Topic 16. Working with files and streams, and serializing data to JSON

Goal: become familiar with the classes of the System.IO namespace and the System.Text.Json library; learn to work with files and directories, read and write text and binary files through streams, handle I/O exceptions, import CSV data, and serialize and deserialize objects to and from JSON with options and attributes.

Lecture contents

1. The file system and encoding — The file system in .NET · Text encoding
2. Streams and CSV format — Streams · CSV format
3. JSON and asynchronous operations — JSON and System.Text.Json · Asynchronous file operations
4. Examples and common mistakes — Example programs · Common mistakes

Practice and review

• Practice — 3 worked examples with complete code and output
• Tasks — 30 variants, each with tasks at three difficulty levels
• Summary — conclusions, self-check questions, and useful links