How to clear the DataContext cache on Linq to Sql

Question

I\'m using Linq to Sql to query some database, i only use Linq to read data from the DB, and i make changes to it by other means. (This cannot be changed, this is a restrict

Answer 1

I made this code to really CLEAR the "cached" entities, detaching it.

var entidades = Ctx.ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Deleted | EntityState.Modified | EntityState.Unchanged);
foreach (var objectStateEntry in entidades)
    Ctx.Detach(objectStateEntry.Entity);

Where Ctx are my Context.

Answer 2

You should be able to just requery the result sets that are using this objects. This would not pull a cached set, but would actually return the final results. I know that this may not be as easy or feasible depending on how you setup your app...

HTH.

Answer 3

If you want to refresh a specific object, then the Refresh() method may be your best bet.

Like this:

Context.Refresh(RefreshMode.OverwriteCurrentValues, objectToRefresh);

You can also pass an array of objects or an IEnumerable as the 2nd argument if you need to refresh more than one object at a time.

Update

I see what you're talking about in comments, in reflector you see this happening inside .Refresh():

object objectByKey = context.Services.GetObjectByKey(trackedObject.Type, keyValues);
if (objectByKey == null)
{
    throw Error.RefreshOfDeletedObject();
}

The method you linked seems to be your best option, the DataContext class doesn't provide any other way to clear a deleted row. The disposal checks and such are inside the ClearCache() method...it's really just checking for disposal and calling ResetServices() on the CommonDataServices underneath..the only ill-effect would be clearing any pending inserts, updates or deletes that you have queued.

There is one more option, can you fire up another DataContext for whatever operation you're doing? It wouldn't have any cache to it...but that does involve some computational cost, so if the pending insert, update and deletes aren't an issue, I'd stick with the ClearCache() approach.