private async Task LoadFile(StorageFile file)
{
if (isCanceled)
{
return;
}
if (Utilities.IsSupportedFileType(file.FileType))
{
StorageItemContentProperties fileProperties = file.Properties;
MusicProperties musicProperties = await fileProperties.GetMusicPropertiesAsync();
IDictionary <string, object> artistProperties = await fileProperties.RetrievePropertiesAsync(RealMusicProperties);
object artists = null;
artistProperties.TryGetValue("System.Music.Artist", out artists);
string[] artistsAsArray = DebugHelper.CastAndAssert <string[]>(artists);
string artistName = string.Empty;
if (artistsAsArray != null && artistsAsArray.Length > 0)
{
artistName = artistsAsArray[0];
}
if (this.TrackScanned != null)
{
this.TrackScanned(this, new TrackScannedEventArgs(new StorageProviderSong(file.Path, musicProperties, artistName)));
}
}
}
// 通过 StorageFolder.Properties 的 RetrievePropertiesAsync() 方法获取文件的属性
private async Task ShowProperties3(StorageFile storageFile)
{
/*
* 获取文件的其它各种属性
* 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");
propertiesName.Add("System.FileAttributes");
StorageItemContentProperties storageItemContentProperties = storageFile.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;
lblMsg.Text += "System.FileAttributes：" + extraProperties["System.FileAttributes"];
lblMsg.Text += Environment.NewLine;
}
public async void GetOtherPropeties(StorageItemContentProperties properties)
{
string dateAccessedProperty = "System.DateAccessed";
string fileOwnerProperty = "System.FileOwner";
List <string> propertiesName = new List <string>();
propertiesName.Add(dateAccessedProperty);
propertiesName.Add(fileOwnerProperty);
IDictionary <string, object> extraProperties = await properties.RetrievePropertiesAsync(propertiesName);
ViewModel.ItemAccessedTimestamp = ListedItem.GetFriendlyDate((DateTimeOffset)extraProperties[dateAccessedProperty]);
ViewModel.ItemFileOwner = extraProperties[fileOwnerProperty].ToString();
}
public async void GetOtherProperties(StorageItemContentProperties properties)
{
string dateAccessedProperty = "System.DateAccessed";
List <string> propertiesName = new List <string>();
propertiesName.Add(dateAccessedProperty);
IDictionary <string, object> extraProperties = await properties.RetrievePropertiesAsync(propertiesName);
ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
string returnformat = Enum.Parse <TimeStyle>(localSettings.Values[Constants.LocalSettings.DateTimeFormat].ToString()) == TimeStyle.Application ? "D" : "g";
// Cannot get date and owner in MTP devices
ViewModel.ItemAccessedTimestamp = ((DateTimeOffset)(extraProperties[dateAccessedProperty] ?? DateTimeOffset.Now)).GetFriendlyDateFromFormat(returnformat);
}
public async void GetOtherProperties(StorageItemContentProperties properties)
{
string dateAccessedProperty = "System.DateAccessed";
string fileOwnerProperty = "System.FileOwner";
List <string> propertiesName = new List <string>();
propertiesName.Add(dateAccessedProperty);
propertiesName.Add(fileOwnerProperty);
IDictionary <string, object> extraProperties = await properties.RetrievePropertiesAsync(propertiesName);
// Cannot get date and owner in MTP devices
ViewModel.ItemAccessedTimestamp = ListedItem.GetFriendlyDate((DateTimeOffset)(extraProperties[dateAccessedProperty] ?? DateTimeOffset.Now));
if (App.AppSettings.ShowFileOwner)
{
// Cannot get date and owner in MTP devices
ViewModel.ItemFileOwner = extraProperties[fileOwnerProperty]?.ToString();
}
}
// 修改文件的属性
private async void btnModifyProperty_Click(object sender, Windows.UI.Xaml.RoutedEventArgs 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);
// 在 System.FileAttributes 中保存有文件是否是“只读”的信息
string[] retrieveList = new string[] { "System.FileAttributes" };
StorageItemContentProperties storageItemContentProperties = storageFile.Properties;
IDictionary <string, object> extraProperties = await storageItemContentProperties.RetrievePropertiesAsync(retrieveList);
uint FILE_ATTRIBUTES_READONLY = 1;
if (extraProperties != null && extraProperties.ContainsKey("System.FileAttributes"))
{
// 切换文件的只读属性
uint temp = (UInt32)extraProperties["System.FileAttributes"] ^ FILE_ATTRIBUTES_READONLY;
// 设置文件的只读属性为 true
// uint temp = (UInt32)extraProperties["System.FileAttributes"] | 1;
// 设置文件的只读属性为 false
// uint temp = (UInt32)extraProperties["System.FileAttributes"] & 0;
extraProperties["System.FileAttributes"] = temp;
}
else
{
// 设置文件的只读属性为 true
extraProperties = new PropertySet();
extraProperties.Add("System.FileAttributes", FILE_ATTRIBUTES_READONLY);
}
// 保存修改后的属性（用这种方法可以修改部分属性，大部分属性都是无权限修改的）
await storageFile.Properties.SavePropertiesAsync(extraProperties);
}
