JSON import added

Utils/DataSerialization.cs

@@ -13,7 +13,8 @@ public static class DataSerialization
 
     private static string LoadData(string path)
     {
-        return System.IO.File.ReadAllText(path);
+        string text = System.IO.File.ReadAllText(path);
+        return text;
     }
 
     public static void SavePoint(Point point, string path)
@@ -41,7 +42,7 @@ public static class Deserialization
     {
         try
         {
-            return string.IsNullOrEmpty(point) ? JsonSerializer.Deserialize<Point>(point) : null;
+            return !string.IsNullOrEmpty(point) ? JsonSerializer.Deserialize<Point>(point) : null;
         }
         catch
         {

Utils/PropertyParentHelper.cs

@@ -0,0 +1,34 @@
+using GazpromApp.Models;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace GazpromApp.Utils
+{
+    public static class PropertyParentHelper
+    {
+        public static void SetPropertyParents(this Point point)
+        {
+            // Set parents for properties in point
+            foreach (var prop in point.Properties)
+            {
+                SetParentsRecursively(prop);
+            }
+
+            // Set parents for properties in equipment
+            foreach (var prop in point.Equipment.SelectMany(equipment => equipment.Properties))
+            {
+                SetParentsRecursively(prop);
+            }
+        }
+
+        private static void SetParentsRecursively(Property property)
+        {
+            foreach (var childProp in property.Properties)
+            {
+                childProp.Parent = property;
+                childProp.ParentId = property.Id;
+                SetParentsRecursively(childProp);
+            }
+        }
+    }
+}