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Editorial Team
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Asked: 2026-05-17T02:02:20+00:00

I am using DTOs and converters in an entity framwork scenario. I want to

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I am using DTOs and converters in an entity framwork scenario. I want to update an entity. So I put this statement:
databasecontext.Tablename(s).Attach(entityobj);
Whenever it gets here the program ends with this error:
An entity with the same identity already exists in this EntitySet.

I felt I could get around this by saying databasecontext.Tablename(s).Detach(entityobj);
before I called Attach again. But the program still fails on the Attach statement.

What am I missing? Which method on the DB context calls Update in the Domain Service?

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1 Answer

  1. Editorial Team

    It looks like you are keeping the context open while you make the changes.

    In that case you do not need to reattach the object to the context.

    If you open a context, get an object from a context, then close the context, make some changes to the object, then open a new context. In this case you need to attach the object to the context.

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