public void ContainsValue2()
{
var arr = new Dictionary<int,int>
{
{ 1, 1 },
{ 2, 2 },
};
ForEachProvider(db => AreEqual(
from p in Parent where arr.ContainsValue(p.ParentID) select p,
from p in db.Parent where arr.ContainsValue(p.ParentID) select p));
}