Added filter

DB/WorkDB.cs

@@ -0,0 +1,91 @@
+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; }
+    }
+  }
+}