使用Command来执行异步操作，并在Command中实现ICancellableCommand接口来处理取消操作，避免界面冻结。

代码示例：

public class AsyncCommand : ICommand, ICancellableCommand
{
    private readonly Func _execute;
    private bool _isExecuting;

    public AsyncCommand(Func execute)
    {
        _execute = execute;
    }

    public bool CanExecute(object parameter)
    {
        return !_isExecuting;
    }

    public async void Execute(object parameter)
    {
        _isExecuting = true;
        try
        {
            await _execute();
        }
        finally
        {
            _isExecuting = false;
        }
    }

    public void Cancel()
    {
        // TODO: Implement cancellation
    }

    public event EventHandler CanExecuteChanged;
}

使用方法：

private AsyncCommand _asyncCommand;

public ViewModel()
{
    _asyncCommand = new AsyncCommand(ExecuteAsync);
}

public ICommand AsyncCommand => _asyncCommand;

private async Task ExecuteAsync()
{
    // TODO: Implement asynchronous operation
}