private CachedDirectoryInfo WatchOnDirectory(string directory, string fileMask, Action onChangeAction)
{
lock (directoryInfo)
{
var cacheRecord = directoryInfo[directory];
if (cacheRecord == null)
{
cacheRecord = new CachedDirectoryInfo
{
FileSystemWatcher = new FileSystemWatcher(directory, fileMask)
{
IncludeSubdirectories = true,
},
OnChange = onChangeAction
};
cacheRecord.FileSystemWatcher.Created += (a, b) => OnFileChanged(cacheRecord);
cacheRecord.FileSystemWatcher.Changed += (a, b) => OnFileChanged(cacheRecord);
cacheRecord.FileSystemWatcher.Deleted += (a, b) => OnFileChanged(cacheRecord);
cacheRecord.FileSystemWatcher.Renamed += (a, b) => OnFileChanged(cacheRecord);
cacheRecord.FileSystemWatcher.EnableRaisingEvents = true;
directoryInfo[directory] = cacheRecord;
}
return(cacheRecord);
}
}
private DateTime GetCachedFolderLastUpdateDateUtc(string directory, string fileMask)
{
var cacheRecord = _directoryInfo[directory];
if (cacheRecord == null)
{
lock (_directoryInfo)
{
cacheRecord = _directoryInfo[directory];
if (cacheRecord == null)
{
cacheRecord = new CachedDirectoryInfo();
cacheRecord.FileSystemWatcher = new FileSystemWatcher(directory, fileMask);
cacheRecord.FileSystemWatcher.IncludeSubdirectories = true;
cacheRecord.FileSystemWatcher.Created += (a, b) => cacheRecord.LastTimeUpdatedUtc = null;
cacheRecord.FileSystemWatcher.Changed += (a, b) => cacheRecord.LastTimeUpdatedUtc = null;
cacheRecord.FileSystemWatcher.Deleted += (a, b) => cacheRecord.LastTimeUpdatedUtc = null;
cacheRecord.FileSystemWatcher.Renamed += (a, b) => cacheRecord.LastTimeUpdatedUtc = null;
cacheRecord.FileSystemWatcher.EnableRaisingEvents = true;
_directoryInfo[directory] = cacheRecord;
}
}
}
var cachedResult = cacheRecord.LastTimeUpdatedUtc;
if (cachedResult.HasValue)
{
return(cachedResult.Value);
}
var files = Directory.GetFiles(directory, fileMask, SearchOption.AllDirectories);
if (files.Length == 0)
{
return(DateTime.Now);
}
DateTime result = File.GetLastWriteTimeUtc(files[0]);
foreach (var file in files.Skip(1))
{
DateTime lastUpdatedUtc = File.GetLastWriteTimeUtc(file);
if (lastUpdatedUtc > result)
{
result = lastUpdatedUtc;
}
}
cacheRecord.LastTimeUpdatedUtc = result;
return(result);
}
private DateTime GetCachedFolderLastUpdateDateUtc(string directory, string fileMask)
{
var cacheRecord = _directoryInfo[directory];
if (cacheRecord == null)
{
lock (_directoryInfo)
{
cacheRecord = _directoryInfo[directory];
if (cacheRecord == null)
{
cacheRecord = new CachedDirectoryInfo();
cacheRecord.FileSystemWatcher = new FileSystemWatcher(directory, fileMask);
cacheRecord.FileSystemWatcher.IncludeSubdirectories = true;
cacheRecord.FileSystemWatcher.Created += (a, b) => cacheRecord.LastTimeUpdatedUtc = null;
cacheRecord.FileSystemWatcher.Changed += (a, b) => cacheRecord.LastTimeUpdatedUtc = null;
cacheRecord.FileSystemWatcher.Deleted += (a, b) => cacheRecord.LastTimeUpdatedUtc = null;
cacheRecord.FileSystemWatcher.Renamed += (a, b) => cacheRecord.LastTimeUpdatedUtc = null;
cacheRecord.FileSystemWatcher.EnableRaisingEvents = true;
_directoryInfo[directory] = cacheRecord;
}
}
}
var cachedResult = cacheRecord.LastTimeUpdatedUtc;
if (cachedResult.HasValue) return cachedResult.Value;
var files = Directory.GetFiles(directory, fileMask, SearchOption.AllDirectories);
if (files.Length == 0) return DateTime.Now;
DateTime result = File.GetLastWriteTimeUtc(files[0]);
foreach (var file in files.Skip(1))
{
DateTime lastUpdatedUtc = File.GetLastWriteTimeUtc(file);
if (lastUpdatedUtc > result)
{
result = lastUpdatedUtc;
}
}
cacheRecord.LastTimeUpdatedUtc = result;
return result;
}
private void OnFileChanged(CachedDirectoryInfo cachedDirectoryInfo)
{
cachedDirectoryInfo.LastTimeUpdatedUtc = DateTime.Now;
cachedDirectoryInfo.OnChange?.Invoke();
}
