Database.BeginTransaction()

可以针对单个事务执行多个操作,以便在任何操作失败时可以回滚更改。

using (var context = new PlanetContext())
{
    using (var transaction = context.Database.BeginTransaction())
    {
        try
        {
            //Lets assume this works
            var jupiter = new Planet { Name = "Jupiter" };
            context.Planets.Add(jupiter);
            context.SaveChanges();

            //And then this will throw an exception
            var neptune = new Planet { Name = "Neptune" };
            context.Planets.Add(neptune);
            context.SaveChanges();

            //Without this line, no changes will get applied to the database
            transaction.Commit();
        }
        catch (Exception ex)
        {
            //There is no need to call transaction.Rollback() here as the transaction object
            //will go out of scope and disposing will roll back automatically
        }
    }
}

请注意,显式调用 transaction.Rollback() 可能是开发人员的惯例,因为它使代码更加不言自明。此外,可能有(不太知名的)实体框架的查询提供程序没有正确实现 Dipsose,这也需要一个明确的 transaction.Rollback() 调用。