We_Message/MqttMsgServer/Dao/Repository.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ConsoleHttp.Model;
using MqttMsgServer.Model;

namespace MqttMsgServer.Dao
{
    public class DbRepository<TPrimaryKey, T> : IRepository<TPrimaryKey, T> where T : Entity<TPrimaryKey>
    {
        private readonly ApplicationDbContext _dbContext;
        //public DbRepository(ApplicationDbContext dbContext)
        //{
        //    _dbContext = dbContext;
        //}
        public DbRepository()
        {
            _dbContext = new ApplicationDbContext();
        }
        public IEnumerable<T> GetAll()
        {
            return _dbContext.Set<T>().Where(i => true);
        }

        public T GetById(TPrimaryKey id)
        {
            return _dbContext.Set<T>().AsNoTracking().FirstOrDefault(i => i.Id.Equals(id));
        }

        public T Add(T t)
        {
            _dbContext.Set<T>().Add(t);
            if (_dbContext.SaveChanges() > 0)
            {
                return t;
            }
            return null;
        }

        public T Update(T t)
        {
            _dbContext.Set<T>().Attach(t);
            if (_dbContext.SaveChanges() > 0)
            {
                return t;
            }
            return null;
        }

        public T Delete(T t)
        {
            _dbContext.Set<T>().Remove(t);
            if (_dbContext.SaveChanges() > 0)
            {
                return t;
            }
            return null;
        }
    }
}