKNAQpdyvhlTee6I" },
        { "com.microsoft.windows.applicationmodel.phonelinetransportdevice_v1", "cb9WIvVfhp+8lFhaSrB6V6zUBGqctteKi/f/9AIeoZ4" },
        { "com.microsoft.windows.applicationwindow", "e5a85131-319b-4a56-9577-1c1d9c781218" },
        { "com.microsoft.windows.callcontrolpublicapi_v1", "6e7e52aa-cddb-4e57-9f1c-7dd511ad7d01" },
        { "com.microsoft.windows.focussessionmanager.1", "ba3faac1-0878-4bb9-9b35-2224aa0ee7cf" },
        { "com.microsoft.windows.geolocationprovider", "6D1544E3-55CB-40D2-A022-31F24E139708" },
        { "com.microsoft.windows.holographic.keyboardcursor_v1", "FE676B8B-E396-4A80-9573-B67542840E5C" },
        { "com.microsoft.windows.holographic.shell", "527f4968-f193-419a-b91f-46b9106e1129" },
        { "com.microsoft.windows.holographic.xrruntime.1", "036EFF74-8BF2-4249-82AF-92235C6E1A10" },
        { "com.microsoft.windows.holographic.xrruntime.2", "58AA36EF-7C1A-4A56-9308-FC882F56465A" },
        { "com.microsoft.windows.richeditmath", "RDZCQjY2M0YtQkFDMi00NkIwLUI3NzEtODg4NjMxMEVENkFF" },
        { "com.microsoft.windows.shell.sharewindowcommandsource_v1", "yDvrila5HS/y8SctohQM3WJZOby8NbSoL2hEPTyIRco=" },
        { "com.microsoft.windows.system.remotedesktop.provider_v1", "2F712169EF57A9FB0D590593743819F5F47E2DD13E4D9A5458DDA77608CC5E10" },
        { "com.microsoft.windows.taskbar.pin", "4096B239A7295B635C090E647E867B5707DA6AB6CB78340B01FE4E0C8F4953D4" },
        { "com.microsoft.windows.taskbar.requestPinSecondaryTile", "04c19204-10d9-450a-95c4-2910c8f72be3" },
        { "com.microsoft.windows.ui.notifications.preview.toastOcclusionManagerPreview", "738a6acf-45c1-44ed-85a4-5eb11dc2d084" },
        { "com.microsoft.windows.updateorchestrator.1", "20C662033A4007A55375BF00D986C280B41A418F" },
        { "com.microsoft.windows.windowdecorations", "425261a8-7f73-4319-8a53-fc13f87e1717" },
    };

    public static string GenerateTokenFromFeatureId(string featureId)
    {
        string generatedContent = string.Format("{0}!{1}!{2}", featureId, LimitedAccessFeaturesDict[featureId], packageFamilyName);
        byte[] computedHash = HashAlgorithmHelper.ComputeSHA256Hash(generatedContent);
        byte[] tokenBytes = new byte[16];
        Array.Copy(computedHash, tokenBytes, tokenBytes.Length);
        return Convert.ToBase64String(tokenBytes);
    }

    public static string GenerateAttestation(string featureId)
    {
        return string.Format("{0} has registered their use of {1} with Microsoft and agrees to the terms of use.", packageFamilyName.Split('_').Last(), featureId);
    }
}

NuGet package version

Windows App SDK 1.4.0: 1.4.230822000

Packaging type

Packaged (MSIX)

Windows version

Windows 11 version 22H2 (22621, 2022 Update)

IDE

Visual Studio 2022

Additional context

Reference Links

Pin your app to the taskbar
https://learn.microsoft.com/zh-cn/windows/apps/design/shell/pin-to-taskbar

A principled approach to app pinning and app defaults in Windows
https://blogs.windows.com/windowsexperience/2023/03/17/a-principled-approach-to-app-pinning-and-app-defaults-in-windows/

[DarranRowe]

Just to confirm it isn't a documentation issue, have you tried using IInitializeWithWindow/InitializeWithWindow?

[Gaoyifei1011]

Just to confirm it isn't a documentation issue, have you tried using IInitializeWithWindow/InitializeWithWindow?

No, it doesn't need to. When a new taskbar that uses toast notification is fixed, it can even run in background threads (non-UI threads)

[DarranRowe]

Right, the current behaviour is documented.
However, I'm not going to write any more than that since this is a feature proposal.

[Gaoyifei1011]

Right, the current behaviour is documented. However, I'm not going to write any more than that since this is a feature proposal.

MHM. Thank you very much for your advice. Before Microsoft improved the taskbar fixed prompt, corewindow was used, which was not implemented in the desktop application, only applicable to uwp, if the desktop application needs to be forcibly fixed to the taskbar, it needs to implement its own ipinnedlist3 interface, reference link (https://geelaw.blog/entries/msedge-pins/), but after Microsoft improved this prompt, Desktop applications can also use this functionality, but there is no good way to implement it directly for desktop applications.

So, I guess that's one of the reasons why Microsoft hasn't updated the documentation. Also, in the official winui3 documentation (which was supported when uwp migrated to winui3), Microsoft does not implement the methods in the taskbarmanager class.
https://learn.microsoft.com/zh-cn/windows/apps/windows-app-sdk/migrate-to-windows-app-sdk/what-is-supported