Linq To Sql: handle NewID()

Question

hey, im trying to add data to my sqlserver by using Linq To Sql, in the table, the data design to get NEWID() when new row is inserted, but the linq to sql ignore it and the cell in null,

thanks!

Answer 1

It sounds like you're expecting a guid value to be auto-generated for you right at the time of insert. It sounds like that column has a DEFAULT of NewID().

In your LINQ To SQL model, navigate to the table's property whose value is auto-generated. Right-click, Properties, and ensure the attribute Auto Generated Value is set to True. This will ensure the INSERT statement generated doesn't include a value for this table attribute.

Then you'll be able to access that new property with the default auto-gen value as such:

Customer c = new Customer{FirstName="foo"};
db.Customers.InsertOnSubmit(c);
db.SubmitChanges();
string someGuid = c.MyGuidField.ToString();