GerbilManager/GerbilManagerWebAPI/DAL/UnitOfWork.cs

using GerbilManagerWebAPI.Models;
using Microsoft.EntityFrameworkCore;

namespace GerbilManagerWebAPI.DAL
{
    public class UnitOfWork : IDisposable
    {
        private ApplicationContext context;
        private GenericRepository<Gerbil> gerbilRepository;
        private GenericRepository<Litter> litterRepository;
        private GenericRepository<Breeder> breederRepository;

        public GenericRepository<Gerbil> GerbilRepository
        {
            get
            {
                if (this.gerbilRepository == null)
                {
                    this.gerbilRepository = new GenericRepository<Gerbil>(context);
                }
                return gerbilRepository;
            }
        }

        public GenericRepository<Litter> LitterRepository
        {
            get
            {
                if (this.litterRepository == null)
                {
                    this.litterRepository = new GenericRepository<Litter>(context);
                }
                return litterRepository;
            }
        }

        public GenericRepository<Breeder> BreederRepository
        {
            get
            {
                if (this.breederRepository == null)
                {
                    this.breederRepository = new GenericRepository<Breeder>(context);
                }
                return breederRepository;
            }
        }

        public UnitOfWork(ApplicationContext context)
        {
            this.context = context;
        }

        public void Save()
        {
            context.SaveChanges();
        }

        private bool disposed = false;

        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    context.Dispose();
                }
            }
            this.disposed = true;
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
    }
}