public override async Task TrimCacheAsync()
{
string directory = Path.GetDirectoryName(this.CachedPath);
if (directory != null)
{
DirectoryInfo directoryInfo = new DirectoryInfo(directory);
DirectoryInfo parentDirectoryInfo = directoryInfo.Parent;
if (parentDirectoryInfo != null)
{
// UNC folders can throw exceptions if the file doesn't exist.
foreach (DirectoryInfo enumerateDirectory in await parentDirectoryInfo.SafeEnumerateDirectoriesAsync())
{
IEnumerable<FileInfo> files = enumerateDirectory.EnumerateFiles().OrderBy(f => f.CreationTimeUtc);
int count = files.Count();
foreach (FileInfo fileInfo in files)
{
try
{
// If the group count is equal to the max count minus 1 then we know we
// have reduced the number of items below the maximum allowed.
// We'll cleanup any orphaned expired files though.
if (!this.IsExpired(fileInfo.CreationTimeUtc) && count <= MaxFilesCount - 1)
{
break;
}
// Remove from the cache and delete each CachedImage.
CacheIndexer.Remove(fileInfo.Name);
fileInfo.Delete();
count -= 1;
}
// ReSharper disable once EmptyGeneralCatchClause
catch
{
// Log it but skip to the next file.
ImageProcessorBootstrapper.Instance.Logger.Log<DiskCache>("Unable to clean cached file: " + fileInfo.FullName);
}
}
}
}
}
}