A lightweight Windows Forms log viewer for .NET 10 that parses plain-text `.log` files produced by simple prefix-based logging (levels like `info:`, `dbug:`, `warn:`, `fail:`). It supports drag-and-drop, folder scanning for recent logs, level filtering, text search, and shows multi-line descriptions for each log entry.

In current version there are this feature:

Multiple File Support
Drag & Drop File Support
Filters Available
Search Support

Key features

Parse .log files with entries that start with a level prefix (case-insensitive): info:, dbug:, warn:, fail:.
Multi-line message support subsequent lines are appended to the previous entry’s description.
Non-blocking parsing file I/O and parsing run on a background thread; UI remains responsive.
Filter by level using checkboxes (Debug, Info, Warn, Fail).
Free-text search across Title and Description.
List recent .log files from a selected folder and open them.
Row coloring in the grid by level (Fail = red, Warn = orange, Info = light blue, others = light gray).
Click or navigate to a grid cell to view the full value in the result text box.
Virtual-mode DataGridView for very large logs (feeds rows from an in-memory List<LogEntry> and an index map for filtered views).
Keyboard shortcuts and accessibility improvements:
Ctrl+F focuses the search box and selects its text.
Esc clears the search box (if populated) and focuses the results grid.
AccessibleName properties set for key controls to improve screen-reader support.

Built With - Dotnet Core 10 - VS 2026 WinForm

Changelog

Version 2.0.0

net core version update and performance improvement

Version 1.0.0

Init release

DotNet Core Log Viewer