How to determine the correct constraint violation on SQLite UpdateException?

Question

I have the following problem qith my local SQLite database. I'm trying to update the data stored via a synchronisation-process with an online SQL-Server database. While there is no problem with the synchonization I often encounter errors when trying to update the local values. E.g. there can be an violation with existing Primary-Key-Constraints on each table. On the other hand there could also be a violation of the Unique-Key on a concrete table.

My question is how to figure out which type of error occured.

I catch the database update or insert like

catch(UpdateException ue)
{
    HandleUpdateException(ue);
}

The handle method is as follows:

private void HandleUpdateException(UpdateException e)
{
    // get inner exception as SQLiteException
    var innerException = e.InnerException as SQLiteException;

    if(innerException != null)
    {
        switch(innerException.ErrorCode)
        {
            case SQLiteError.Constraint:
                // handle constraint-error here
                break;
            default:
                // log error
                break;
        }
    }
}

How do I now which error occured? It's important to know because the handling of PK-violation is completely other than a UK-violation.

I could try to make

if(e.Message.Contains("unique")) // ...

or

if(e.Message.Contains("foreign")) // ...

but I don't like to check with "magic" strings for the kind of error.

So any help would be appreciated.