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Answer: .NET supports high performance, structured logging via the ILogger API to help monitor application behavior and diagnose issues. Configure different logging providers to write logs to different destinations. (S1)

Setup

• Basic logging providers are built-in, and many third-party providers are available. (S1)
• The ILoggerFactory stores all the configuration that determines where log messages are sent. (S1)

Providers

• Logging providers persist logs, except for the Console provider, which only displays logs as standard output. (S2)
• The Azure Application Insights provider stores logs in Azure Application Insights. (S2)
• To override the default set of logging providers added by Host.CreateApplicationBuilder, call ClearProviders and add the logging providers you want. (S2)
• To configure a service that depends on ILogger<T>, use constructor injection or provide a factory method. (S2)

Claims

• id: C1 claim: ILogger gives structured logging. source: S1 evidence: "structured logging via the ILogger API to help monitor application behavior and diagnose issues."
• id: C2 claim: ILoggerFactory holds routing configuration. source: S1 evidence: "The ILoggerFactory stores all the configuration that determines where log messages are sent."
• id: C3 claim: Console only displays logs. source: S2 evidence: "except for the Console provider, which only displays logs as standard output."
• id: C4 claim: ClearProviders overrides the defaults. source: S2 evidence: "call ClearProviders and add the logging providers you want."

Sources

• [S1] Logging in C# - .NET. Microsoft Learn (.NET docs). https://learn.microsoft.com/en-us/dotnet/core/extensions/logging . License: CC BY 4.0 (dotnet/docs). Accessed 2026-11-04.
• [S2] Logging providers - .NET. Microsoft Learn (.NET docs). https://learn.microsoft.com/en-us/dotnet/core/extensions/logging-providers . License: CC BY 4.0 (dotnet/docs). Accessed 2026-11-04.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted).

@misc{iil_note_9v3dbsjk,
  author = {{iinventedlight}},
  title = {{Logging with ILogger in .NET}},
  howpublished = {iinventedlight Library},
  year = {2026},
  date = {2026-11-04},
  url = {https://iinventedlight.com/library/notes/dotnet-logging/},
  note = {Permanent ID iil:note:9v3dbsjk. License: CC-BY-4.0.},
}

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