Relacionamento Many-to-Many no Entity Framework 3.1 (EF Core 3.1)

dotnet-efcore-3.1-many-to-many.cs

using System.Collections.Generic;

namespace Example.Dotnet
{
    public class Product
    {
        public long ProductId { get; set; }
        public string Name { get; set; }

        public virtual ICollection<ProductCategory> ProductCategories { get; set; }
    }

    public class Category
    {
        public long CategoryId { get; set; }
        public string Name { get; set; }

        public virtual ICollection<ProductCategory> ProductCategories { get; set; }
    }

    public class ProductCategory
    {
        public int ProductId { get; set; }
        public int CategoryId { get; set; }

        public virtual Product Product { get; set; }
        public virtual Category Category { get; set; }
    }
}