Project 3: File Logger

Build a File Logger

Practice file handling and exception handling together. You'll write a logger that saves timestamped messages to a file and reads them back.

YOUR TASK

Create a program that:

Writes 3 log messages to a file called log.txt using File.AppendAllText
Each message should include a prefix like [INFO] or [ERROR]
Reads the file back and prints all lines to the console
Wraps file operations in a try/catch block

Need a hint?

Key APIs:
1. Write: File.AppendAllText("log.txt", "[INFO] msg\n");
2. Read all lines: string[] lines = File.ReadAllLines("log.txt");
3. Wrap in: try { ... } catch (Exception e) { Console.WriteLine(e.Message); }
4. Add using System.IO; at the top

Expected output:

Log written successfully.
Reading log file...
[INFO] App started
[INFO] User logged in
[ERROR] Something went wrong

Language:

Input:

Code Editor Ready

Output

Console

Console initialized...
Ready for Project 3: File Logger

> Test your code with the "Check My Code" button
> When it passes, the Complete button will activate!