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  • 背水一战 Windows 10 (86)

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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 - 文件夹操作类
     *     直接通过调用 Name, Path, DisplayName, DisplayType, FolderRelativeId, Provider, DateCreated, Attributes 获取相关属性,详见文档
     *     GetBasicPropertiesAsync() - 返回一个 BasicProperties 类型的对象 
     *     Properties - 返回一个 StorageItemContentProperties 类型的对象
     *
     * BasicProperties
     *     可以获取的数据有 Size, DateModified, ItemDate
     * 
     * StorageItemContentProperties
     *     通过调用 RetrievePropertiesAsync() 方法来获取指定的属性,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);
    
                // 显示文件夹的各种属性
                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() 方法获取文件夹的属性
            private async Task ShowProperties3(StorageFolder storageFolder)
            {
                /*
                 * 获取文件夹的其它各种属性
                 * 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:http://msdn.microsoft.com/en-us/library/windows/desktop/ff521735(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

    <Page
        x:Class="Windows10.FileSystem.FileThumbnail"
        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">
    
                <TextBlock Name="lblMsg" Margin="5" />
    
                <ListBox Name="listBox" Width="400" Height="200" HorizontalAlignment="Left" Margin="5" SelectionChanged="listBox_SelectionChanged" />
    
                <Image Name="imageThumbnail" Stretch="None" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="5" />
    
            </StackPanel>
        </Grid>
    </Page>

    FileSystem/FileThumbnail.xaml.cs

    /*
     * 演示如何获取文件的缩略图
     * 
     * StorageFile - 文件操作类。与获取文件缩略图相关的接口如下
     *     public IAsyncOperation<StorageItemThumbnail> GetThumbnailAsync(ThumbnailMode mode);
     *     public IAsyncOperation<StorageItemThumbnail> GetThumbnailAsync(ThumbnailMode mode, uint requestedSize);
     *     public IAsyncOperation<StorageItemThumbnail> GetThumbnailAsync(ThumbnailMode mode, uint requestedSize, ThumbnailOptions options);
     *         ThumbnailMode mode - 用于描述缩略图的目的,以使系统确定缩略图图像的调整方式(就用 SingleItem 即可)
     *         uint requestedSize - 期望尺寸的最长边长的大小
     *         ThumbnailOptions options - 检索和调整缩略图的行为(默认值:UseCurrentScale)
     *         
     * StorageItemThumbnail - 缩略图(实现了 IRandomAccessStream 接口,可以直接转换为 BitmapImage 对象)
     *     OriginalWidth - 缩略图的宽
     *     OriginalHeight - 缩略图的高
     *     Size - 缩略图的大小(单位:字节)
     */
    
    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.Media.Imaging;
    using Windows.UI.Xaml.Navigation;
    
    namespace Windows10.FileSystem
    {
        public sealed partial class FileThumbnail : Page
        {
            public FileThumbnail()
            {
                this.InitializeComponent();
            }
    
            protected async override void OnNavigatedTo(NavigationEventArgs e)
            {
                // 获取“图片库”目录下的所有根文件
                StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
                IReadOnlyList<StorageFile> fileList = await picturesFolder.GetFilesAsync();
                listBox.ItemsSource = fileList.Select(p => p.Name).ToList();
    
                base.OnNavigatedTo(e);
            }
    
            private async void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
            {
                // 用户选中的文件
                string fileName = (string)listBox.SelectedItem;
                StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
                StorageFile storageFile = await picturesFolder.GetFileAsync(fileName);
    
                // 显示文件的缩略图
                await ShowThumbnail(storageFile);
            }
    
            private async Task ShowThumbnail(StorageFile storageFile)
            {
                // 如果要获取文件的缩略图,就指定为 ThumbnailMode.SingleItem 即可
                ThumbnailMode thumbnailMode = ThumbnailMode.SingleItem;
                uint requestedSize = 200;
                ThumbnailOptions thumbnailOptions = ThumbnailOptions.UseCurrentScale;
    
                using (StorageItemThumbnail thumbnail = await storageFile.GetThumbnailAsync(thumbnailMode, requestedSize, thumbnailOptions))
                {
                    if (thumbnail != null)
                    {
                        BitmapImage bitmapImage = new BitmapImage();
                        bitmapImage.SetSource(thumbnail);
                        imageThumbnail.Source = bitmapImage;
    
                        lblMsg.Text = $"thumbnail1 requestedSize:{requestedSize}, returnedSize:{thumbnail.OriginalWidth}x{thumbnail.OriginalHeight}, size:{thumbnail.Size}";
                    }
                }
            }
        }
    }



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    [源码下载]

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  • 原文地址:https://www.cnblogs.com/webabcd/p/8286680.html
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