Sql – Linq to Sql: Can I return the Identity_Scope after an insert

identity-columnlinq-to-sql

After I do an insert using linq to sql, can I get the Identity_scope value back if my table has an identity column?

Best Answer

Linq to SQL does the job for you, the identity value it's available just after the SubmitChanges method is called.

var entity = new Entity();
// ...
ctx.Entities.InsertOnSubmit(entity);
ctx.SubmitChanges();
// Here you can use the generated value of yout identity column

entity.Id;

Related Solutions

.net – Entity Framework vs LINQ to SQL

LINQ to SQL only supports 1 to 1 mapping of database tables, views, sprocs and functions available in Microsoft SQL Server. It's a great API to use for quick data access construction to relatively well designed SQL Server databases. LINQ2SQL was first released with C# 3.0 and .Net Framework 3.5.

LINQ to Entities (ADO.Net Entity Framework) is an ORM (Object Relational Mapper) API which allows for a broad definition of object domain models and their relationships to many different ADO.Net data providers. As such, you can mix and match a number of different database vendors, application servers or protocols to design an aggregated mash-up of objects which are constructed from a variety of tables, sources, services, etc. ADO.Net Framework was released with the .Net Framework 3.5 SP1.

This is a good introductory article on MSDN: Introducing LINQ to Relational Data

C# – the syntax for an inner join in LINQ to SQL

It goes something like:

from t1 in db.Table1
join t2 in db.Table2 on t1.field equals t2.field
select new { t1.field2, t2.field3}

It would be nice to have sensible names and fields for your tables for a better example. :)

Update

I think for your query this might be more appropriate:

var dealercontacts = from contact in DealerContact
                     join dealer in Dealer on contact.DealerId equals dealer.ID
                     select contact;

Since you are looking for the contacts, not the dealers.

Best Answer

Related Solutions

.net – Entity Framework vs LINQ to SQL

C# – the syntax for an inner join in LINQ to SQL

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