CompileTimeLogger

A Roslyn analyzer that detects ILogger.Log* method calls and provides code fixes to convert them to compile-time generated logging using the [LoggerMessage] attribute for better performance.

Why Use Compile-Time Logging?

The [LoggerMessage] attribute (introduced in .NET 6) enables source generation for high-performance logging:

• Zero allocations - No boxing of value types
• No parsing at runtime - Message templates are parsed at compile time
• Strongly typed - Compile-time validation of log message parameters
• Better performance - Up to 6x faster than traditional logging extensions

Installation

dotnet add package CompileTimeLogger

Or via Package Manager:

Install-Package CompileTimeLogger

Usage

The analyzer detects calls like:

_logger.LogInformation("User {UserId} logged in", userId);

And offers two code fixes:

Fix 1: Convert to Instance Method

// Before _logger.LogInformation("User {UserId} logged in", userId); // After LogUserLoggedIn(userId); [LoggerMessage(Level = LogLevel.Information, Message = "User {UserId} logged in")] private partial void LogUserLoggedIn(string userId);

Fix 2: Convert to Private Log Class

// Before _logger.LogInformation("User {UserId} logged in", userId); // After Log.UserLoggedIn(_logger, userId); private static partial class Log { [LoggerMessage(Level = LogLevel.Information, Message = "User {UserId} logged in")] public static partial void UserLoggedIn(ILogger logger, string userId); }