ASP.NET DataTable去掉重复行的2种方法

DataTable testtable = new DataTable();
 testtable.Columns.Add("ID");
 testtable.Columns.Add("ProductName");

 testtable.Rows.Add("1", "1");
 testtable.Rows.Add("1", "1");
 testtable.Rows.Add("1", "1");
 testtable.Rows.Add("2", "2");
 testtable.Rows.Add("3", "3");
 DataTable finalltable = new DataTable();
 finalltable = testtable.Clone();
 finalltable.Clear();
 
 var rows = from row in testtable.AsEnumerable() group row by row["ID"] into myrow select myrow.FirstOrDefault();
 foreach (DataRow row in rows)
 {
 finalltable.ImportRow(row);
 }

testtable = testtable.DefaultView.ToTable(true, new string[] { "ID", "ProductName" });