XElement xe = XElement.Load(stm); //Stm - Stream
var k = xe.Descendants("post").Select(r => (string)r.Attribute("file_url"));

if (!LoliGet.CancellationPending)
    try
    {
           k.AsParallel().WithDegreeOfParallelism(2).WithCancellation(this.CancelLoad.Token).ForAll(r =>
               {
                if (!LoliGet.CancellationPending)
            {
                    this.GetImage(r, ib.Name(r));
                }
               });
    }
    catch (OperationCanceledException ex)
    {
        }
        else
        return;