When we use AddScoped, AddSingleton, and AddTransient ?

Question

what's the difference between using AddScoped, AddSingleton, and AddTransient when registering the service?

Vishal Yelve · Answer

In ASP.NET Core, dependency injection (DI) is a fundamental concept that allows you to manage the lifetime of services. The methods AddScoped() , AddTransient() , and AddSingleton() are used to register services with different lifetimes. Here’s a breakdown of each: AddTransient() : Lifetime : Transient services are created each time they are requested. This means that every time a service is injected, a new instance is provided. Use Case : Use AddTransient() for lightweight, stateless services where you want a new instance for each request. For example, services that perform operations that do not maintain state between requests. services.AddTransient (); AddScoped() : Lifetime : Scoped services are created once per request (or per scope). This means that within a single request, the same instance is used, but a new instance is created for each new request. Use Case : Use AddScoped() for services that need to maintain state during a single request but should not share state across different requests. This is commonly used for database contexts. services.AddScoped (); AddSingleton() : Lifetime : Singleton services are created once and shared throughout the application's lifetime. The same instance is used for all requests and all users. Use Case : Use AddSingleton() for services that are expensive to create and do not maintain any state that is specific to a user or request. This is suitable for services that are stateless or that can safely share state across requests. services.AddSingleton (); ???????IMP Points to know AddTransient() : New instance every time it is requested. AddScoped() : New instance per request. AddSingleton() : Single instance for the entire application lifetime.

When we use AddScoped, AddSingleton, and AddTransient ?

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