Bean scope
A dependency-injection scope is a lifetime boundary within which a service or bean instance is created and reused, with separate instances in different scopes.
ASP.NET Core in Action, 3e
A scoped lifetime reuses one service instance within a dependency-injection scope and creates different instances for different scopes.
- How it is used
- Shares a dependency across services handling one HTTP request while providing a new instance for another request.
- How deep it goes
- Explains registration, instance reuse, disposal, captive dependencies, and manual scope creation through a worked request example.
- Examples
- Compares row counts from an endpoint’s DataContext and a Repository’s injected DataContext across requests.
- What you can do after
- Operate/configure it with AddScoped, scope validation, and manually disposed scopes outside requests.
Pro ASP.NET Core 7, Tenth Edition
A scoped service is a dependency-injection service whose instance is reused within a defined scope, such as one HTTP request scope.
- How it is used
- Controls sharing of dependency-injection service instances among components handling an ASP.NET Core request.
- How deep it goes
- Explains registration, request-level reuse, manual scopes, and resolution outside a scope through observable behavior rather than container internals.
- Examples
- Compares GUIDs from three middleware dependencies across requests and from two filter uses in one request.
- What you can do after
- Operate/configure scoped ASP.NET Core services with AddScoped and create a scope before resolving them during startup.
Read how Pro ASP.NET Core 7, Tenth Edition explains bean scope →
Building Web APIs with ASP.NET Core
A scoped service is a dependency-injected service instance whose lifetime is limited to a single scope, typically one HTTP request in ASP.NET Core.
- How it is used
- Registers ApplicationDbContext for one unit of work while processing a batch rename operation.
- How deep it goes
- Explains scoped registration, SaveChanges timing, change detection, persistence, and disposal before addressing connection-string security.
- Examples
- Uses ApplicationDbContext in Program.cs with a SQL Server DefaultConnection for the MyBGList API.
- What you can do after
- Operate/configure ApplicationDbContext as a scoped service and protect its connection string with development settings or environment variables.
Read how Building Web APIs with ASP.NET Core explains bean scope →
Related concepts
- AddScopedconfigured by · AddScoped is a .NET dependency-injection registration method that assigns a service a scoped lifetime, creating one instance per lifetime scope.
- servicekind of · A service is an application component that provides defined capabilities to other components through an interface.
- request scopeincludes · Request scope is a Spring bean scope in which a distinct bean instance is created for each HTTP request.
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