/// <summary>
/// 非同期で画像を読み込む
/// </summary>
/// <param name="folderPath"></param>
/// <returns></returns>
public async Task LoadVRCPhotoListAsync(string[] folderPaths, CancellationToken cancelToken)
{
_db.CreateDBCacheIfNeeded();
if (folderPaths.Any(f => !Directory.Exists(f)))
{
throw new DirectoryNotFoundException($"{string.Join(',',folderPaths.Where(f => !Directory.Exists(f)))} is not exist.");
}
Collection.Clear();
try
{
// UIスレッドと分離させる
await Task.Run(async() =>
{
var filePaths = folderPaths.SelectMany(f => Directory.GetFiles(f, "*.png", SearchOption.TopDirectoryOnly))
.Where(x => !x.StartsWith(AppCache.Instance.CacheFolderPath, StringComparison.Ordinal))
.ToList();
var metaSets = _db.GetVrcMetaDataIfExists(filePaths);
var photos = metaSets
.Select(m =>
new Photo(m.filePath)
{
MetaData = m.vrcMetaData
})
.ToList();
Collection.AddRangeOnScheduler(photos);
var tasks = filePaths
.Except(metaSets.Select(m => m.filePath))
.Select(fp =>
new Task(async() =>
{
var meta = await MetaDataHelper.GetVrcMetaDataAsync(fp, cancelToken).ConfigureAwait(true);
if (cancelToken.IsCancellationRequested)
{
return;
}
Collection.AddOnScheduler(
new Photo(fp)
{
MetaData = meta
});
try
{
await _db.InsertAsync(fp, meta, cancelToken).ConfigureAwait(false);
}
catch (InvalidOperationException e)
{
// A second operation started on this context before a previous operation completed. This is usually caused by different threads using the same instance of DbContext. For more information on how to avoid threading issues with DbContext, see https://go.microsoft.com/fwlink/?linkid=2097913.
// The instance of entity type 'Photo' cannot be tracked because another instance with the same key value for {'FilePath'} is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached. Consider using 'DbContextOptionsBuilder.EnableSensitiveDataLogging' to see the conflicting key values.
FileHelper.OutputErrorLogFile(e);
}
catch (ArgumentException e)
{
FileHelper.OutputErrorLogFile(e);
}
catch (Microsoft.EntityFrameworkCore.DbUpdateException e)
{
// An error occurred while updating the entries. See the inner exception for details.
FileHelper.OutputErrorLogFile(e);
}
catch (TaskCanceledException e) { }
}, cancelToken));
Debug.Print($"{tasks.Count()}/{filePaths.Count}");
foreach (var task in tasks)
{
if (cancelToken.IsCancellationRequested)
{
return;
}
task.Start();
}
}, cancelToken).ConfigureAwait(true);
_db.SaveChanges();
}
catch (Exception e)
{
Debug.Print($"{e.GetType().Name}: {e.Message}");
}
}
