{"slug":"aaronontheweb-efcore-patterns","name":"efcore-patterns","description":"Entity Framework Core best practices including NoTracking by default, query splitting for navigation collections, migration management, dedicated migration services, and common pitfalls to avoid.","long_description":"---\nname: efcore-patterns\ndescription: Entity Framework Core best practices including NoTracking by default, query splitting for navigation collections, migration management, dedicated migration services, and common pitfalls to avoid.\ninvocable: false\n---\n\n# Entity Framework Core Patterns\n\n## When to Use This Skill\n\nUse this skill when:\n- Setting up EF Core in a new project\n- Optimizing query performance\n- Managing database migrations\n- Integrating EF Core with .NET Aspire\n- Debugging change tracking issues\n- Loading multiple navigation collections efficiently (query splitting)\n\n## Core Principles\n\n1. **NoTracking by Default** - Most queries are read-only; opt-in to tracking\n2. **Never Edit Migrations Manually** - Always use CLI commands\n3. **Dedicated Migration Service** - Separate migration execution from application startup\n4. **ExecutionStrategy for Retries** - Handle transient database failures\n5. **Explicit Updates** - When NoTracking, explicitly mark entities for update\n\n---\n\n## Pattern 1: NoTracking by Default\n\nConfigure your DbContext to disable change tracking by default. This improves performance for read-heavy workloads.\n\n```csharp\npublic class ApplicationDbContext : DbContext\n{\n    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)\n        : base(options)\n    {\n        // Disable change tracking by default for better performance on read-only queries\n        // Use .AsTracking() explicitly for queries that need to track changes\n        ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;\n    }\n\n    public DbSet<Order> Orders => Set<Order>();\n    public DbSet<Customer> Customers => Set<Customer>();\n}\n```\n\n### When NoTracking is Active\n\n**Read-only queries work normally:**\n```csharp\n// ✅ Fast read - no tracking overhead\nvar orders = await dbContext.Orders\n    .Where(o => o.Status == OrderStatus.Pending)\n    .ToListAsync();\n```\n\n**Writes require explicit handling:**\n```csharp\n// ❌ WRONG - Entity not tracked, SaveChanges does nothing\nvar order = await dbContext.Orders.FirstOrDefaultAsync(o => o.Id == orderId);\norder.Status = OrderStatus.Shipped;\nawait dbContext.SaveChangesAsync(); // Nothing happens!\n\n// ✅ CORRECT - Explicitly mark entity for update\nvar order = await dbContext.Orders.FirstOrDefaultAsync(o => o.Id == orderId);\norder.Status = OrderStatus.Shipped;\ndbContext.Orders.Update(order); // Marks entire entity as modified\nawait dbContext.SaveChangesAsync();\n\n// ✅ ALSO CORRECT - Use AsTracking() for the query\nvar order = await dbContext.Orders\n    .AsTracking()\n    .FirstOrDefaultAsync(o => o.Id == orderId);\norder.Status = OrderStatus.Shipped;\nawait dbContext.SaveChangesAsync(); // Works!\n```\n\n### When to Use Tracking\n\n| Scenario | Use Tracking? | Why |\n|----------|---------------|-----|\n| Display data in UI | No | Read-only, no updates |\n| API GET endpoints | No | Returning data, no mutations |\n| Update single entity | Yes or explicit Update() | Need to save changes |\n| Complex update with navigation | Yes | Tracking handles relationships |\n| Batch operations | No + ExecuteUpdate | More efficient |\n\n### Explicit Add/Update Pattern\n\n```csharp\npublic class OrderService\n{\n    private readonly ApplicationDbContext _db;\n\n    // CREATE - Always use Add (works regardless of tracking)\n    public async Task<Order> CreateOrderAsync(Order order)\n    {\n        _db.Orders.Add(order);\n        await _db.SaveChangesAsync();\n        return order;\n    }\n\n    // UPDATE - Explicitly mark as