Question

I have extension method that does something like this

public static void DoStuff(this ObjectContext context)
{
    using(var newContext = new MyEntitiesContext())
    {
        // do stuff
        newContext.SaveChanges();
    }
    context.SaveChanges();
}

I was wondering if there a way to new a context of the same type as the context passed in instead of specifying MyEntitiesContext?

Thanks in advance

Answer 1

If you don’t mind reflection:

var context = Activator.CreateInstance(context.GetType());

Now you either need a base Type or – if you still don’t mind reflection – you can simply call the method by name. Or, since you are using C#4 you could go with dynamic.

Edit: You could also Go this way:

public static void DoStuff<T>(this T context) where T : ObjectContext, new()
{
    using(var newContext = new T())
    {
         // do stuff
        newContext.SaveChanges();
    }
    context.SaveChanges();
}