Add import primitives to cross-section

StructureHelperCommon/Services/Exports/SinglePolyline2DImportFromDxfLogic.cs

@@ -1,18 +1,25 @@
 using netDxf.Entities;
+using System.Collections.Generic;
 using System.Linq;
 
 namespace StructureHelperCommon.Services.Exports
 {
     public class SinglePolyline2DImportFromDxfLogic : IImportFromFileLogic
     {
-        public string FileName { get; set; }
-        public Polyline2D Polyline2D { get; private set; }
+        public string? FileName { get; set; }
+        public LayerNames LayerName { get; set; } = LayerNames.StructiralPrimitives;
+        public List<Polyline2D> Polyline2Ds { get; private set; } = [];
         public void Import()
         {
-            var importLogic = new ShapesAllImportFromDxfLogic() { FileName = FileName};
+            var importLogic = new EntitiesImportFromDxfLogic()
+            {
+                FileName = FileName
+            };
             importLogic.Import();
             var entities = importLogic.Entities;
-            Polyline2D = entities.Single(x => x is Polyline2D) as Polyline2D;
+            string layerName = new GetDxfLayerLogic().GetLayerName(LayerName);
+            var collection = entities.Where(x => x is Polyline2D && x.Layer.Name == layerName).ToList();
+            collection.ForEach(x => Polyline2Ds.Add(x as Polyline2D));
         }
     }
 }