EngineGetMenuCommandAsync Method

public virtual Task<IMenuCommand> GetMenuCommandAsync(
	Guid menuGuid,
	IOperationContext operationContext = null
)

Public Overridable Function GetMenuCommandAsync ( 
	menuGuid As Guid,
	Optional operationContext As IOperationContext = Nothing
) As Task(Of IMenuCommand)

public:
virtual Task<IMenuCommand^>^ GetMenuCommandAsync(
	Guid menuGuid, 
	IOperationContext^ operationContext = nullptr
)

abstract GetMenuCommandAsync : 
        menuGuid : Guid * 
        ?operationContext : IOperationContext 
(* Defaults:
        let _operationContext = defaultArg operationContext null
*)
-> Task<IMenuCommand> 
override GetMenuCommandAsync : 
        menuGuid : Guid * 
        ?operationContext : IOperationContext 
(* Defaults:
        let _operationContext = defaultArg operationContext null
*)
-> Task<IMenuCommand> 

<Extensions>
  <desktop3:Extension Category="windows.cloudFiles">
    <desktop3:CloudFiles>
      <desktop3:CustomStateHandler Clsid="000562AA-2879-4CF1-89E8-0AEC9596FE19"/>
      <desktop3:ThumbnailProviderHandler Clsid="05CF065E-E135-4B2B-9D4D-CFB3FBAC73A4"/>

      <desktop3:ExtendedPropertyHandler Clsid="20000000-0000-0000-0000-000000000001"/>
      <desktop3:BannersHandler Clsid="20000000-0000-0000-0000-000000000001"/>

      <desktop3:CloudFilesContextMenus>
        <desktop3:Verb Id="LockCommand" Clsid="9C923BF3-3A4B-487B-AB4E-B4CF87FD1C25" />
      </desktop3:CloudFilesContextMenus>

      <desktop4:ContentUriSource Clsid="6D45BC7A-D0B7-4913-8984-FD7261550C08"/>

    </desktop3:CloudFiles>
  </desktop3:Extension>
  <com:Extension Category="windows.comServer">
    <com:ComServer>
      <com:ExeServer DisplayName="VirtualDrive" Executable="dummy.exe">
        <com:Class Id="05CF065E-E135-4B2B-9D4D-CFB3FBAC73A4" />
      </com:ExeServer>

      <com:ExeServer DisplayName="VirtualDrive" Executable="dummy.exe">
        <com:Class Id="9C923BF3-3A4B-487B-AB4E-B4CF87FD1C25" />
      </com:ExeServer>

      <com:ExeServer DisplayName="VirtualDrive" Executable="dummy.exe">
          <com:Class Id="000562AA-2879-4CF1-89E8-0AEC9596FE19" />
      </com:ExeServer>

      <com:ExeServer DisplayName="VirtualDrive" Executable="dummy.exe">
          <com:Class Id="6D45BC7A-D0B7-4913-8984-FD7261550C08" />
      </com:ExeServer>
</com:ComServer>
  </com:Extension>
</Extensions>

public class MenuCommandLock : IMenuCommandWindows
{
    private readonly VirtualEngineBase engine;
    private readonly ILogger logger;

    private const string lockCommandIcon = @"Images\Locked.ico";
    private const string unlockCommandIcon = @"Images\Unlocked.ico";

    public MenuCommandLock(VirtualEngineBase engine, ILogger logger)
    {
        this.engine = engine;
        this.logger = logger.CreateLogger("Lock Menu Command");
    }

    public async Task<string> GetTitleAsync(IEnumerable<string> filesPath)
    {
        bool isLocked = await IsLockedAsync(filesPath) == true;
        return isLocked ? "Unlock" : "Lock";
    }

    public async Task<string> GetIconAsync(IEnumerable<string> filesPath)
    {
        string iconName = await IsLockedAsync(filesPath) == false ? lockCommandIcon : unlockCommandIcon;
        string iconPath = Path.Combine(Path.GetDirectoryName(typeof(MenuCommandLock).Assembly.Location), iconName);
        return iconPath;
    }

