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28-Oct-2017 08:34

Thanks for reply, but i couldn't manage how to use short-lived context without getting this error: "Object references between two different object scopes are not allowed." I could manage this exception only if i use Create Detach Copy method for loading my entities from db.This is what i use in form load event: So, as you can see disposing the first short-lived context at the form load event does not cause the state of already loaded object changed to un-attach state or something like that.

there is add, edit & delete buttons for stations grid.

That's what I would expect from an Attach method that takes two object parameters. Attach(customer, true); Nope doesn't like that either. How hard could it possibly be to reattach an entity that is actually mapped by the entity manager? I would expect that if you pass in a context loaded object to compare against, that LINQ should be able to reestablish proper update status.

The manager knows all the fields involved and at the very least should be able to create an update statement that checks everything or in the case of comparing two entitities and figuring out the differences. I can use this code and it won't bomb outright: context.tt_customers. I just don't understand what could possibly be so hard about re-attaching an object.

So to implement you might use code like this for the Load: and another routine later on that saves this object (assuming that possibly the context has gone away).

There's a method called Attach provided on the ITable instance that supposedly allows re-attaching an instance to be change tracked. Am I not telling LINQ to compare the two objects and assume the differences to be changes? Address; you now get: Cannot add an entity with a key that is already in use. So, is this the way it's supposed to work or a bug?

there is add, edit & delete buttons for stations grid.

That's what I would expect from an Attach method that takes two object parameters. Attach(customer, true); Nope doesn't like that either. How hard could it possibly be to reattach an entity that is actually mapped by the entity manager? I would expect that if you pass in a context loaded object to compare against, that LINQ should be able to reestablish proper update status.

The manager knows all the fields involved and at the very least should be able to create an update statement that checks everything or in the case of comparing two entitities and figuring out the differences. I can use this code and it won't bomb outright: context.tt_customers. I just don't understand what could possibly be so hard about re-attaching an object.

So to implement you might use code like this for the Load: and another routine later on that saves this object (assuming that possibly the context has gone away).

There's a method called Attach provided on the ITable instance that supposedly allows re-attaching an instance to be change tracked. Am I not telling LINQ to compare the two objects and assume the differences to be changes? Address; you now get: Cannot add an entity with a key that is already in use. So, is this the way it's supposed to work or a bug?

Hello Mehdi, There should not be any problems when you use long-lived dbcontext objects in your forms.