In Entity Framework, how can I remove many rows? (without foreach)

entity-framework

Question

I'm deleting several items from a table using Entity Framework. There isn't a foreign key / parent object so I can't handle this with OnDeleteCascade.

Right now I'm doing this:

var widgets = context.Widgets
    .Where(w => w.WidgetId == widgetId);

foreach (Widget widget in widgets)
{
    context.Widgets.DeleteObject(widget);
}
context.SaveChanges();

It works but the foreach bugs me. I'm using EF4 but I don't want to execute SQL. I just want to make sure I'm not missing anything - this is as good as it gets, right? I can abstract it with an extension method or helper, but somewhere we're still going to be doing a foreach, right?

1
301
3/25/2010 10:24:26 PM

Accepted Answer

If you don't want to execute SQL directly calling DeleteObject in a loop is the best you can do today.

However you can execute SQL and still make it completely general purpose via an extension method, using the approach I describe here.

Although that answer was for 3.5. For 4.0 I would probably use the new ExecuteStoreCommand API under the hood, instead of dropping down to the StoreConnection.

49
5/23/2017 12:26:34 PM

Popular Answer

EntityFramework 6 has made this a bit easier with .RemoveRange().

Example:

db.People.RemoveRange(db.People.Where(x => x.State == "CA"));
db.SaveChanges();


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