ef-core-patterns

name: ef-core-patterns description: Entity Framework Core best practices for configuration, queries, concurrency, and multi-tenancy.

Entity Framework Core Best Practices

Use when configuring entities, optimizing queries, or implementing multi-tenant data access with EF Core.

When to use

• Configuring entity mappings, indexes, relationships, and value objects
• Optimizing read queries (AsNoTracking, projections) or preventing N+1 problems
• Adding row version concurrency tokens or handling conflicts
• Applying global tenant filters or implementing repositories

Core principles

• Prefer Fluent API over data annotations; keep entities clean with private setters
• Use AsNoTracking for reads; Include/split queries to avoid N+1; project to DTOs when possible
• Index tenant columns and frequent filter combinations; create unique composites for business rules
• Add RowVersion for optimistic concurrency; catch DbUpdateConcurrencyException
• Apply global query filters for multi-tenancy; bypass with IgnoreQueryFilters when needed
• Encapsulate in repositories or inject DbContext directly into services

Resources

• Entity configuration: patterns/entity-configuration.md
• Value objects: patterns/value-objects.md
• Query performance: patterns/query-performance.md
• Indexing strategy: patterns/indexing.md
• Optimistic concurrency: patterns/concurrency.md
• Global query filters: patterns/query-filters.md
• Repository pattern: patterns/repository-pattern.md

Default locations

• Entity configurations: src/GloboTicket.Infrastructure/Persistence/Configurations
• DbContext: src/GloboTicket.Infrastructure/Persistence/GloboTicketDbContext.cs
• Repositories (if used): src/GloboTicket.Infrastructure/Persistence/Repositories
• Migrations: src/GloboTicket.Infrastructure/Migrations

Validation checklist

• Entities have private setters and parameterless constructors for EF
• Configurations use Fluent API with separate IEntityTypeConfiguration classes
• Tenant columns indexed; composite indexes match query patterns
• Read-only queries use AsNoTracking and project to DTOs
• Include/split queries prevent N+1; large collections use AsSplitQuery
• Concurrency tokens configured where updates are common
• Global filters applied to ITenantEntity types; IgnoreQueryFilters used sparingly
• SaveChanges called in repositories or services consistently