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How to specify the service life for a registered service that is added as a dependency?
How to specify the service life for a registered service that is added as a dependency?
ASP.NET Core allows us to specify the lifetime for registered services. The service instance gets disposed of automatically based on a specified lifetime. So, we do not care about the cleaning these dependencies, it will take care of the ASP.NET Core framework. There are three types of lifetimes.
1-Singleton
ASP.NET Core will create and share a single instance of the service through the application life. The service can be added as a singleton using the AddSingleton method of IServiceCollection. ASP.NET Core creates a service instance at the time of registration and subsequence requests use this service instance. Here, we do not require to implement the Singleton design pattern and single instance maintained by the ASP.NET Core itself.
Example
2-Transient
ASP.NET Core will create and share an instance of the service every time to the application when we ask for it. The service can be added as Transient using the AddTransient method of IServiceCollection. This lifetime can be used in stateless service. It is a way to add lightweight service.
Example
3-Scoped
ASP.NET Core will create and share an instance of the service per request to the application. It means that a single instance of service is available per request. It will create a new instance in the new request. The service can be added as scoped using an AddScoped method of IServiceCollection. We need to take care while the service registered via Scoped in middleware and inject the service in the Invoke or InvokeAsync methods. If we inject dependency via the constructor, it behaves like a singleton object.
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About Author
Brijesh Kumar
Database Developer
I have more then 6 years Experience in Microsoft Technologies - SQL Server Database, ETL
Azure Cloud - Azure SQL Database, CosmosDB, Azure Data Factory, PowerBI, Web Job, Azure Function, Azure Storage, Web Apps, Powershall
and Database Migration On-Premise to Azure Cloud.
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