IEntityChangeTracker error when updating entity through their relation

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i been trying to update entity from its reference as explained below
iam getting this error
An exception of type 'System.InvalidOperationException' occurred in System.Data.Entity.dll but was not handled in user code
Additional information: An entity object cannot be referenced by multiple instances of IEntityChangeTracker.
how to make this happen if i dont want to deal with each entity alone
user[id name]
action[id text userid resultId]]
result[id resulttxt]

C#

public static void test1(action act) {
             act.text="132";
             act.user.name="test";
             act.result.resulttxt="test";
             testEntities e = new testEntities();
             e.actions.Attach(act);
             e.SaveChanges();
       }
          testEntities b = new testEntities();
          action act = b.actions.Include("user").Include("result").Where(x => x.id == 9).FirstOrDefault();
          test1(act);

Posted 9-Jun-14 12:33pm

Prutal

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3 solutions

Solution 3

There is a blog on how to solve this exception http://www.admarketspace.com/Blog/Index. The source code is also available for download

Posted 23-Oct-15 17:05pm

@CodeRelam

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Dave Kreskowiak · Accepted Answer · 2014-06-09T18:18:00

Why are you creating a second DbContext inside your Test1 method? You shouldn't be because now you're trying to track the same entity using two different contexts and that doesn't work. Test1, since it didn't create a context and didn't add anything to the context to track, shouldn't be concerned at all with saving any changes. That should be left up to the caller that made the context instance.

Prutal · Accepted Answer · 2014-06-09T19:07:00

you mean like this

C#

 public static void test1(action act) {       
              act.text="132";
              act.user.name="test";
              act.result.resulttxt="test";
                }
           testEntities b = new testEntities();
           action act = b.actions.Include("user").Include("result").Where(x => x.id == 9).FirstOrDefault();
 test1(act);
b.SaveChanges();

well yes it worked but why i cant attach that entity and save change in the other context

IEntityChangeTracker error when updating entity through their relation

3 solutions

Solution 1

Solution 2

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