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Tag: filesystem

2 posts

2026-10-13 errors dotnet dotnet-10

Fix: FileInfo.Length returns a stale size for a file that is still being written on Windows

FileInfo caches its size, enumeration reads NTFS's lazily updated directory entry, and the writer may still hold bytes in its own buffers. Refresh(), or better, read the length from a shared handle with RandomAccess.GetLength.

2026-04-29 dotnet dotnet-11 filesystem

How to detect when a file finishes being written to in .NET

FileSystemWatcher fires Changed before the writer is done. Three reliable patterns for .NET 11 to know a file is fully written: open with FileShare.None, debounce with size stabilization, and the producer-side rename trick that avoids the problem entirely.