Dependency Injection

Tolulope Owolabi

3y1.8kC#

Good day, Kindly help out with this issue:

Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: EventScheduler.IRepository.IUnitOfWork Lifetime: Transient ImplementationType: EventScheduler.Repository.UnitOfWork': Unable to resolve service for type 'EventScheduler.Data.DatabaseContext' while attempting to activate 'EventScheduler.Repository.UnitOfWork'.)'
: Unable to resolve service for type 'EventScheduler.Data.DatabaseContext' while attempting to activate 'EventScheduler.Repository.UnitOfWork'.

Please help out...

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Tuhin Paul3y ago
Accepted answer
Hi,

I think there is an issue with resolving the service for the DatabaseContext while attempting to activate the UnitOfWork.

Ensure that the DatabaseContext class is registered with the dependency injection container. You can do this by adding the following line of code to your ConfigureServices method in the Startup class:
```
services.AddDbContext(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
```
This will register the DatabaseContext class with the dependency injection container and configure it to use the default connection string specified in the appsettings.json file.
Naimish Makwana3y ago
Hello Tolulope,

it appears that the EventScheduler.Repository.UnitOfWork class requires an instance of EventScheduler.Data.DatabaseContext, but the dependency injection container is unable to resolve this service.

To resolve this issue, you may want to ensure that the EventScheduler.Data.DatabaseContext service is registered with the dependency injection container, and that it is correctly configured to be used by the EventScheduler.Repository.UnitOfWork implementation.

Thanks

Naimish Makwana
Sachin Singh3y ago
Make sure to Add DBContext to the service container (for .NET 6 inside Main () or for < .NET 5 inside startup.cs)
```
var connectionString = builder.Configuration.GetConnectionString("AppDb");
builder.Services.AddDbContext(x => x.UseSqlServer(connectionString));
```