如何在.Net Maui中的SQLite Table类定义中创建计算列？
这是table……

[SQLite.Table("ItemHist")]
    public class cl_ItemHist : TableData
    {
        [NotNull, ForeignKey(typeof(cl_Stores))]
        public int Store_id { get; set; }
       
        [NotNull]
         public DateTime PurchDate { get; set; }
        
        [NotNull, ForeignKey(typeof(cl_Items))]
        public int Item_id { get; set; }
       
        [NotNull] 
        public float ItemQty { get; set; }
       
        [NotNull]
        public float TotalPrice { get; set; }
       
        [ForeignKey(typeof(cl_SaleCodes))]
        public int SaleCode_id { get; set; }

        [NotNull, ForeignKey(typeof(cl_Uom))]
        public int UnitPriceUom_id { get; set;}
        
        [NotNull, DefaultValue(0)]
        public int Purchased { get; set; }

        // References cl_Stores
        [OneToOne(CascadeOperations = CascadeOperation.CascadeRead)]
        public cl_Stores StoreName { get; set; }
        
        // References cl_Items
        [OneToOne(CascadeOperations = CascadeOperation.CascadeRead)]
        public cl_Items ItemName { get; set; }
        
        [OneToOne(CascadeOperations = CascadeOperation.CascadeRead)]
        public cl_Items ItemSize { get; set; }

        // References cl_SaleCodes
        [OneToOne(CascadeOperations = CascadeOperation.CascadeRead)]
        public cl_SaleCodes SaleCode { get; set; }

        // References cl_Uom from cl_Items
        [OneToOne(CascadeOperations = CascadeOperation.CascadeRead)]
        public cl_Uom Uom { get; set; }

    }

要包括的计算列包含三个现有列。（总价/（项目大小 * 项目数量））