LINQ to DataTable,找到重复的行

var duplicates = from row in dataTable.AsEnumerable()
                 group row by new
                 {
                     Column1 = row.Field<string>("Column1"),
                     Column2 = row.Field<string>("Column2"),
                     // Add more columns as needed
                 } into g
                 where g.Count() > 1
                 select g.Key;

foreach (var duplicate in duplicates)
{
    Console.WriteLine($"Duplicate row: Column1 = {duplicate.Column1}, Column2 = {duplicate.Column2}");
}