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Added generic source-generated logger methods to What's new in .Net 11 #55740

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Added generic source-generated logger methods to What's new in .Net 11 #55740

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01563d1
Document generic logging methods in .NET 11
svick Aug 26, 2026
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Merge branch 'main' into generic-logger-message-dotnet-11
gewarren Aug 27, 2026
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gewarren Aug 27, 2026
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14 changes: 12 additions & 2 deletions docs/core/whats-new/dotnet-11/libraries.md
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title: What's new in .NET libraries for .NET 11
description: Learn about the updates to the .NET libraries for .NET 11.
titleSuffix: ""
ms.date: 08/12/2026
ms.date: 08/25/2026
ai-usage: ai-assisted
ms.update-cycle: 3650-days
---
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These constants can be used with the `StringSyntax` attribute to provide better tooling support for string literals containing code in these languages.

## Caching and configuration
## Caching, configuration, and logging

- [Configuration binding](#configuration-binding)
- [MemoryCache OpenTelemetry metrics](#memorycache-opentelemetry-metrics)
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- [Options-aware HybridCache factories](#options-aware-hybridcache-factories)
- [Asynchronous validation with DataAnnotations](#asynchronous-validation-with-dataannotations)
- [Activity tracing configuration](#activity-tracing-configuration)
- [Generic source-generated logging methods](#generic-source-generated-logging-methods)
- [Improved reliability for configuration file change detection](#improved-reliability-for-configuration-file-change-detection)

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### Configuration binding

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The same release adds `ActivitySourceFactory` and unseals `ActivitySource`, which together support factory-driven creation and refreshable listeners.

### Generic source-generated logging methods

The logging source generator now supports generic methods decorated with <xref:Microsoft.Extensions.Logging.LoggerMessageAttribute>, primarily to avoid boxing. Generic type parameters can use standard constraints, such as `class`, `struct`, `unmanaged`, interfaces, base types, and `new()`. The `allows ref struct` anti-constraint isn't supported and produces [SYSLIB1011](../../../fundamentals/syslib-diagnostics/syslib1011.md).

```csharp
[LoggerMessage(0, LogLevel.Trace, "Received {Code} ({Length} bytes)")]
public static partial void PacketReceived<TCode>(ILogger logger, TCode code, int length)
where TCode : struct, Enum;
### Improved reliability for configuration file change detection

The <xref:Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher> type, which configuration providers use to detect configuration file changes, includes several reliability improvements.
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