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Specifically, EF includes: A Log property for the context similar to DataContext.Log in LINQ to SQL. EF Core also allows manually managing transactions. This is most commonly used for logging SQL, but can also be used to modify or abort the command. That command internally creates a transaction and applies all changes to the database in a single call. Public override void CommandFailed ( DbCommand command, CommandErrorEventData eventData ) Appendix 1: What types of operations can you intercept? NET 6: EF logging is enabled by default in development. Starting with Entity Framework 6, anytime Entity Framework sends a command to the database this command can be intercepted by application code. How do I use query interception in Entity Framework Core?ĮF Core exposes a base class DbCommandInterceptor with hooks into the query “life cycle”.Ĭreate a class that extends DbCommandInterceptor Log a warning when the number of rows read into memory is above a certain threshold.Log diagnostic information when a query fails with an exception.

Each of these is tailored to different situations, and it is important to select the best mechanism for the task in hand, even when multiple mechanisms could work. Extend the timeout of a command that has certain charateristics Entity Framework Core (EF Core) contains several mechanisms for generating logs, responding to events, and obtaining diagnostics.There are a variety of real world use cases for this feature: Query interception is the ability to insert logic before a query executes on the database or insert logic immediately after a query executes (and before control returns to the calling code). info: 10403 Entity Framework Core 3.0.0-preview6.19304.10 initialized ConsolidatorsContext using provider with options: None. This is a summary of what I learned about the feature and is attempting to be the blog post that I wish I would have found during my investigation. Although this is a heavily used feature internally, I found literally two paragraphs of information about the feature in Entity Framework Core. To decide which features should stay / go, we needed to evaluate how compatible Entity Framework Core features were with our abstractions initially built on Entity Framework’s APIs. Query interception in Entity Framework CoreĪt work, my team is decoupling our NuGet libraries from Entity Framework to enable consumers to switch to Entity Framework Core.