Change convert strategies to save xls imported forces

DataAccess/DTOs/DTOEntities/ForceCombinationFromFileDTO.cs

@@ -0,0 +1,42 @@
+using Newtonsoft.Json;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Shapes;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataAccess.DTOs
+{
+    public class ForceCombinationFromFileDTO : IForceCombinationFromFile
+    {
+        [JsonProperty("Id")]
+        public Guid Id { get; }
+        [JsonProperty("Name")]
+        public string Name { get; set; }
+        [JsonProperty("ForceFiles")]
+        public List<IColumnedFileProperty> ForceFiles { get; set; } = new();
+        [JsonProperty("CombinationProperty")]
+        public IFactoredCombinationProperty CombinationProperty { get; set; } = new FactoredCombinationPropertyDTO(Guid.NewGuid());
+        [JsonProperty("SetInGravityCenter")]
+        public bool SetInGravityCenter { get; set; }
+        [JsonProperty("ForcePoint")]
+        public IPoint2D ForcePoint { get; set; } = new Point2DDTO();
+        
+        public ForceCombinationFromFileDTO(Guid id)
+        {
+            Id = id;
+        }
+
+        public object Clone()
+        {
+            return this;
+        }
+
+        public List<IForceCombinationList> GetCombinations()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}