I Benchmarked 3 Ways to Log in .NET : One Allocates Nothing

The article discusses the evolution of logging in .NET and introduces a new feature called [LoggerMessage] attribute, which is designed to optimize performance by eliminating unnecessary allocations. Here are the key points:

1. Performance Optimization:

   • Traditional logging methods like logger.LogInformation($"Charging {amount:C} for payment {paymentId}") involve string interpolation, leading to memory allocation and garbage collection overhead.
   • The [LoggerMessage] attribute allows developers to define log messages with placeholders that are compiled into efficient code. This eliminates the need for runtime allocations.

2. Usage Example:

   csharp
    
   1[LoggerMessage(Level = LogLevel.Information, Message = "Charging {Amount} for payment {PaymentId}")]
   2private partial void LogCharging(Guid paymentId, decimal amount);

   • The attribute specifies the log level and message format.
   • A corresponding method is generated to handle logging with minimal overhead.

3. Comparison:

   • Traditional string interpolation: logger.LogInformation($"Charging {amount:C} for payment {paymentId}")
     • Inefficient due to runtime allocations.

   • [LoggerMessage] approach: LogCharging(paymentId, amount)

Read the full article at DEV Community

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