Entity Framework Core Tutorial 遷移

public class Customer
{
    public int CustomerId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Address { get; set; }
    public virtual List<Invoice> Invoices { get; set; }
}

public class Invoice
{
    public int Id { get; set; }
    public DateTime Date { get; set; }

    public int CustomerId { get; set; }

    [ForeignKey("CustomerId")]
    public virtual Customer Customer { get; set; }
    public virtual List<InvoiceItem> Items { get; set; }
}

public class InvoiceItem
{
    public int InvoiceItemId { get; set; }
    public int InvoiceId { get; set; }
    public string Code { get; set; }

    [ForeignKey("InvoiceId")]
    public virtual Invoice Invoice { get; set; }
}

public class MyContext : DbContext
{
    public DbSet<Customer> Customers { get; set; }
    public DbSet<Invoice> Invoices { get; set; }
    public DbSet<InvoiceItem> InvoiceItems { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder
            .UseSqlServer(@"Data Source=(localdb)\ProjectsV13;Initial Catalog=CustomerDB;");
    }
}

public class Customer
{
    public int CustomerId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Address { get; set; }
    public string PhoneNumber { get; set; }
    public virtual List<Invoice> Invoices { get; set; }
}

public partial class AddPhoneNumber : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AddColumn<string>(
            name: "PhoneNumber",
            table: "Customers",
            nullable: true);
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.DropColumn(
            name: "PhoneNumber",
            table: "Customers");
    }
}