Добавьте файлы проекта.

BL/Structure.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GroundOrganizer
+{
+    [Serializable]
+    public class Structure
+    {
+        public TypeFlexStructure flexStructure { get; set; }
+        public double L { get; set; }
+        public double H { get; set; }
+        public double Null { get; set; }
+        public int Number { get; set; }
+        public string Name { get; set; }
+        public string Description { get; set; }
+        public ObservableCollection<Foundation> Foundations { get; set; }
+        public ObservableCollection<PlanningVertex> RedPlanning { get; set; }
+        public ObservableCollection<PlanningVertex> BlackPlanning { get; set; }
+        public Structure()
+        {
+            Foundations = new ObservableCollection<Foundation>();
+            RedPlanning = new ObservableCollection<PlanningVertex>();
+            BlackPlanning = new ObservableCollection<PlanningVertex>();
+        }
+    }
+}