Can't access DbContext in class that extends Hub

Question

I'm trying to access my DbContext inside my SignalR Hub, but it keeps throwing this exception:

{"Value cannot be null. (Parameter 'unitOfWork')"}

I don't know what is the problem. Here is my code:

public class MyHub : Hub
{
    private readonly IRepository<MyTable, long> _repository;

    public MyHub (IRepository<MyTable, long> repository)
    {
        _repository = repository;
    }

    public async Task Get(TestDto testDto)
    {
        try
        {
            var myData = await _repository.GetDbContext().Set<MyTable>()
                .Include(x => x.obj1)
                .ThenInclude(x => x.list1)
                .ThenInclude(x => x.obj2)
                .ToListAsync();

            await Clients.All.SendAsync("Get", myData);
        }
        catch (Exception ex)
        {
            throw new UserFriendlyException(ex.InnerException.Message.ToString());
        }
    }
}

Note: I'm using ASP.NET Boilerplate framework (.NET core 3.1 and Angular)

Answer 1

Add [UnitOfWork] attribute and make it a virtual method:

[UnitOfWork]
public virtual async Task Get(TestDto testDto)
{
    // ...
}

Or you can inject IUnitOfWorkManager to begin a UnitOfWork explicitly:

public async Task Get(TestDto testDto)
{
    using (var uow = UnitOfWorkManager.Begin())
    {
        try
        {
            var myData = await _repository.GetDbContext().Set<MyTable>()
                .Include(x => x.obj1)
                .ThenInclude(x => x.list1)
                .ThenInclude(x => x.obj2)
                .ToListAsync();

            await Clients.All.SendAsync("Get", myData);
        }
        catch (Exception ex)
        {
            throw new UserFriendlyException(ex.InnerException.Message.ToString());
        }
    }
}