如何使用LINQ和C＃插入记录并返回该记录的主键

Question

编写插入记录然后使用C＃返回新插入记录的主键的LINQ查询的最佳方法是什么？

Answer 1

The primary key value will be in that property after the SubmitChanges().

MyTable record = new MyTable();
record.Name = "James Curran";
db.MyTable.InsertOnSubmit(record);
db.SubmitChanges();
Console.WriteLine("record inserted as ID : {0}", record.Id);

Answer 2

// Create a new Order object.
Order ord = new Order
{
    OrderID = 12000,
    ShipCity = "Seattle",
    OrderDate = DateTime.Now
    // …
};

// Add the new object to the Orders collection.
db.Orders.InsertOnSubmit(ord);

// Submit the change to the database.
try
{
    db.SubmitChanges();
}
catch (Exception e)
{
    Console.WriteLine(e);
    // Make some adjustments.
    // ...
    // Try again.
    db.SubmitChanges();
}
return ord.OrderID;

Answer 3

任何具有AutoGeneratedValue = true的字段将在dc.SubmitChanges（）将该记录提交到数据库后填写