如何验证，只允许用户选择1个文件来阅读？

Question

以下是允许用户阅读文件的代码。如何让用户只选择1个文件来阅读？

private void button3_Click(object sender, RoutedEventArgs e)
            {

                ViewDiskModel model = this.ContentPanel.DataContext as ViewDiskModel;
                if (model.Files.Any(file => file.IsChecked))
                {
                    model.ReadSelectedFiles.Execute(null);


                    NavigationService.Navigate(new Uri("/AnswerQuestionPage.xaml", UriKind.Relative));
                }
                else
                    if ((model.Files.Any(file => file.IsChecked)) > 1)
                {
                    MessageBox.Show("Please Select only 1 File.");
                }
            }

Answer 1

将model.Files.Any(file => file.IsChecked)替换为model.Files.Count(file => file.IsChecked) == 1。