updating an entity in entity framework

Question

I have an entity (TerminalCertification) which has relation to other entities. I want to make user to be able to update TerminalCertification but I'm not able to update related object which is updated by user. My update code is here:

public void UpdateTerminalCertification(TerminalCertification terminalCertification)
{
    var lastCertification = db.terminalCertifications.Find(terminalCertification.TerminalCertificationID);

    if (lastCertification==null)
        throw new TerminalCertificationNotFoundException(terminalCertification)                                   
        db.Entry(lastCertification).CurrentValues.SetValues(terminalCertification);
    }

I have searched stackoverflow and found below code but there is not such ObjectStateManager in DBContext class.

ObjectStateManager stateMgr = db.ObjectStateManager;    
ObjectStateEntry stateEntry = stateMgr.GetObjectStateEntry(model);
stateEntry.SetModified();

what should I do?

Jeff · Accepted Answer · 2011-07-11 20:00:10Z

4

You can cast your DbContext to an IObjectContextAdapter which has the underlying ObjectContext and then use the ObjectStateManager off of that.

answered Jul 11, 2011 at 20:00

Jeff

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5 Comments

JGC Over a year ago

it throws this error:The ObjectStateManager does not contain an ObjectStateEntry with a reference to an object of type ...

Jeff Over a year ago

Attach the entity to the DbContext first.

JGC Over a year ago

how to attach my object to DBContext?

Jeff Over a year ago

blogs.msdn.com/b/adonet/archive/2011/01/29/…

Michael Over a year ago

also, you can read about it here : thedatafarm.com/blog/data-access/…

Vaibhav Bora · Accepted Answer · 2011-07-11 23:31:23Z

0

Use the UpdateModel or TryUpdateModel method inside your controller. If you are doing it outside of the controller then this will not work.

answered Jul 11, 2011 at 23:31

Vaibhav Bora

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