如何用LINQ和C＃插入记录并返回该记录的主键

Question

编写LINQ查询插入记录然后使用C＃返回新插入记录的主键的最佳方式是什么？

Answer 1

主键值将在SubmitChanges（）之后的属性中。

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

与AutoGeneratedValue =真实的记录由dc.SubmitChanges（）

Answer 3

// 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;