DelegateCommand异步等待与Task.Run UI锁定

public class RelayCommandAsync : ICommand
{
    private readonly Func<Task> _execute;
    private readonly Func<bool> _canExecute;

    public RelayCommandAsync(Func<Task> execute, Func<bool> canExecute = null)
    {
        _execute = execute ?? throw new ArgumentNullException(nameof(execute));
        _canExecute = canExecute;
    }

    public bool CanExecute(object parameter)
    {
        return _canExecute == null || _canExecute();
    }

    public async void Execute(object parameter)
    {
        await _execute();
    }

    public event EventHandler CanExecuteChanged
    {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }
}

// Usage in ViewModel
public RelayCommandAsync MyAsyncCommand { get; }

public MyViewModel()
{
    MyAsyncCommand = new RelayCommandAsync(async () =>
    {
        // Perform long-running task here
        await Task.Delay(1000); // Simulate work

        // Update UI after task completion
        Application.Current.Dispatcher.Invoke(() =>
        {
            // UI update code here
        });
    });
}