CODEWITHSUNDEEP
asp.net-core.net-coredependency-injectiondependencies
Himanshu Jain
Himanshu Jain

Reputation: 518

Resolve dependency at runtime

I have a problem in .net core that I need to resolve the dependency based on the value I am getting from the API.

Interface

public interface IBookingSettingsDetails
{
     void GetSettings();
}

Class A

public  class ScheduleSettingsA: IBookingSettingsDetails
{
        public void GetSettings() {}
}

Class B

public  class ScheduleSettingsB: IBookingSettingsDetails
{
        public void GetSettings() {}
}

Resolver under startup.cs file is

            services.AddTransient<Func<int, IBookingSettingsDetails>>(serviceProvider => conferencingType =>
            {
                switch (conferencingType)
                {
                    case 1:
                        return serviceProvider.GetService<ScheduleSettings>();
                    case 2:
                        return serviceProvider.GetService<WebexSettings>();
                    default:
                        throw new InvalidOperationException();
                }
            });

Whenever I am trying to resolve dependency from the controller then I am always getting null in the resolver.

public class VideoConferenceController : ControllerBase
    {
        private readonly Func<int, IBookingSettingsDetails> _serviceAccessor;

        public VideoConferenceController(Func<int, IBookingSettingsDetails> serviceAccessor)
        {
            _serviceAccessor = serviceAccessor;
        }


        [HttpGet]
        [Route("getRandom")]
        public void getRandom(int conferenceType)
        {
            var service= _serviceAccessor(conferenceType);
            service.GetSettings();
        }
}

I want to resolve the dependency based on the parameter specified in the function. I don't want to use any third-party library like Unity. Can it be done using the above approach?

Upvotes: 0

Views: 1525

Answers (1)

Himanshu Jain
Himanshu Jain

Reputation: 518

To resolve this issue. I just added 

services.AddTransient<ScheduleSettingsA>();
services.AddTransient<ScheduleSettingsB>();

in the startup file.

Upvotes: 1

Related Questions