modified\n    public async Task UpdateOrderStatusAsync(Guid orderId, OrderStatus newStatus)\n    {\n        var order = await _db.Orders.FirstOrDefaultAsync(o => o.Id == orderId)\n            ?? throw new NotFoundException($\"Order {orderId} not found\");\n\n        order.Status = newStatus;\n        order.UpdatedAt = DateTimeOffset.UtcNow;\n\n        // Explicitly mark as modified since DbContext uses NoTracking by default\n        _db.Orders.Update(order);\n        await _db.SaveChangesAsync();\n    }\n\n    // DELETE - Attach and remove\n    public async Task DeleteOrderAsync(Guid orderId)\n    {\n        var order = new Order { Id = orderId };\n        _db.Orders.Remove(order);\n        await _db.SaveChangesAsync();\n    }\n}\n```\n\n---\n\n## Pattern 2: Never Edit Migrations Manually\n\n**CRITICAL:** Always use EF Core CLI commands to manage migrations. Never:\n- Manually edit migration files (except for custom SQL in `Up()`/`Down()`)\n- Delete migration files directly\n- Rename migration files\n- Copy migrations between projects\n\n### Creating Migrations\n\n```bash\n# Create a new migration\ndotnet ef migrations add AddCustomerTable \\\n    --project src/MyApp.Infrastructure \\\n    --startup-project src/MyApp.Api\n\n# With a specific DbContext (if you have multiple)\ndotnet ef migrations add AddCustomerTable \\\n    --context ApplicationDbContext \\\n    --project src/MyApp.Infrastructure \\\n    --startup-project src/MyApp.Api\n```\n\n### Removing Migrations\n\n```bash\n# Remove the last migration (if not yet applied)\ndotnet ef migrations remove \\\n    --project src/MyApp.Infrastructure \\\n    --startup-project src/MyApp.Api\n\n# NEVER do this:\n# rm Migrations/20240101_AddCustomerTable.cs  # ❌ BAD!\n```\n\n### Applying Migrations\n\n```bash\n# Apply all pending migrations\ndotnet ef database update \\\n    --project src/MyApp.Infrastructure \\\n    --startup-project src/MyApp.Api\n\n# Apply to a specific migration\ndotnet ef database update AddCustomerTable \\\n    --project src/MyApp.Infrastructure \\\n    --startup-project src/MyApp.Api\n\n# Rollback to a previous migration\ndotnet ef database update PreviousMigrationName \\\n    --project src/MyApp.Infrastructure \\\n    --startup-project src/MyApp.Api\n```\n\n### Generating SQL Scripts\n\n```bash\n# Generate SQL script for all migrations\ndotnet ef migrations script \\\n    --project src/MyApp.Infrastructure \\\n    --startup-project src/MyApp.Api \\\n    --output migrations.sql\n\n# Generate idempotent script (safe to run multiple times)\ndotnet ef migrations script \\\n    --idempotent \\\n    --project src/MyApp.Infrastructure \\\n    --startup-project src/MyApp.Api\n```\n\n---\n\n## Pattern 3: Dedicated Migration Service with Aspire\n\nSeparate migration execution from your main application using a dedicated migration service. This ensures:\n- Migrations complete before the app starts\n- Clean separation of concerns\n- Controlled seeding in test environments\n\n### Project Structure\n\n```\nsrc/\n├── MyApp.AppHost/           # Aspire orchestration\n├── MyApp.Api/               # Main application\n├── MyApp.Infrastructure/    # DbContext and migrations\n└── MyApp.MigrationService/  # Dedicated migration runner\n```\n\n### MigrationService Program.cs\n\n```csharp\nusing MyApp.Infrastructure.Data;\nusing MyApp.MigrationService;\nusing Microsoft.EntityFrameworkCore;\n\nvar builder = Host.CreateApplicationBuilder(args);\n\n// Add Aspire service defaults\nbuilder.AddServiceDefaults();\n\n// Add PostgreSQL DbContext\nvar connectionString = builder.Configuration.GetConnectionString(\"appdb\")\n    ?? throw new InvalidOperationException(\"Connection string 'appdb' not found.