Dependency Injection for third party data context in ASP.NET core

Question

In my ASP.NET core Web API, I need to use MongoDb. Following is my implementation so far but I am stuck in resolving dependencies.

DataContext:

 public class AppDbContext
    {
        public IMongoDatabase MongoDatabase { get; set; }
        public AppDbContext()
        {
            var client = new MongoClient("mongodb://localhost:27017");
            MongoDatabase = client.GetDatabase("cse-dev-db");
        }
    }

Repository:

public class BuyRepository: IBuyRepository {
    private readonly AppDbContext _appDbContext;
    public BuyRepository(AppDbContext appDbContext) {
        _appDbContext = appDbContext;
    }
    public Buy Add(Buy buy) {
        _appDbContext.MongoDatabase.GetCollection<Buy("Buy").InsertOne(buy);
        return buy;
    }
}

Controller:

private readonly BuyRepository _buyRepository;
public ValuesController(BuyRepository buyRepository) {
    _buyRepository = buyRepository;
}

My question is how to add this dependencies in ConfigureServices

public void ConfigureServices(IServiceCollection services) {
    services.AddApplicationInsightsTelemetry(Configuration);
    services.AddMvc();
    // How to add dependencies here
}

PS: I have already seen this but it does not work.

Update

I have tried as per comment by a user

public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddApplicationInsightsTelemetry(Configuration);
            services.AddScoped<AppDbContext>();
            services.AddMvc();
            services.AddScoped<IBuyRepository, BuyRepository>();
        }

Now I am getting following exception

Unable to resolve service for type 'CseApi.Repositories.BuyRepository' while attempting to activate 'CseApi.Controllers.ValuesController'.

I'm not sure if it is not working I need to check it manually. It strange that mongo db post article which is not tested. — mybirthname
– mybirthname, Commented Oct 5, 2016 at 5:32
You need to inject the interface IBuyStockRepository in the ValuesController constructor, not the concrete type. — Brad
– Brad, Commented Oct 5, 2016 at 6:04

adem caglin · Accepted Answer · 2016-10-05 06:05:52Z

3

Try to register services like:

public void ConfigureServices(IServiceCollection services) {
    services.AddApplicationInsightsTelemetry(Configuration);
    services.AddScoped<AppDbContext>();
    services.AddScoped<IBuyRepository, BuyRepository>();
    services.AddMvc();
    // How to add dependencies here
}

Update for comment

Controller code should be something like below:

private readonly IBuyRepository _buyRepository;
public ValuesController(IBuyRepository buyRepository) {
    _buyRepository = buyRepository;
}

edited Oct 5, 2016 at 6:05

answered Oct 5, 2016 at 5:58

adem caglin

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3 Comments

Atish Kumar Dipongkor Over a year ago

It's throwing exception

Unable to resolve service for type 'CseApi.Repositories.BuyRepository' while attempting to activate 'CseApi.Controllers.ValuesController'

adem caglin Over a year ago

Your controller should take IBuyRepository not BuyRepository. See my update.

Atish Kumar Dipongkor Over a year ago

Yes That was the problem. Thank you

Omar Einea · Accepted Answer · 2018-01-22 21:03:24Z

0

Update your controller's injection from this:

private readonly BuyRepository _buyRepository;

to this:

private readonly IBuyRepository _buyRepository;

edited Jan 22, 2018 at 21:03

Omar Einea

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answered Jan 22, 2018 at 20:12

Mustafa

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