Question

我尝试为自己做一些最小化的应用程序，但选择的路径有点问题。我有以下代码：

  public partial class MainWindow : Window
{


    public MainWindow()
    {
        InitializeComponent();
    }               
    private void FilesCountNumberShow_button_Click(object sender, RoutedEventArgs e)
    {
        // Try to count nu,ber of files in folder
        int fCount = Directory.GetFiles(count_path, "*", SearchOption.TopDirectoryOnly).Length;
        FilesCountNumber_Label.Content = "Files in folder: " + fCount;


    }

    private void SelectFolderPath_button_Click(object sender, RoutedEventArgs e)
    {
        // These code is for open File Dialog and choose older path as count_path
        var SelectFolderPath_Dialog = new WinForms.FolderBrowserDialog();
        if (SelectFolderPath_Dialog.ShowDialog() == WinForms.DialogResult.OK)
        {
            string count_path = SelectFolderPath_Dialog.SelectedPath;
            MessageBox.Show(count_path);

        }

    }
}

}

如何在

中引用变量count_path

 int fCount = Directory.GetFiles(count_path, "*", SearchOption.TopDirectoryOnly).Length;

我掌握了不存在的信息（我认为SelectFolderPath_button_Click中的locla变量对吗？如何设置全局变量？

我这样做。我在此处添加string count_path { get; set; }：

 public partial class MainWindow : Window
{
     string count_path { get; set; }

    public MainWindow()
    {
        InitializeComponent();
    }

并修改

 private void SelectFolderPath_button_Click(object sender, RoutedEventArgs e)
    {
        var SelectFolderPath_Dialog = new WinForms.FolderBrowserDialog();
        if (SelectFolderPath_Dialog.ShowDialog() == WinForms.DialogResult.OK)
        {
            count_path = SelectFolderPath_Dialog.SelectedPath;

            MessageBox.Show(count_path);

        }

    }

这是一个好的解决方案，还是应该以其他方式解决？

Answer 1

将所选路径存储在私有字段中，并验证是否已设置它：

public partial class MainWindow : Window
{
    private string count_path;

    public MainWindow()
    {
        InitializeComponent();
    }

    private void FilesCountNumberShow_button_Click(object sender, RoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(count_path))
        {
            MessageBox.Show("You must select a folder first!");
        }
        else
        {
            // Try to count nu,ber of files in folder
            int fCount = Directory.GetFiles(count_path, "*", SearchOption.TopDirectoryOnly).Length;
            FilesCountNumber_Label.Content = "Files in folder: " + fCount;
        }
    }

    private void SelectFolderPath_button_Click(object sender, RoutedEventArgs e)
    {
        // These code is for open File Dialog and choose older path as count_path
        var SelectFolderPath_Dialog = new WinForms.FolderBrowserDialog();
        if (SelectFolderPath_Dialog.ShowDialog() == WinForms.DialogResult.OK)
        {
            count_path = SelectFolderPath_Dialog.SelectedPath;
            MessageBox.Show(count_path);
        }
    }
}

Answer 2

  //add assembly reference System.Windows.Forms
   private void SelectFolderPath_button_Click(object sender, RoutedEventArgs e)
      {
           using (var SelectFolderPath_Dialog = new   System.Windows.Forms.FolderBrowserDialog())
           {
                if (SelectFolderPath_Dialog.ShowDialog() ==   System.Windows.Forms.DialogResult.OK)
                   {
                       string count_path = SelectFolderPath_Dialog.SelectedPath;
                   MessageBox.Show(count_path);

              }
           }
          }

引用其他变量

2 个答案: