Question

我有两张桌子：

[Table(Name="Booking")]
public class Booking
{
    private EntityRef<Transaction> _transaction;

    [Column(IsPrimaryKey = true, IsDbGenerated = true)] 
    public int ID;

    [Column] public int Quantity;
    [Column] public int EventID;
    [Column] public int TransactionID;

   [Association(Strorage = "_transaction", ThisKey = "TransactionID", OtherKey = "ID")]
    public Transaction Transaction
    {
        get { return _transaction.Entity; }
        set { _transaction.Entity = value; }
    }
}

[Table(Name="Transaction")]
public class Transaction
{
    [Column(IsPrimaryKey = true, IsDbGenerated = true)]
    public int ID;

    [Column] public decimal Amount;
    [Column] public DateTime DatePaid;

}

我想做以下事情：

Booking booking = new Booking
{
    /* set data */
    Transaction = new Transaction
       {
           Amount = 200,
           DatePaid = DateTime.Now
       }
}
db.Bookings.InsertOnSubmit(booking);
db.SubmitChanges();

但它不会插入事务并标记外键约束错误。

有没有办法可以同时在预订时添加交易，而无需再调用db.SubmitChanges（）两次来获取TransactionID？

Answer 1

尝试以下方法：

var booking = new Booking();
booking.Transaction.Add(new Transaction { Amount = 200, DatePaid = DateTime.Now });
db.Bookings.InsertOnSubmit(booking);
db.SubmitChanges()

Linq To Sql使用新的关联记录插入记录

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