c# - 通用应用程序文件夹选择器 System.Runtime.InteropServices.COMException

Question

我正在尝试制作一个通用应用程序，它只打开一个文件夹(如快捷方式)但允许使用自定义颜色和更大图标的新开始磁贴设计。

当我打开 FolderPicker 以授予应用程序访问目录的权限时，出现错误，我不知道为什么。

System.Runtime.InteropServices.COMException

请协助。

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading.Tasks;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.Storage.AccessCache;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409

namespace App1
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();


            doPickFile();
            //Application.Current.Exit();
        }

        private async void doPickFile()
        {

            bool folderAdded = StorageApplicationPermissions.FutureAccessList.ContainsItem("\\\\server\\share$");

            if (!folderAdded)
            {
                var openPicker = new FolderPicker() { SuggestedStartLocation = PickerLocationId.PicturesLibrary  };
                StorageFolder folder = await openPicker.PickSingleFolderAsync();
                if (folder.Path == "\\\\server\\share$")
                {
                    StorageApplicationPermissions.FutureAccessList.AddOrReplace("PickedFolderToken", folder);
                }
            }
            else
            {
                StorageFolder pickedFolder = await StorageApplicationPermissions.FutureAccessList.GetFolderAsync("\\\\server\\share$");
                await Windows.System.Launcher.LaunchFolderAsync(pickedFolder);
            }
        }
    }
}

具体而言，调试器停在以下行: StorageFolder folder = await openPicker.PickSingleFolderAsync();

Answer 1

您必须添加一个 FileTypeFilter。

    var openPicker = new FolderPicker() { SuggestedStartLocation = PickerLocationId.PicturesLibrary }; 
    openPicker.FileTypeFilter.Add("*");
    StorageFolder folder = await openPicker.PickSingleFolderAsync();

还有一个 official Microsoft sample这表明了这一点。

奇怪的是:您还可以使用 FileTypeFilter.Add(".anytext") 而不是 FileTypeFilter.Add("*")，因为当前的 FolderPicker在 Windows 中实际上并不过滤文件类型。因此我无法解释为什么你必须这样做。