LINQ to XML

Question

Hello!
Help me please)
 why it is impossible to make group by attribute of xml file:


XElement po1 = XElement.Load(sourseFile);
IEnumerable<XElement> childElements1 = from el in po1.Elements("ROW") select el;
var query = childElements1.GroupBy(row => row.Attribute("Atr"));
foreach (var item in query)
            {  textBox2.AppendText("Group key = " + item.Key + " \r\n");
                foreach (var inner in item)
                {
                    textBox2.AppendText("inner.Value = " + inner.Attribute("Sl") + " \r\n");
               
                }
                                 
            }


Thanks!

Answer 1

Сделайте преобразование в строки:row.Attribute( "Atr2" ) .ToString()) ;

Answer 2

Видимо проблема решена:Vingrad