VisualComponents/VisualComponentsForm/DatabaseImplement/Implements/LabWorkStorage.cs

using Contracts.BindingModel;
using Contracts.SearchModel;
using Contracts.StorageContracts;
using Contracts.ViewModel;
using DatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DatabaseImplement.Implements
{
    public class LabWorkStorage : ILabWorkStorage
    {
        public List<LabWorkViewModel> GetFullList()
        {
            using var context = new ElegevContext();

            return context.LabWorks
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public List<LabWorkViewModel> GetFilteredList(LabWorkSearchModel model)
        {
            using var context = new ElegevContext();

            return context.LabWorks
                .Where(x => x.Theme == model.Theme)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public LabWorkViewModel? GetElement(LabWorkSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }

            using var context = new ElegevContext();

            return context.LabWorks
                .FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        public LabWorkViewModel? Insert(LabWorkBindingModel model)
        {
            var newLabWork = LabWork.Create(model);

            if (newLabWork == null)
            {
                return null;
            }

            using var context = new ElegevContext();

            context.LabWorks.Add(newLabWork);
            context.SaveChanges();

            return newLabWork.GetViewModel;
        }

        public LabWorkViewModel? Update(LabWorkBindingModel model)
        {
            using var context = new ElegevContext();

            var labWork = context.LabWorks
                .FirstOrDefault(x => x.Id == model.Id);

            if (labWork == null)
            {
                return null;
            }

            labWork.Update(model);
            context.SaveChanges();

            return labWork.GetViewModel;
        }

        public LabWorkViewModel? Delete(LabWorkBindingModel model)
        {
            using var context = new ElegevContext();

            var element = context.LabWorks
                .FirstOrDefault(rec => rec.Id == model.Id);

            if (element != null)
            {
                context.LabWorks.Remove(element);
                context.SaveChanges();

                return element.GetViewModel;
            }

            return null;
        }
    }
}