Call method with covariant generic type specified in supplied parameter?

You should just be able to use: public static void RemoveEach(this EntityCollection collectionToEmpty) where T : class { if (!collectionToEmpty. IsLoaded) collectionToEmpty.Load(); while (collectionToEmpty.Any()) collectionToEmpty. Remove(collectionToEmpty.First()); } That's the only constraint that EntityCollectionI haven't used EF for a while, so it's not entirely obvious.

You should just be able to use: public static void RemoveEach(this EntityCollection collectionToEmpty) where T : class { if (!collectionToEmpty. IsLoaded) collectionToEmpty.Load(); while (collectionToEmpty.Any()) collectionToEmpty. Remove(collectionToEmpty.First()); } That's the only constraint that EntityCollection requires, and you're not using anything within the method body which needs EntityObject.By the way, is what you're doing here very different to calling collectionToEmpty.Clear()?

I haven't used EF for a while, so it's not entirely obvious...

Yay, my first personal drive-by Skeeting! ;) Ok, thanks for the info, I also take your answer to mean generics ARE required. Regarding "is it different", .Clear() would require multiple calls to context.SaveChanges(), effectively preventing me from implementing this sugar without supporting multiple concurrently contexts.As I understand it, the method shown here will behave properly this way, but I'll report back... – shannon Mar 20 at 7:54.

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