Error Using ADO.NET Entity Framework

Question

I want to convert a list to EntityCollection.

List x = methodcall();
EntityCOllection y = new EntityCollection();

foreach(T t in          


        

Answer 1

Basically all entity objects are controlled by an object context which serves as change tracker. The idea here is that the entities themselves are dumb to their environment, but the object context knows what's going on.

This is an inversion of the DataSet model where the tables track their own changes.

So objects are added to an object context and its entity collections directly. Here you've created an EntityCollection that's not associated with an object context and therefore can't have other objects added to them. They must first be attached to the object context.

Really what you probably want is to return IQueryable instead of IList. That would allow you to execute queries against the results of methodcall().