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Why DbContext Is Scoped and Not Singleton
Understanding dependency injection lifetime, thread safety, and the unit-of-work pattern in Entity Framework
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You’ve probably seen this registration in ASP.NET Core:
builder.Services.AddDbContext<AppDbContext>();By default, AddDbContext() registers DbContext as Scoped. But why not make it a Singleton and reuse same instance throughout the application's lifetime?
Well, well, this isn’t just arbitrary — it’s essential for correctness, performance, and thread safety.
Understanding DbContext
DbContext represents a session with the database. It tracks entity changes, manages database operations, and maintains an internal state.
Think of it as a unit of work for a single request.
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