\");\n\nbuilder.Services.AddDbContext<ApplicationDbContext>(options =>\n    options.UseNpgsql(connectionString, npgsqlOptions =>\n        npgsqlOptions.MigrationsAssembly(\"MyApp.Infrastructure\")));\n\n// Add the migration worker\nbuilder.Services.AddHostedService<MigrationWorker>();\n\nvar host = builder.Build();\nhost.Run();\n```\n\n### MigrationWorker.cs\n\n```csharp\npublic class MigrationWorker : BackgroundService\n{\n    private readonly IServiceProvider _serviceProvider;\n    private readonly IHostApplicationLifetime _hostApplicationLifetime;\n    private readonly ILogger<MigrationWorker> _logger;\n\n    public MigrationWorker(\n        IServiceProvider serviceProvider,\n        IHostApplicationLifetime hostApplicationLifetime,\n        ILogger<MigrationWorker> logger)\n    {\n        _serviceProvider = serviceProvider;\n        _hostApplicationLifetime = hostApplicationLifetime;\n        _logger = logger;\n    }\n\n    protected override async Task ExecuteAsync(CancellationToken stoppingToken)\n    {\n        _logger.LogInformation(\"Migration service starting...\");\n\n        try\n        {\n            using var scope = _serviceProvider.CreateScope();\n            var dbContext = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();\n\n            await RunMigrationsAsync(dbContext, stoppingToken);\n\n            _logger.LogInformation(\"Migration service completed successfully.\");\n        }\n        catch (Exception ex)\n        {\n            _logger.LogError(ex, \"Migration service failed: {Error}\", ex.Message);\n            throw;\n        }\n        finally\n        {\n            // Stop the application after migrations complete\n            _hostApplicationLifetime.StopApplication();\n        }\n    }\n\n    private async Task RunMigrationsAsync(ApplicationDbContext dbContext, CancellationToken ct)\n    {\n        // Use execution strategy for transient failure handling\n        var strategy = dbContext.Database.CreateExecutionStrategy();\n\n        await strategy.ExecuteAsync(async () =>\n        {\n            var pendingMigrations = await dbContext.Database.GetPendingMigrationsAsync(ct);\n\n            if (pendingMigrations.Any())\n            {\n                _logger.LogInformation(\"Applying {Count} pending migrations...\",\n                    pendingMigrations.Count());\n\n                await dbContext.Database.MigrateAsync(ct);\n\n                _logger.LogInformation(\"Migrations applied successfully.\");\n            }\n            else\n            {\n                _logger.LogInformation(\"No pending migrations. Database is up to date.\");\n            }\n        });\n    }\n}\n```\n\n### AppHost Configuration\n\n```csharp\nvar builder = DistributedApplication.CreateBuilder(args);\n\nvar postgres = builder.AddPostgres(\"postgres\");\nvar db = postgres.AddDatabase(\"appdb\");\n\n// Migrations run first, then exit\nvar migrations = builder.AddProject<Projects.MyApp_MigrationService>(\"migrations\")\n    .WaitFor(db)\n    .WithReference(db);\n\n// API waits for migrations to complete\nvar api = builder.AddProject<Projects.MyApp_Api>(\"api\")\n    .WaitForCompletion(migrations)  // Key: waits for migrations to finish\n    .WithReference(db);\n```\n\n---\n\n## Pattern 4: ExecutionStrategy for Transient Failures\n\nAlways use `CreateExecutionStrategy()` for operations that might fail transiently:\n\n```csharp\npublic async Task UpdateWithRetryAsync(Guid id, Action<Order> update)\n{\n    var strategy = _dbContext.Database.CreateExecutionStrategy();\n\n    await strategy.ExecuteAsync(async () =>\n    {\n        var order = await _dbContext.Orders\n            .AsTracking()\n            .FirstOrDefaultAsync(o => o.Id == id);\n\n        if (order is null) return;\n\n        update(order);\n        await _dbContext.SaveChangesAsync();\n    });\n}\n```\n\n**Important:** You cannot use `CreateExecutionStrategy()` with user-initiated transactions. If you need transactions with retry:\n\n```csharp\nvar strategy = _dbContext.Database.CreateExecutionStrategy();\n\nawait strategy.ExecuteAsync(async () =>\n{\n    // Transaction must be INSIDE the strategy callback\n    await using var transaction = await _dbContext.Database.BeginTransactionAsync();\n\n    try\n    {\n        // ... your operations ...