Compare elements of the same list element

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I need to compare the same "PhoneNumber" attributes having the same "ID" for each element

XML

<List>
      <Connect ID="ID1" PhoneNumber="453585644878">
 
      </Connect>
      <Connect ID="ID1" PhoneNumber="453585644878">
 
      </Connect>
      <Connect ID="ID2" PhoneNumber="45655556658">
       </Connect>
      <Connect ID="ID2" PhoneNumber="96685688787">
      </Connect>
      <Connect ID="ID3" PhoneNumber="5766855577">
      </Connect>
      <Connect ID="ID3" PhoneNumber="8565657787">
      </Connect>
      <Connect ID="ID3" PhoneNumber="4565775235">
      </Connect>
      <Connect ID="ID4" PhoneNumber="44545454545">
      </Connect>
 </List>

for example in , the first two connect equivalent phone numbers and in the other non-equivalent numbers.

What I have tried:

C#

var xElementConnectiveList = xdoc.Descendants("List").Descendants("Connect ").ToList();


           var groupconnective = from xElementConnective in xElementConnectiveList
                                       group xElementConnective.Attribute("ID").Value by xElementConnective.Attribute("ID").Value into xElementConnectiveGroup
                                       orderby xElementConnectiveGroup.Key
                                       select xElementConnectiveGroup.Key;

Posted 23-Aug-22 2:51am

.Net Perfect Dev

Updated 23-Aug-22 3:19am

PIEBALDconsult

v2

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Richard Deeming · Answer 1 · 2022-08-23T03:19:00

Seems simple enough:

C#

var connectElements = xdoc.Descendants("List").Descendants("Connect");

var groupedElements = from el in connectElements
                      group el by el.Attribute("ID").Value into g
                      select g;

foreach (IGrouping<string, XElement> group in groupedElements)
{
    var telephoneNumbers = new HashSet<string>(group.Select(el => el.Attribute("PhoneNumber").Value), StringComparer.Ordinal);
    if (telephoneNumbers.Count == 1)
    {
        Console.WriteLine("{0}: All numbers match.", group.Key);
    }
    else
    {
        Console.WriteLine("{0}: Found {1} different numbers.", group.Key, telephoneNumbers.Count);
    }
}

Output:

ID1: All numbers match.
ID2: Found 2 different numbers.
ID3: Found 3 different numbers.
ID4: All numbers match.