    public async Task<MenuState> GetStateAsync(IEnumerable<string> filesPath)
    {
        // This sample can not lock folders.
        // Hide menu if any folders are selected.
        foreach (string userFileSystemPath in filesPath)
        {
            FileAttributes attr = File.GetAttributes(userFileSystemPath);
            if ((attr & FileAttributes.Directory) == FileAttributes.Directory)
                return MenuState.Hidden;
        }

        bool? isLocked = await IsLockedAsync(filesPath);
        return isLocked.HasValue ? MenuState.Enabled : MenuState.Hidden;
    }

    public async Task InvokeAsync(IEnumerable<string> filesPath, IEnumerable<byte[]> remoteStorageItemIds = null, CancellationToken cancellationToken = default)
    {
        // If you need a remote storage ID for each item use the following code:
        //foreach (string userFileSystemPath in filesPath)
        //{
        //    if(engine.Placeholders.TryGetItem(userFileSystemPath, out PlaceholderItem placeholder))
        //    {
        //        byte[] remoteStorageId = placeholder.GetRemoteStorageItemId();
        //    }
        //}

        bool isLocked = await IsLockedAsync(filesPath) == true;
        foreach (string userFileSystemPath in filesPath)
        {
            try
            {
                IClientNotifications clientNotifications = engine.ClientNotifications(userFileSystemPath, logger);
                if (isLocked)
                    await clientNotifications.UnlockAsync();
                else
                    await clientNotifications.LockAsync();
            }
            catch (Exception ex)
            {
                string actionName = isLocked ? "Unlock" : "Lock";
                logger.LogError($"Failed to {actionName} item", userFileSystemPath, null, ex);
            }
        }
    }

    public async Task<string> GetToolTipAsync(IEnumerable<string> filesPath)
    {
        bool isLocked = await IsLockedAsync(filesPath) == true;
        return isLocked ? "Unlock item(s)" : "Lock item(s)";
    }

    private async Task<bool?> IsLockedAsync(IEnumerable<string> filesPath, CancellationToken cancellationToken = default)
    {
        bool? allLocked = null;
        foreach (string userFileSystemPath in filesPath)
        {
            try
            {
                bool isLocked = false;
                if (engine.Placeholders.TryGetItem(userFileSystemPath, out PlaceholderItem placeholder))
                {
                    if (placeholder.Properties.TryGetLockInfo(out ServerLockInfo lockInfo))
                    {
                        // Detect if locked by this user.
                        if (!engine.IsCurrentUser(lockInfo.Owner))
                        {
                            // Typically we can not unlock items locked by other users.
                            // We must hide or disable menu in this case.
                            return null;
                        }
                        isLocked = true;
                    }
                }

                if (allLocked.HasValue && (allLocked != isLocked))
                {
                    return null;
                }

                allLocked = isLocked;
            }
            catch (Exception ex)
            {
                logger.LogError("Failed to get lock state", userFileSystemPath, null, ex);
            }
        }

        return allLocked;
    }
}

public override async Task<IMenuCommand> GetMenuCommandAsync(Guid menuGuid, IOperationContext operationContext = null)
{
    // For this method to be called you need to register a menu command handler.
    // See method description for more details.

    Logger.LogDebug($"{nameof(IEngine)}.{nameof(GetMenuCommandAsync)}()", menuGuid.ToString(), default, operationContext);

    Guid menuCommandLockGuid = typeof(ShellExtension.ContextMenuVerbIntegrated).GUID;

    if (menuGuid == menuCommandLockGuid)
    {
        return new MenuCommandLock(this, this.Logger);
    }

    Logger.LogError($"Menu not found", Path, menuGuid.ToString(), default, operationContext);
    throw new NotImplementedException();
}