Event id
An event ID is a value associated with an event that identifies the event or its type, or helps a system recognize whether it has already been processed.
Building Web APIs with ASP.NET Core
EventId is logging metadata that identifies the event associated with a log record and can contain values of different types.
- How it is used
- Classifies related log records so applications can group, filter, and audit controller or exception events.
- How deep it goes
- Defines event IDs, demonstrates logging overloads and centralized constants, then shows provider-specific display and structured storage.
- Examples
- Uses controller-operation constants, an exception identifier, console output, and a Serilog Properties entry containing EventId.
- What you can do after
- Operate/configure application logging with custom identifiers and inspect how providers display or persist those identifiers.
Read how Building Web APIs with ASP.NET Core explains event id →
ASP.NET Core in Action, 3e
EventId is a .NET logging value that identifies a category or kind of log event.
- How it is used
- Identifies similar log events so developers can find recurring errors quickly.
- How deep it goes
- Defines optional integer identifiers, examples, and the zero default, then demonstrates assignment through LoggerMessage.
- Examples
- Uses missing-recipe, unauthorized-recipe, and loaded-recipes events with identifiers 1000, 1001, and 10.
- What you can do after
- Diagnose/debug with it by grouping related log entries under consistent integer identifiers.
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.
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