Laba7/WpfAppUI/Model/DBRequests.cs

using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using WpfAppUI.Data;

namespace WpfAppUI.Model
{
    /// <summary>
    /// Класс реализует функционал запросов для бд
    /// </summary>
    public static class DBRequests
    {
        //Все рабочие
        public static ICollection<Emploee> AllDataRequest()
        {
            ApplicationContextUI db = new ApplicationContextUI();
            return db.Emploees.ToList();
        }

        //Рабочий по ID
        public static Emploee EmploeeById(int id)
        {
            using (ApplicationContextUI db = new ApplicationContextUI())
            {
                return db.Emploees.Where(i => i.id == id).FirstOrDefault();
            }
        }

        //Все должности
        public static ICollection<Post> PostRequest()
        {
            using (ApplicationContextUI db = new ApplicationContextUI())
            {
                return db.Posts.ToList();
            }
        }

        //Удалить сотрудника
        public static bool DeleteEmploeeById(int id)
        {
            using (ApplicationContextUI db = new ApplicationContextUI())
            {
                var emploee = db.Emploees.Where(i => i.id == id).FirstOrDefault();
                if (emploee != null)
                {
                    db.Remove(emploee);
                    db.SaveChanges();
                    return true;
                }
                return false;
            }
        }

        //Изменить данные о сотруднике
        public static void ChangeEmploeeData(int id, string surname, string name, Post post, DateTime birthday, string phone, string mail, string patronymic = null)
        {
            ApplicationContextUI db = new ApplicationContextUI();
            var emploee = db.Emploees.Where(i => i.id == id).FirstOrDefault();
            emploee.Surname = surname;
            emploee.Name = name;
            emploee.Post = post;
            emploee.Birthday = birthday;
            emploee.Phone = phone;
            emploee.Mail = mail;
            emploee.Patronymic = patronymic;
            db.SaveChanges();
            db.Dispose();
        }

        //Новый сотрудник
        public static bool AddNewEmploee(string surname, string name, Post post, DateTime birthday, string phone, string mail, string patronymic = null)
        {
            ApplicationContextUI db = new ApplicationContextUI();
            bool chek = false;
            if (!db.Emploees.Any(el => el.Name == name && el.Surname == surname && el.Mail == mail || el.Birthday == birthday))
            {
                Emploee emploee = new Emploee
                {
                    Surname = surname,
                    Name = name,
                    Mail = mail,
                    Birthday = birthday,
                    Phone = phone,
                    Post = post,
                    Patronymic = patronymic,
                };
                db.Emploees.Add(emploee);
                db.SaveChanges();
                db.Dispose();
                chek = true;
            }
            return chek;
        }
    }
}