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public SetPropertyPrefetch ( [ options, [ |
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| options | [ | |
| propertiesToRetrieve | [ |
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| return | void | |
private async void Find_Click(object sender, RoutedEventArgs e)
{
ContentTextOutput.Text = "";
List <string> propertyNames = new List <string>();
propertyNames.Add("System.FileName");
var queryOptions = new Windows.Storage.Search.QueryOptions();
queryOptions.IndexerOption = Windows.Storage.Search.IndexerOption.OnlyUseIndexer;
queryOptions.UserSearchFilter = FindQueryText.Text;
queryOptions.SetPropertyPrefetch(Windows.Storage.FileProperties.PropertyPrefetchOptions.DocumentProperties, propertyNames);
// Query the Pictures library.
StorageFileQueryResult queryResult = Windows.Storage.KnownFolders.PicturesLibrary.CreateFileQueryWithOptions(queryOptions);
IReadOnlyList <StorageFile> files = await queryResult.GetFilesAsync();
foreach (StorageFile file in files)
{
IDictionary <String, IReadOnlyList <Windows.Data.Text.TextSegment> > fileRangeProperties = queryResult.GetMatchingPropertiesWithRanges(file);
if (fileRangeProperties.ContainsKey("System.FileName"))
{
IReadOnlyList <Windows.Data.Text.TextSegment> ranges;
fileRangeProperties.TryGetValue("System.FileName", out ranges);
rootPage.HighlightRanges(ContentTextOutput, file.DisplayName, ranges);
}
// Note: You can continue looking for other properties you would like to highlight on the file here.
}
if (files.Count == 0)
{
ContentTextOutput.Text = "There were no matching files in your Pictures Library";
}
}
private async void Find_Click(object sender, RoutedEventArgs e)
{
ContentTextOutput.Text = "";
List<string> propertyNames = new List<string>();
propertyNames.Add("System.FileName");
var queryOptions = new Windows.Storage.Search.QueryOptions();
queryOptions.IndexerOption = Windows.Storage.Search.IndexerOption.OnlyUseIndexer;
queryOptions.UserSearchFilter = FindQueryText.Text;
queryOptions.SetPropertyPrefetch(Windows.Storage.FileProperties.PropertyPrefetchOptions.DocumentProperties, propertyNames);
// Query the Pictures library.
StorageFileQueryResult queryResult = Windows.Storage.KnownFolders.PicturesLibrary.CreateFileQueryWithOptions(queryOptions);
IReadOnlyList<StorageFile> files = await queryResult.GetFilesAsync();
foreach (StorageFile file in files)
{
IDictionary<String, IReadOnlyList<Windows.Data.Text.TextSegment>> fileRangeProperties = queryResult.GetMatchingPropertiesWithRanges(file);
if (fileRangeProperties.ContainsKey("System.FileName"))
{
IReadOnlyList<Windows.Data.Text.TextSegment> ranges;
fileRangeProperties.TryGetValue("System.FileName", out ranges);
rootPage.HighlightRanges(ContentTextOutput, file.DisplayName, ranges);
}
// Note: You can continue looking for other properties you would like to highlight on the file here.
}
if (files.Count == 0)
{
ContentTextOutput.Text = "There were no matching files in your Pictures Library";
}
}
private async void GetFilesButton_Click(object sender, RoutedEventArgs e)
{
// Reset output.
OutputPanel.Children.Clear();
// Set up file type filter.
List<string> fileTypeFilter = new List<string>();
fileTypeFilter.Add(".jpg");
fileTypeFilter.Add(".png");
fileTypeFilter.Add(".bmp");
fileTypeFilter.Add(".gif");
// Create query options.
var queryOptions = new QueryOptions(CommonFileQuery.OrderByName, fileTypeFilter);
// Set up property prefetch - use the PropertyPrefetchOptions for top-level properties
// and a list for additional properties.
List<string> propertyNames = new List<string>();
propertyNames.Add(CopyrightProperty);
propertyNames.Add(ColorSpaceProperty);
queryOptions.SetPropertyPrefetch(PropertyPrefetchOptions.ImageProperties, propertyNames);
// Set up thumbnail prefetch if needed, e.g. when creating a picture gallery view.
/*
const uint requestedSize = 190;
const ThumbnailMode thumbnailMode = ThumbnailMode.PicturesView;
const ThumbnailOptions thumbnailOptions = ThumbnailOptions.UseCurrentScale;
queryOptions.SetThumbnailPrefetch(thumbnailMode, requestedSize, thumbnailOptions);
*/
// Set up the query and retrieve files.
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
var query = picturesFolder.CreateFileQueryWithOptions(queryOptions);
IReadOnlyList<StorageFile> fileList = await query.GetFilesAsync();
foreach (StorageFile file in fileList)
{
OutputPanel.Children.Add(CreateHeaderTextBlock(file.Name));
// GetImagePropertiesAsync will return synchronously when prefetching has been able to
// retrieve the properties in advance.
var properties = await file.Properties.GetImagePropertiesAsync();
OutputPanel.Children.Add(CreateLineItemTextBlock("Dimensions: " + properties.Width + "x" + properties.Height));
// Similarly, extra properties are retrieved asynchronously but may
// return immediately when prefetching has fulfilled its task.
IDictionary<string, object> extraProperties = await file.Properties.RetrievePropertiesAsync(propertyNames);
var propValue = extraProperties[CopyrightProperty];
OutputPanel.Children.Add(CreateLineItemTextBlock("Copyright: " + GetPropertyDisplayValue(propValue)));
propValue = extraProperties[ColorSpaceProperty];
OutputPanel.Children.Add(CreateLineItemTextBlock("Color space: " + GetPropertyDisplayValue(propValue)));
// Thumbnails can also be retrieved and used.
// var thumbnail = await file.GetThumbnailAsync(thumbnailMode, requestedSize, thumbnailOptions);
}
}
