Adding dependency injection gives exception in .NET Core

Question

I am getting the following exception. Why is it and how can I solve this?

In SMSService.cs when I comment on the constructor it starts to work, but I will require to access ISMSSender from it.

System.AggregateException: 'Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Authentication.API.Repository.Interface.ISMSService Lifetime: Singleton ImplementationType: Authentication.API.Repository.SMSService': Unable to resolve service for type 'SMSSender.API.Repository.Interface.ISMSSender' while attempting to activate 'Authentication.API.Repository.SMSService'.)'

Authentication.API.Repository.SMSService

public class SMSService : ISMSService
{
    private readonly ISMSSender _smsSender;

    public SMSService(ISMSSender smsSender)
    {
        _smsSender = smsSender;
    }
}

Startup ...

         services.AddTransient<ISMSService, SMSService>();

         ...

SMSSender.API.Repository.Interface.ISMSSender

public interface ISMSSender
{
    Task<SMSUser> SendSMS(SMSUser prospectiveUser);
}

SMSSender.API.Repository.Interface.SMSSender

public class SMSSender : ISMSSender
{
    public async Task<SMSUser> SendSMS(SMSUser sMSUser)
    { }

}

Steve Harris · Accepted Answer · 2020-11-02 14:27:16Z

4

Looks like you didn't register the SMSSender (you did the service):

services.AddTransient<ISMSService, SMSService>();
services.AddTransient<ISMSSender, SMSSender>();

answered Nov 2, 2020 at 14:27

Steve Harris

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3 Comments

Illep Over a year ago

Do I have to ? It comes from another project?

Steve Harris Over a year ago

Yes, absolutely

Steve Harris Over a year ago

You are building your DI container in this stage. You are telling it which services implement each interface. Without this, there is no way to know which service to resolve based on the interface.

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