Question

Is there any way to to it without copying values?

Answer 1

Unfortunately the values will need to be copied, but DoubleCollection has a constructor that’ll do it automatically for you:

var foo = new double[] { 1.0, 2.5, 3.3, 4.1, 5.9 };
var bar = new DoubleCollection(foo);

EDIT…

You’ve specified that you’re using Silverlight, which means that there’s no such constructor available. In that case you’ll need to do all the work yourself (not that it actually requires much extra work):

var foo = new double[] { 1.0, 2.5, 3.3, 4.1, 5.9 };
var bar = new DoubleCollection();
foreach (double d in foo) bar.Add(d);

// or, if you prefer Array.ForEach to a foreach loop...
// Array.ForEach(foo, d => bar.Add(d));