Access DataContext behind IQueryable

Question

Is it possible to access the DataContext object behind an IQueryable?

If so, how?

Answer 1

DataContext is specific to LINQ to SQL, so presumably you're talking about LINQ to SQL queries? If so, there's no safe way to do this - you have to resort to a hack such as using reflection to retrieve the private "context" field of the underlying DataQuery object:

static DataContext GetContext (IQueryable q)
{
  if (!q.GetType().FullName.StartsWith ("System.Data.Linq.DataQuery`1")) return null;
  var field = q.GetType().GetField ("context", BindingFlags.NonPublic | BindingFlags.Instance);
  if (field == null) return null;
  return field.GetValue (q) as DataContext;
}