Entity Framework 6 - Knowledge Base (KB)

Unable to attach a detached entity: "An object with the same key already exists in the ObjectStateManager"

I am trying to attach an entity to the ObjectContext. When I do so, the following InvalidOperationException is thrown:...An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the sa...

ObjectContext.Refresh()?

How to update ALL the dirty entities from the data store, and reset their changed values to the original store value?...The method ...ObjectContext.Refresh... requires as a parameter the entities to be refreshed.

How do I foreach through my dbcontext entities in EF 4.1?

I'm using ASP.NET Entity Framework 4.1 MVC 3 (C#)...I want to foreach through all the entities in my DbContext. I need to be able to dynamically refer to my entities in order to make dynamic views....I have read Lerman's book, two MVC (2 & 3) books, msdn,...

unexpected GetType() result for entity entry

While I iterating through ...ObjectStateEntries... I expected ...[t]... variable name will be ...MY_ENTITY...foreach (ObjectStateEntry entry in context.ObjectStateManager.GetObjectStateEntries(EntityState.Deleted)) { Type t = entry.Entity.GetType(); ...

MVC5/EF6: Object cannot be deleted because it was not found in the ObjectStateManager?

I have the following ...HttpPost... Delete() method which was working in my MVC5 app. To the best of my knowledge nothing relating to this controller, the View, or even the model has changed. ... // POST: Admin/UserManagement/Delete/5 [HttpPost, Ac...