AddSingleton
AddSingleton is an ASP.NET Core dependency-injection registration method that reuses one service instance for the application's lifetime.
ASP.NET Core in Action, 3e
AddSingleton is an ASP.NET Core service-registration method that registers a service with singleton lifetime.
- How it is used
- Registers services with ASP.NET Core's built-in dependency-injection container when one shared instance should satisfy dependencies.
- How deep it goes
- Defines singleton lifetime and demonstrates type and object registration, but defers detailed lifetime discussion and asynchronous factories.
- Examples
- Uses MessageFactory and EmailServerSettings to demonstrate type registration and reuse of a supplied configuration object.
- What you can do after
- Operate/configure ASP.NET Core's DI container by registering a reusable service or preconstructed object with AddSingleton.
Pro ASP.NET Core 7, Tenth Edition
AddSingleton is an ASP.NET Core dependency-injection registration method that reuses one service instance for the lifetime of the application.
- How it is used
- Registers shared services in ASP.NET Core's dependency-injection container for handlers and other components.
- How deep it goes
- Explains generic registration, handler resolution, first-use creation, and reuse, then contrasts scoped and transient lifecycles.
- Examples
- Uses IResponseFormatter with HtmlResponseFormatter and IHttpContextAccessor with HttpContextAccessor as registration examples.
- What you can do after
- Apply it via ASP.NET Core dependency injection to provide one reusable implementation instance wherever its service type is requested.
Read how Pro ASP.NET Core 7, Tenth Edition explains AddSingleton →
Related concepts
- Singleton patternconfigures · The Singleton pattern restricts a type or component to one shared instance within a defined scope and provides a way to access it.
- dependency injectionconfigures · Dependency injection is a software design technique in which a component receives its dependencies from outside rather than creating or locating them internally.
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