Fixing an issue of deletion within Entity Framework

Question

I have this method :

 public async void Delete(params T[] items) { using (var context = new DataEntities()) { foreach (T item in items) { context.Entry(item).State = System.Data.Entity.EntityState.Deleted; } await context.SaveChangesAsync(); } }

When I tried to delete an item :

dpc_participant part = (await SimpleIoc.Default.GetInstance<ICrud<dpc_participant>>().Search(x => x.dpc_id_participant_pk == currentitem.dpc_id_participant_pk && x.dpc_id_fk == currentitem.dpc_id_pk)).FirstOrDefault(); SimpleIoc.Default.GetInstance<ICrud<dpc_participant>>().Delete(part);

I got this error

entity object cannot be referenced by multiple instances of IEntityChangeTracker.

Questions:

What is the reason of this error?
How can I fix it?

your parameters came from a different Database Context, than the one you're creating here. Disable proxies on the source context and see if that does the trick. — Daniel Gimenez
– Daniel Gimenez, Commented Feb 27, 2015 at 17:35

TechneWare · Accepted Answer · 2015-02-27 17:36:42Z

This is happening because your items variable is connected to a different context than the context your function is using.

To Fix, either pass the original context you retrieved the items with into this function and use it or re-query them using the new context within the function and then delete.

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