March 11, 2022 05:46 by
PeterIn this article, we will see the difference between AddScoped vs AddTransient vs AddSingleton in .net core.
Why we require
- It defines the lifetime of object creation or a registration in the .net core with the help of Dependency Injection.
- The DI Container has to decide whether to return a new object of the service or consume an existing instance.
- The lifetime of the Service depends on how we instantiate the dependency.
- We define the lifetime when we register the service.
Three types of lifetime and registration options
- Scoped
- Transient
- Singleton
Scoped
- In this service, with every HTTP request, we get a new instance.
- The same instance is provided for the entire scope of that request. eg., if we have a couple of parameter in the controller, both object contains the same instance across the request
- This is a better option when you want to maintain a state within a request.
services.AddScoped<IAuthService,AuthService>();
Transient
A new service instance is created for each object in the HTTP request.
This is a good approach for the multithreading approach because both objects are independent of one another.
The instance is created every time they will use more memory and resources and can have a negative impact on performance
Utilize for the lightweight service with little or no state.
services.AddTransient<ICronJobService,CronJobService>();
Singleton
Only one service instance was created throughout the lifetime.
Reused the same instance in future, wherever the service is required
Since it's a single lifetime service creation, memory leaks in these services will build up over time.
Also, it has memory efficient as they are created once reused everywhere.
services.AddSingleton<ILoggingService, LoggingService>();
When to use which Service
Singleton approach => We can use this for logging service, feature flag(to on and off module while deployment), and email service
Scoped approach => This is a better option when you want to maintain a state within a request.
Transient approach => Use this approach for the lightweight service with little or no state.
European best, cheap and reliable ASP.NET hosting with instant activation. HostForLIFE.eu is #1 Recommended Windows and ASP.NET hosting in European Continent. With 99.99% Uptime Guaranteed of Relibility, Stability and Performace. HostForLIFE.eu security team is constantly monitoring the entire network for unusual behaviour. We deliver hosting solution including Shared hosting, Cloud hosting, Reseller hosting, Dedicated Servers, and IT as Service for companies of all size.
