Achievements for Visual Studio 2010

In my current project, called Studentenverwaltungsprojekt, I use the Entity Framework for querying data from the database and submitting back again. Because my clientapplication is not bound to the database ( using services ! ) all the time I was forced to create ‘businessobjects‘ that are (nearly) stateless for communication. Today I needed to find a way to submit changes to the datasource from within theses businessobjects in the most simple and performant way.

Luckily I designed my businessobjects so that a copy of a detached EF Entity was the base of these businessobjects. At first I tried to use the function ’Context.Attach( obj );‘ which sadly didn’t commit any changes.

A few moments of gathering informations via google I found a solution that worked for me :


using ( var context = new EntityContext( connectionstring ) )
{
   if ( detachedObject.EntityState == EntityState.Detached )
   {
      object original = null;
      if ( context.TryGetObjectByKey( detachedObject.EntityKey, out original ) )
      {
         context.ApplyCurrentValues<T>( context.T.EntitySet.Name, detachedObject );
      }
   }
}

I will write more about the structure of my businessobjects in the near future

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Filed under: Bachelor Thesis, C#, Databases, Entity Framework, Frameworks, MS Sql, Programming languages, Projekte, Studentenverwaltung (SV)