Diplom_B/DB/WorkDB.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Diplom_B.DB
{
  public static class WorkDB
  {
    public static void Init()
    {
			using (var DB = new MainDB())
			{
				var usr = (from u in DB.Users
									 where u.Name == "admin"
									 select u).ToArray();
				if (usr.Length < 1)
				{
					DB.Users.Add(new DB.User()
					{
						Name = "admin",
						Pass = "admin"
					});
				}
				DB.SaveChanges();
			}
    }
		public static Izdelie[] ListIzdelie(string filter = "")
    {
      try
      {
				using (var db = new MainDB())
        {
					if (string.IsNullOrEmpty(filter))
					{
						var tmp = (from a in db.Izdeliya
											 select a).ToArray();
						return tmp;
					}
          else
          {
						var tmp = (from a in db.Izdeliya
											 where
												 a.Id.ToString().Contains(filter) ||
												 a.Name.Contains(filter) ||
												 a.DecNum.Contains(filter) ||
												 a.Shifr.Contains(filter) ||
												 a.Litera.Contains(filter) ||
												 a.Cena.ToString("F2").Contains(filter) ||
												 a.OtdelRazrab.ToString().Contains(filter) ||
												 a.Ved.Contains(filter) ||
												 a.GlavKonstr.Contains(filter)
											 select a).ToArray();
						return tmp;
					}
        }
      }
			catch { throw; }
    }
		public static void AddIzdelie(Izdelie izd)
    {
			try
			{
				using (var db = new MainDB())
				{
					db.Izdeliya.Add(izd);
					db.SaveChanges();
				}
			}
			catch { throw; }
    }
		public static Izdelie GetIzdelie(int id)
    {
      try
      {
				using (var db = new MainDB())
        {
					var res = (from a in db.Izdeliya
										 where a.Id == id
										 select a).ToArray();
					if (res.Length != 1)
						return null;
					else
						return res[0];
        }
      }
			catch { throw; }
    }
  }
}