\n        await _dbContext.SaveChangesAsync();\n        await transaction.CommitAsync();\n    }\n    catch\n    {\n        await transaction.RollbackAsync();\n        throw;\n    }\n});\n```\n\n---\n\n## Pattern 5: Bulk Operations with ExecuteUpdate/ExecuteDelete\n\nFor bulk operations, use EF Core 7+ `ExecuteUpdateAsync` and `ExecuteDeleteAsync` instead of loading entities:\n\n```csharp\n// ❌ SLOW - Loads all entities into memory\nvar expiredOrders = await _db.Orders\n    .Where(o => o.ExpiresAt < DateTimeOffset.UtcNow)\n    .ToListAsync();\n\nforeach (var order in expiredOrders)\n{\n    order.Status = OrderStatus.Expired;\n}\nawait _db.SaveChangesAsync();\n\n// ✅ FAST - Single SQL UPDATE statement\nawait _db.Orders\n    .Where(o => o.ExpiresAt < DateTimeOffset.UtcNow)\n    .ExecuteUpdateAsync(setters => setters\n        .SetProp","tagline":"Entity Framework Core best practices including NoTracking by default, query splitting for navigation collections, migration management, dedicated migration services, and common pitfalls to avoid.","category":"automation","tags":["agent-skill"],"author":"Aaronontheweb","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"github fast track","sourceDetail":"Aaronontheweb/dotnet-skills","creatorName":"Aaronontheweb","creatorUrl":"https://github.com/Aaronontheweb","sourceUrl":"https://github.com/Aaronontheweb/dotnet-skills/tree/master/skills/efcore-patterns","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/aaronontheweb-efcore-patterns#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. 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None guarantees runtime safety."},"skill":{"slug":"aaronontheweb-efcore-patterns","name":"efcore-patterns","description":"Entity Framework Core best practices including NoTracking by default, query splitting for navigation collections, migration management, dedicated migration services, and common pitfalls to avoid.","category":"automation","url":"https://www.openagentskill.com/skills/aaronontheweb-efcore-patterns","repository":"https://github.com/Aaronontheweb/dotnet-skills/tree/master/skills/efcore-patterns","github_repo":"Aaronontheweb/dotnet-skills"},"suited_tasks":["Database and SQL workflows","Claude Code teams","teams that value GitHub adoption signals","Understand table relationships","Write safer queries","Explain database changes","Navigate pages","Click and type safely"],"suited_agents":["Codex","Claude Code","Cursor","OpenAgentSkill CLI","CLI"],"install":{"source_evidence":{"status":"source-recorded","sourceRecorded":true,"canOfferInstall":true,"path":"skills/efcore-patterns/SKILL.md","revision":"13e26d39ed01d97ea592235d041304d289f4ba07","notice":"A skill instruction path and install command are recorded. This is not proof of compatibility, runtime success or safety; review the source and permissions first."},"command":"npx skills add Aaronontheweb/dotnet-skills --skill efcore-patterns","ready":true,"targets":[{"id":"openagentskill-cli","label":"CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add aaronontheweb-efcore-patterns"},{"id":"codex","label":"Codex","kind":"agent-prompt","value":"Install the \"efcore-patterns\" agent skill from https://github.com/Aaronontheweb/dotnet-skills/tree/master/skills/efcore-patterns. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Entity Framework Core best practices including NoTracking by default, query splitting for navigation collections, migration management, dedicated migration services, and common pitfalls to avoid. 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