原文:背水一战 Windows 10 (86) - 文件系统: 获取文件夹的属性, 获取文件夹的缩略图
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背水一战 Windows 10 (86) - 文件系统: 获取文件夹的属性, 获取文件夹的缩略图
作者：webabcd
介绍
背水一战 Windows 10 之 文件系统
获取文件夹的属性
获取文件夹的缩略图
示例
1、演示如何获取文件夹的属性
FileSystem/FolderProperties.xaml
<Page x:Class="Windows10.FileSystem.FolderProperties" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Windows10.FileSystem" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <Grid Background="Transparent"> <StackPanel Margin="10 0 10 10"> <ListBox Name="listBox" Width="400" Height="200" HorizontalAlignment="Left" Margin="5" SelectionChanged="listBox_SelectionChanged" /> <TextBlock Name="lblMsg" Margin="5" /> </StackPanel> </Grid> </Page>
FileSystem/FolderProperties.xaml.cs
/* * 演示如何获取文件夹的属性 * * StorageFolder - 文件夹操纵类 * 直接通过挪用 Name, Path, DisplayName, DisplayType, FolderRelativeId, Provider, DateCreated, Attributes 获取相关属性，详见文档 * GetBasicPropertiesAsync() - 返回一个 BasicProperties 类型的东西 * Properties - 返回一个 StorageItemContentProperties 类型的东西 * * BasicProperties * 可以获取的数据有 Size, DateModified, ItemDate * * StorageItemContentProperties * 通过挪用 RetrievePropertiesAsync() 要领来获取指定的属性，详见下面的示例 */ using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using Windows.Storage; using Windows.Storage.FileProperties; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Navigation; namespace Windows10.FileSystem { public sealed partial class FolderProperties : Page { public FolderProperties() { this.InitializeComponent(); } protected async override void OnNavigatedTo(NavigationEventArgs e) { // 获取“图片库”目录下的所有根文件夹 StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary); IReadOnlyList<StorageFolder> folderList = await picturesFolder.GetFoldersAsync(); listBox.ItemsSource = folderList.Select(p => p.Name).ToList(); base.OnNavigatedTo(e); } private async void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { // 用户选中的文件夹 string folderName = (string)listBox.SelectedItem; StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary); StorageFolder storageFolder = await picturesFolder.GetFolderAsync(folderName); // 显示文件夹的各类属性 ShowProperties1(storageFolder); await ShowProperties2(storageFolder); await ShowProperties3(storageFolder); } // 通过 StorageFolder 获取文件夹的属性 private void ShowProperties1(StorageFolder storageFolder) { lblMsg.Text = "Name：" + storageFolder.Name; lblMsg.Text += Environment.NewLine; lblMsg.Text += "Path：" + storageFolder.Path; lblMsg.Text += Environment.NewLine; lblMsg.Text += "DisplayName：" + storageFolder.DisplayName; lblMsg.Text += Environment.NewLine; lblMsg.Text += "DisplayType：" + storageFolder.DisplayType; lblMsg.Text += Environment.NewLine; lblMsg.Text += "FolderRelativeId：" + storageFolder.FolderRelativeId; lblMsg.Text += Environment.NewLine; lblMsg.Text += "Provider：" + storageFolder.Provider; lblMsg.Text += Environment.NewLine; lblMsg.Text += "DateCreated：" + storageFolder.DateCreated; lblMsg.Text += Environment.NewLine; lblMsg.Text += "Attributes：" + storageFolder.Attributes; // 返回一个 FileAttributes 类型的枚举（FlagsAttribute），可以从中获知文件夹是否是 ReadOnly 之类的信息 lblMsg.Text += Environment.NewLine; } // 通过 StorageFolder.GetBasicPropertiesAsync() 获取文件夹的属性 private async Task ShowProperties2(StorageFolder storageFolder) { BasicProperties basicProperties = await storageFolder.GetBasicPropertiesAsync(); lblMsg.Text += "Size：" + basicProperties.Size; lblMsg.Text += Environment.NewLine; lblMsg.Text += "DateModified：" + basicProperties.DateModified; lblMsg.Text += Environment.NewLine; lblMsg.Text += "ItemDate：" + basicProperties.ItemDate; lblMsg.Text += Environment.NewLine; } // 通过 StorageFolder.Properties 的 RetrievePropertiesAsync() 要领获取文件夹的属性 private async Task ShowProperties3(StorageFolder storageFolder) { /* * 获取文件夹的其它各类属性 * 详细的属性列表请参见结尾处的“附录一: 