GroupBy - Comparer, Mapped

public void Linq45()
{
    string[] anagrams = { "from   ", " salt", " earn ", "  last   ", " near ", " form  " };
      
    var orderGroups = anagrams.GroupBy(
                w => w.Trim(),
                a => a.ToUpper(),
                new AnagramEqualityComparer()
                );
      
    ObjectDumper.Write(orderGroups, 1);
}

public void DataSetLinq45()
{
    var anagrams = testDS.Tables["Anagrams"].AsEnumerable();
 
    var orderGroups = anagrams.GroupBy(
        w => w.Field("anagram").Trim(),
        a => a.Field("anagram").ToUpper(),
        new AnagramEqualityComparer()
        );
 
    foreach (var g in orderGroups)
    {
        Console.WriteLine("Key: {0}", g.Key);
        foreach (var w in g)
        {
            Console.WriteLine("\t" + w);
        }
    }
}

public class AnagramEqualityComparer : IEqualityComparer
{
    public bool Equals(string x, string y)
    {
        return getCanonicalString(x) == getCanonicalString(y);
    }
      
    public int GetHashCode(string obj)
    {
        return getCanonicalString(obj).GetHashCode();
    }
      
    private string getCanonicalString(string word)
    {
        char[] wordChars = word.ToCharArray();
        Array.Sort(wordChars);
        return new string(wordChars);
    }
}