How to inject by DI two objects that are of the same type but have one property different?

Question

I'm trying to inject two singleton Cosmos clients that are the same in all senses except for a property that changes their behavior but I need both. This is how I'm adding them in Startup:

        services.AddSingleton(new CosmosClientBuilder(CosmosConnStr))
            .Build());
        services.AddSingleton(new CosmosClientBuilder(CosmosConnStr))
            .WithBulkExecution(true)
            .Build());

Then in the classes I'm injecting as:

public CosmosService(CosmosClient cosmosClient, CosmosClient bulkCosmosClient)

The problem is how do I differentiate one from the other?

Does this answer your question? [Dependency injection of multiple instances of same type in ASP.NET Core 2](https://stackoverflow.com/questions/46476112/dependency-injection-of-multiple-instances-of-same-type-in-asp-net-core-2) — gunr2171, Feb 11 '21 at 17:04
Can you differentiate them by interface? Register one of them as ICosmosClient, and another one as IBulkCosmosClient — user2363676, Feb 11 '21 at 17:07

Boris Sokolov · Accepted Answer · 2021-02-11T19:19:39.960

The easiest way in your case would be using the IEnumerable<CosmosClient>:

public CosmosService(IEnumerable<CosmosClient> bulkCosmosClient)

Extended sample:

public class CosmosClient
{
    public string Connection;

    public CosmosClient(string v)
    {
        this.Connection = v;
    }
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddControllers();

    services.AddSingleton(new CosmosClient("AA"));
    services.AddSingleton(new CosmosClient("BB"));
}

[ApiController]
[Route("[controller]")]
public class CosmosController : ControllerBase
{
    private readonly IEnumerable<CosmosClient> _bulkCosmosClient;

    public CosmosController(IEnumerable<CosmosClient> bulkCosmosClient)
    {
        _bulkCosmosClient = bulkCosmosClient;
    }

    public IActionResult Index()
    {
        List<string> list = new List<string>();
        foreach (var c in _bulkCosmosClient)
        {
            list.Add(c.Connection);
        }

        return new JsonResult(list);
    }
}

How to inject by DI two objects that are of the same type but have one property different?

1 Answers1