属性列表”或者参见：(v=vs.85).aspx */ List<string> propertiesName = new List<string>(); propertiesName.Add("System.DateAccessed"); propertiesName.Add("System.DateCreated"); propertiesName.Add("System.FileOwner"); StorageItemContentProperties storageItemContentProperties = storageFolder.Properties; IDictionary<string, object> extraProperties = await storageItemContentProperties.RetrievePropertiesAsync(propertiesName); lblMsg.Text += "System.DateAccessed：" + extraProperties["System.DateAccessed"]; lblMsg.Text += Environment.NewLine; lblMsg.Text += "System.DateCreated：" + extraProperties["System.DateCreated"]; lblMsg.Text += Environment.NewLine; lblMsg.Text += "System.FileOwner：" + extraProperties["System.FileOwner"]; lblMsg.Text += Environment.NewLine; } } } /* ---------------------------------------------------------------------- 附录一: 属性列表 System.AcquisitionID System.ApplicationName System.Author System.Capacity System.Category System.Comment System.Company System.ComputerName System.ContainedItems System.ContentStatus System.ContentType System.Copyright System.DataObjectFormat System.DateAccessed System.DateAcquired System.DateArchived System.DateCompleted System.DateCreated System.DateImported System.DateModified System.DefaultSaveLocationIconDisplay System.DueDate System.EndDate System.FileAllocationSize System.FileAttributes System.FileCount System.FileDescription System.FileExtension System.FileFRN System.FileName System.FileOwner System.FileVersion System.FindData System.FlagColor System.FlagColorText System.FlagStatus System.FlagStatusText System.FreeSpace System.FullText System.Identity System.Identity.Blob System.Identity.DisplayName System.Identity.IsMeIdentity System.Identity.PrimaryEmailAddress System.Identity.ProviderID System.Identity.UniqueID System.Identity.UserName System.IdentityProvider.Name System.IdentityProvider.Picture System.ImageParsingName System.Importance System.ImportanceText System.IsAttachment System.IsDefaultNonOwnerSaveLocation System.IsDefaultSaveLocation System.IsDeleted System.IsEncrypted System.IsFlagged System.IsFlaggedComplete System.IsIncomplete System.IsLocationSupported System.IsPinnedToNameSpaceTree System.IsRead System.IsSearchOnlyItem System.IsSendToTarget System.IsShared System.ItemAuthors System.ItemClassType System.ItemDate System.ItemFolderNameDisplay System.ItemFolderPathDisplay System.ItemFolderPathDisplayNarrow System.ItemName System.ItemNameDisplay System.ItemNamePrefix System.ItemParticipants System.ItemPathDisplay System.ItemPathDisplayNarrow System.ItemType System.ItemTypeText System.ItemUrl System.Keywords System.Kind System.KindText System.Language System.LayoutPattern.ContentViewModeForBrowse System.LayoutPattern.ContentViewModeForSearch System.LibraryLocationsCount System.MileageInformation System.MIMEType System.Null System.OfflineAvailability System.OfflineStatus System.OriginalFileName System.OwnerSID System.ParentalRating System.ParentalRatingReason System.ParentalRatingsOrganization System.ParsingBindContext System.ParsingName System.ParsingPath System.PerceivedType System.PercentFull System.Priority System.PriorityText System.Project System.ProviderItemID System.Rating System.RatingText System.Sensitivity System.SensitivityText System.SFGAOFlags System.SharedWith System.ShareUserRating System.SharingStatus System.Shell.OmitFromView System.SimpleRating System.Size System.SoftwareUsed System.SourceItem System.StartDate System.Status System.StatusBarSelectedItemCount System.StatusBarViewItemCount System.Subject System.Thumbnail System.ThumbnailCacheId System.ThumbnailStream System.Title System.TotalFileSize System.Trademarks ---------------------------------------------------------------------- */
2、演示如何获取文件的缩略图
FileSystem/FileThumbnail.xaml