How deeply does ASP.NET Core in Action, 3e cover event id?

Defines optional integer identifiers, examples, and the zero default, then demonstrates assignment through LoggerMessage.

Event id

As explained in ASP.NET Core in Action, 3e

EventId is a .NET logging value that identifies a category or kind of log event.

An EventId is an optional integer attached to a log entry. It helps you quickly find related events; when omitted, its value is 0. section 26.2

Choose distinct identifiers for recurring application events:

Use 1000 when a user loads a recipe that does not exist. section 26.2
Use 1001 when a user tries to access a recipe without permission. section 26.2

Event ID with generated logging

A LoggerMessage declaration can assign event ID 10 to an information-level message: [LoggerMessage(10, LogLevel.Information, "Loaded {RecipeCount} recipes")]. Calling the generated method records the event with that identifier.

How ASP.NET Core in Action, 3e covers it

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Also explained in

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Building Web APIs with ASP.NET CoreEventId is logging metadata that identifies the event associated with a log record and can contain values of different types.

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Related concepts

logused by · A log is a record of events, activity, or diagnostic information produced during the operation of a system or process, often ordered by time.
ILoggerProviderused by · ILoggerProvider is a .NET logging interface that creates logger instances associated with a logging destination or implementation.

This explainer was generated by Manning's knowledge graph from the text of ASP.NET Core in Action, 3e. The section links point to the parts of the book it draws on.