void UpdateReadStats(string filename, int byteCount)
{
FileSystemStats stats = GetStatsForExtension(filename);
stats.FilesRead += 1;
stats.BytesRead += byteCount;
}
FileSystemStats GetStatsForExtension(string filename)
{
string extension = Path.GetExtension(filename);
FileSystemStats stats;
if (!StatsByExtension.TryGetValue(extension, out stats))
{
stats = new FileSystemStats();
StatsByExtension[extension] = stats;
}
return(stats);
}