public virtual async Task DeleteAsync(MediaFile mediaFile)
{
Guard.NotNull(mediaFile, nameof(mediaFile));
var filter = string.Format("{0}*.*", mediaFile.Id.ToString(IdFormatString));
await foreach (var file in _fileSystem.EnumerateFilesAsync(_thumbsRootDir, filter, deep: true))
{
await _fileSystem.TryDeleteFileAsync(file.SubPath);
}
}