对DataTable的DataRow做group

   1:  public void DataSetLinq41()

   2:  {

   3:      var words4 = testDS.Tables["Words4"].AsEnumerable();

   5:      var wordGroups =

   6:          from w in words4

   7:          group w by w.Field<string>("word")[0] into g

   8:          select new { FirstLetter = g.Key, Words = g };

  10:      foreach (var g in wordGroups)

  11:      {

  12:          Console.WriteLine("Words that start with the letter '{0}':", g.FirstLetter);

  13:          foreach (var w in g.Words)

  14:          {

  15:              Console.WriteLine(w.Field<string>("word"));

  16:          }

  17:      }

  18:      Console.ReadLine();

  19:  }

  20:   

  21:   

  22:  private static DataTable CreateWords4Table()

  23:  {

  24:      string[] words = { "blueberry", "chimpanzee", "abacus", "banana", "apple", "cheese" };

  25:      DataTable table = new DataTable("Words4");

  26:      table.Columns.Add("word", typeof(string));

  27:   

  28:      foreach (string word in words)

  29:      {

  30:          table.Rows.Add(new object[] { word });

  31:      }

  32:      return table;

  33:  }

  34:   

  35:  DataSetLinq41();