How to determine if a Linq object was bound to a data context?

Question

Using Linq-to-Sql:

MyClass obj;
...
// need to delete this object
dataContext.GetTable(obj.GetType()).DeleteOnSubmit(obj);

BUT

I do not know if it was attached objto a data context. And if it is not, the last call to DeleteOnSubmit throws an exception.

There should be an easy way to tell if it is attached objto dataContext, but I don't see anything obvious.

How do you do this?

Answer 1

While you can take a look at your design, as this should be something that you can determine deterministically, this can be done.

, , , (, L2S, "" ), , Context.Services.ChangeTracker.GetTrackedObject, internal. , , - Table.GetOriginalEntityState, . null, ( ). null, ().

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Answer 2

Link2SQL, ? . ? obj , dataContext.

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Answer 3

, , - PropertyChanging PropertyChanged.

, :

public virtual void Detach()
{
   PropertyChanging = null;
   PropertyChanged = null;
} 

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