What is the difference between services.AddTransient, service.AddScoped and service.AddSingleton methods in ASP.NET Core?
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1. Transient objects are always different; a new instance is provided to every controller and every service. 2. Scoped objects are the same within a request, but different across different requests. 3. Singleton objects are the same for every object and every request.
Refs: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/dependency-injection?view=aspnetcore-2.2#service-lifetimes-and-registration-options https://stackoverflow.com/questions/38138100/what-is-the-difference-between-services-addtransient-service-addscoped-and-serv
