Module.EventRegistration/Server/Repository/EventRepository.cs

using Microsoft.EntityFrameworkCore;
using System.Linq;
using System.Collections.Generic;
using Oqtane.Modules;

namespace SZUAbsolventenverein.Module.EventRegistration.Repository
{
    public class EventRepository : IEventRepository, ITransientService
    {
        private readonly IDbContextFactory<EventRegistrationContext> _factory;

        public EventRepository(IDbContextFactory<EventRegistrationContext> factory)
        {
            _factory = factory;
        }

        public IEnumerable<Models.Event> GetEvents(int ModuleId)
        {
            using var db = _factory.CreateDbContext();
            return db.Event.Where(item => item.ModuleId == ModuleId).ToList();
        }

        public Models.Event GetEvent(int EventRegistrationId)
        {
            return GetEvent(EventRegistrationId, true);
        }

        public Models.Event GetEvent(int EventRegistrationId, bool tracking)
        {
            using var db = _factory.CreateDbContext();
            if (tracking)
            {
                return db.Event.Find(EventRegistrationId);
            }
            else
            {
                return db.Event.AsNoTracking().FirstOrDefault(item => item.EventRegistrationId == EventRegistrationId);
            }
        }

        public Models.Event AddEvent(Models.Event EventRegistration)
        {
            using var db = _factory.CreateDbContext();
            db.Event.Add(EventRegistration);
            db.SaveChanges();
            return EventRegistration;
        }

        public Models.Event UpdateEvent(Models.Event EventRegistration)
        {
            using var db = _factory.CreateDbContext();
            db.Entry(EventRegistration).State = EntityState.Modified;
            db.SaveChanges();
            return EventRegistration;
        }

        public void DeleteEvent(int EventRegistrationId)
        {
            using var db = _factory.CreateDbContext();
            Models.Event EventRegistration = db.Event.Find(EventRegistrationId);
            db.Event.Remove(EventRegistration);
            db.SaveChanges();
        }
    }
}