private IEnumerable <FileTreeItem> ProcessFileInfos(FileTreeItem parent, IEnumerable <FileSystemInfo> infos)
{
foreach (var subInfo in infos)
{
var subItem = new FileTreeItem(parent, subInfo);
parent.Items.Add(subItem);
yield return(subItem);
}
}
public FileTree CreateFileTree(DirectoryInfo root, CancellationToken cancellationToken = default)
{
var queue = new Queue <FileTreeItem>();
if (!root.Exists)
{
return(FileTree.Empty);
}
var rootItem = new FileTreeItem(null, root);
queue.Enqueue(rootItem);
var oldestFileTimestamp = DateTime.MaxValue;
var newestFileTimestamp = DateTime.MinValue;
var options = new EnumerationOptions
{
IgnoreInaccessible = true
};
while (queue.TryDequeue(out var parentItem))
{
if (cancellationToken.IsCancellationRequested)
{
break;
}
oldestFileTimestamp = oldestFileTimestamp > parentItem.Info.LastWriteTime ? parentItem.Info.LastWriteTime : oldestFileTimestamp;
newestFileTimestamp = newestFileTimestamp < parentItem.Info.LastWriteTime ? parentItem.Info.LastWriteTime : newestFileTimestamp;
if (parentItem.Info is DirectoryInfo directoryInfo)
{
try
{
var items = ProcessFileInfos(parentItem, directoryInfo.EnumerateFileSystemInfos("*", options));
foreach (var item in items)
{
queue.Enqueue(item);
}
}
catch (IOException)
{
// ignored
}
}
}
return(new FileTree(rootItem, oldestFileTimestamp, newestFileTimestamp));
}