private static async Task <IList <FileListRecord> > ReadFromDevice(string path)
{
if (!File.Exists(path))
{
return(new List <FileListRecord>());
}
await fileLock.WaitAsync();
try
{
IList <FileListRecord> records = new List <FileListRecord>();
FileListRecord record = new FileListRecord();
using (var fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
using (var sr = new StreamReader(fs))
using (var tr = new CsvReader(sr, System.Globalization.CultureInfo.InvariantCulture))
{
var en = tr.EnumerateRecordsAsync <FileListRecord>(record).GetAsyncEnumerator();
while (await en.MoveNextAsync())
{
records.Add(en.Current);
}
await en.DisposeAsync();
}
return(records);
}
catch
{
return(null);
}
finally
{
fileLock.Release();
}
}
private static async Task UpdateFileListData(IList <FileListRecord> items)
{
for (int i = items.Count - 1; i >= 0; i--)
{
FileListRecord item = items[i];
FileSystemInfo fsi = null;
bool isFile = false;
if (isFile = File.Exists(item.Filename))
{
fsi = await Utils.CatchAsync <FileInfo, UnauthorizedAccessException>(() => new FileInfo(item.Filename));
}
else if (Directory.Exists(item.Filename))
{
fsi = await Utils.CatchAsync <DirectoryInfo, UnauthorizedAccessException>(() => new DirectoryInfo(item.Filename));
}
if (fsi is null)
{
items.RemoveAt(i);
}
else
{
if (isFile)
{
item.Size = ((FileInfo)fsi).Length;
}
item.DateModified = fsi.LastWriteTime.Ticks;
item.DateCreated = fsi.CreationTime.Ticks;
item.Attributes = (int?)fsi.Attributes;
}
}
}
