ForeignKey as Required in EntityFramework Code First

Question

I'm working with code first for a ecommerce project,

I have 2 classes: Category and Products

Relationship is one to many, Category has many products, I want to make the foreign key as required (not null) so, if I add a product, I must enter the categoryid.

When I do so, I get this error:

Introducing FOREIGN KEY constraint 'FK_dbo.Products_dbo.Categories_categoryId' on table 'Products' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.

Any ideas?

public class Category :IObjectWithState
{
    [Key]
    public int CategoryId { get; set; }
    [Required]
    public string Discription { get; set; }
    public string Notes { get; set; }
    public int ParentCategoryId { get; set; }

    public virtual ICollection<Product> Products { get; set; }
    public virtual ICollection<Discount> Discounts { get; set; }
    public virtual ICollection<ProductList> ProductLists { get; set; }

    [NotMapped]
    public State state { get; set; }
}

public class Product :IObjectWithState
{
    [Key]
    public int ProductId { get; set; }
    [Required]
    public string ProductName { get; set; }
    [Required]
    public string ShortDiscription { get; set; }
    public string LongDiscription { get; set; }

     [Required]
    public bool Active { get; set; }

    [Required]
    public int categoryId { get; set; }
    [ForeignKey("categoryId")]
    public  Category Category { get; set; }

    public ICollection<ProductImage> ProductImage { get; set; }
    public ICollection<Discount> Discount { get; set; }
    public ICollection<Discussion> Duscussion { get; set; }
    public ICollection<ProductAttributeValue> ProductAttributeValue { get; set; }
    public ICollection<ProductListItem> ProductListItem { get; set; }
    public ICollection<ProductSKU> ProductSKU { get; set; }
    public ICollection<RelatedProduct> RelatedProduct { get; set; }
    public ICollection<Review> Review { get; set; }
    public ICollection<ShoppingCart> ShoppingCart { get; set; }
}

Answer 1

我在Migration类中将cascadeDelete：设置为false