What is source generated logging in .NET?

It's a compiler feature using `[LoggerMessage]` attributes to generate optimized log methods that skip work if the level's disabled—no strings, no allocations.

Does .NET source generated logging really allocate zero bytes?

Yes, when disabled: 1.5ns, 0B. Even enabled, it's allocation-free for the log call itself.

Should I replace all my .NET log statements with source gen?

For hot paths, absolutely—especially high-volume or disabled levels. Start with frequent ones; it'll pay off fast.

🤖 AI Dev Tools

.NET Logging's Zero-Alloc Hero: Source Gen Crushes the Competition

Picture your .NET API swallowing 10,000 log calls per second without a hiccup—no garbage collection frenzy, no stutters. Source-generated logging makes it real.

DevTools Feed Apr 03, 2026 3 min read

Benchmark table comparing .NET logging styles: source gen at 1.5ns with zero bytes allocated

⚡ Key Takeaways

Source-generated logging achieves 0B allocations and 1.5ns when disabled—60x faster than interpolation. 𝕏
Ditch string interpolation; it builds full strings before level checks, wasting cycles. 𝕏
Adopt [LoggerMessage] now: .NET team uses it internally for ultimate perf. 𝕏

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#.NET logging #.NET performance #BenchmarkDotNet #logging benchmarks #source generators

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