Why do we need to add all the services in addtransient method in startup.cs file in ASP.NET core?

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adding all services present in the program in addTransient will create instance for these services . This instance creation allocate memory for all service. If there are 200 services then Is this good to allocate memory for all these services at startup ?

public static class ServiceExtensions
    {
        public static IServiceCollection RegisterServices(
            this IServiceCollection services)
        {
            services.AddTransient<ITopicAreaService, TopicAreaService>();
            // Add say 200 services here will allocate memory for all  services at startup 
            //is this good to do so
            return services;
        }
    }

What I have tried:

public static class ServiceExtensions
    {
        public static IServiceCollection RegisterServices(
            this IServiceCollection services)
        {
            services.AddTransient<ITopicAreaService, TopicAreaService>();
            // Add say 200 services here will allocate memory for all  services at startup 
            //is this good to do so
            return services;
        }
    }

Posted 27-Dec-18 5:39am

Diwas Poudel

Updated 27-Dec-18 6:06am

v2

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Matthew Dennis · Answer 1 · 2018-12-27T06:06:00

Solution 1

It is not actually creating the services at this point. Transient services are created as each it resolved from the DI container. All that is allocated is an object that describes the construction of the service and its lifetime.
The techniques that are used to create the instances if very fast and efficient resulting in one of the fastest DI Containers out there.

Posted 27-Dec-18 6:06am

Matthew Dennis

Comments

[no name] 27-Dec-18 21:18pm

In my view allocating memory for all the concrete type present in all say 200 addTransient method is not good at startup.Though you said DI Container maintain these
It's Okay.
My next question is How DI Container knows which service to inject to controller at runtime? Do DI Container inject all Service present in startup.cs to respective controller constructor ?OR does it inject on the basis of Request url ?

Matthew Dennis 28-Dec-18 2:45am

You need to do some research on how DI Containers and DI work. Try using your friendly Google to find some articles, or use the search on this site to let people k for some articles.

[no name] 28-Dec-18 3:24am

ok thank you sir.