Entity Framework by default wraps Insert, Update or Delete operation in a transaction, whenever you execute SaveChanges(). EF starts a new transaction for each operation and completes the transaction when the operation finishes. When you execute another such operation, a new transaction is started.
EF 6 has introduced database.BeginTransaction and Database.UseTransaction to provide more control over transactions. Now, you can execute multiple operations in a single transaction as shown below:
using (System.Data.Entity.DbContextTransaction dbTran = context.Database.BeginTransaction( )) { try { Student std1 = new Student() { StudentName = "newstudent" }; context.Students.Add(std1); context.Database.ExecuteSqlCommand( @"UPDATE Student SET StudentName = ‘Edited Student Name‘" + " WHERE StudentID =1" ); context.Students.Remove(std1); //saves all above operations within one transaction context.SaveChanges(); //commit transaction dbTran.Commit(); } catch (Exception ex) { //Rollback transaction if exception occurs dbTran.Rollback(); } }
database.UseTransaction allows the DbContext to use a transaction which was started outside of the Entity Framework.
Download DB First sample project for Transactions demo.
Entity Framework 6.0 Tutorials（6）：Transaction support
原文：http://www.cnblogs.com/purplefox2008/p/5649547.html