dotnet-file-io

File I/O patterns for .NET applications. Covers FileStream construction with async flags, RandomAccess API for thread-safe offset-based I/O, File convenience methods, FileSystemWatcher event handling and debouncing, MemoryMappedFile for large files and IPC, path handling security (Combine vs Join), secure temp file creation, cross-platform considerations, IOException hierarchy, and buffer sizing guidance.

Scope

• FileStream construction with async flags
• RandomAccess API for thread-safe offset-based I/O
• FileSystemWatcher event handling and debouncing
• MemoryMappedFile for large files and IPC
• Path handling security (Combine vs Join) and secure temp files

Out of scope

• PipeReader/PipeWriter and network I/O -- see [skill:dotnet-io-pipelines]
• Async/await fundamentals -- see [skill:dotnet-csharp-async-patterns]
• Span/Memory/ArrayPool deep patterns -- see [skill:dotnet-performance-patterns]
• JSON and Protobuf serialization -- see [skill:dotnet-serialization]
• GC implications of memory-mapped backing arrays -- see [skill:dotnet-gc-memory]