public static async Task TryExecuteAsync(this IViewModelCommand command, object arg)
{
if (command != null && command.CanExecute(arg))
{
await command.ExecuteAsync(arg);
}
}
public static async Task TryExecuteAsync(this IViewModelCommand command)
{
if (command != null && command.CanExecute())
{
await command.ExecuteAsync();
}
}