using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var original = new Product {

            Id = 1,

            IdentifierForProducts = new List<IdentifierForProduct>() {

                new IdentifierForProduct {

                    ProductId = 1,

                    Id = 2  

                }

            }

        };

        var clone = MakeClone(original);

        // Expect "0" because EF did not assign a new ID to the cloned Product yet

        Console.WriteLine(clone.IdentifierForProducts.First().ProductId);

    }

​

    private static Product MakeClone(Product Original) {

    Product Clone = new Product

    {

        ProductGroupId = Original.ProductGroupId,

        ProductGroupSortOrder = Original.ProductGroupSortOrder + 1,

        Info = Original.Info,

        LongInfo = Original.LongInfo,

        Price = Original.Price,

        ProductTypeId = Original.ProductTypeId,

        Title = Original.Title,

        Type = Original.Type,

        Weight = Original.Weight,

        IdentifierForProducts = Original

            .IdentifierForProducts

            .Select(i => CloneIdentifierForProduct(i))

            .ToList(),

    };

​

    // fix FKs

    foreach (var ifp in Clone.IdentifierForProducts) ifp.ProductId = Clone.Id;

    //foreach (var ofp in Clone.ProductPropertyOptionForProducts) ofp.ProductId = Clone.Id;

    //foreach (var pic in Clone.InCategories) pic.ProductId = Clone.Id;

    //foreach (var fpp in Clone.InFrontPages) fpp.ProductId = Clone.Id;

    //foreach (var pi in Clone.Images) pi.ProductId = Clone.Id;

    return Clone;

    }

    private static IdentifierForProduct CloneIdentifierForProduct(IdentifierForProduct ifp) {

    IdentifierForProduct IFP = new IdentifierForProduct

    {

        Product = ifp.Product,

        ProductId = ifp.ProductId,

        ProductIdentifier = ifp.ProductIdentifier,

        ProductIdentifierId = ifp.ProductIdentifierId,

        Value = ifp.Value

    };

    return IFP;

   }

}

​

public class Product

{

    public int Id { get; set; }

    public int ProductGroupId { get; set; }

    public int ProductGroupSortOrder { get; set; }

​

    [Required, MaxLength(30), MinLength(4)]     public string Title { get; set; }

    [MaxLength(200)]                            public string Info { get; set; }

    [MaxLength(4000)]                           public string LongInfo { get; set; }

    [Required, DataType(DataType.Currency)]     public decimal Price { get; set; }

                                                public int Weight { get; set; }

                                                public int ProductTypeId { get; set; }

    //public ICollection<ProductImage> Images { get; set; }

​

    // Selected property options for this product

    public ICollection<PropertyOptionForProduct> ProductPropertyOptionForProducts { get; set; }

​

    // A product can have multiple identifiers (EAN, ISBN, product number, etc.)

    public ICollection<IdentifierForProduct> IdentifierForProducts { get; set; }

​

    public ProductType Type { get; set; }

    //public ICollection<FrontPageProduct> InFrontPages { get; set; }

    public ICollection<ProductInCategory> InCategories { get; set; }

}

​

public class ProductInCategory

// A linking table for which products belongs to which categories

{

    public int Id { get; set; }

    public int ProductId { get; set; }

    public int ProductCategoryId { get; set; }

    public int SortOrder { get; set; }

​

    // Nav.props.:

    public Product Product { get; set; }

    public ProductCategory ProductCategory { get; set; }

}

​

public class PropertyOptionForProduct

{

    public int Id { get; set; }

    public int ProductId { get; set; }

    public int ProductPropertyId { get; set; }

    public int ProductPropertyOptionId { get; set; }

​

    // Nav.props.

    public Product Product { get; set; }

    public ProductPropertyOption ProductPropertyOption { get; set; }

}

​

public class IdentifierForProduct

{

    public int Id { get; set; }

    public int ProductId { get; set; }

    public int ProductIdentifierId { get; set; }

    [StringLength(30), MaxLength(30)]

    public string Value { get; set; }

​

    public ProductIdentifier ProductIdentifier { get; set; }

    public Product Product { get; set; }

}

​

public enum ProductType {}

public enum ProductCategory {}

public enum ProductPropertyOption {}

public enum ProductIdentifier {}