Question

I’ve imported a DataTable from a SQL Database using SqlDataAdapter and Fill-Method.

My datatable looks like this:

Timestamp(unix time) | Value

          x          |    10
          x          |    42
          x          |   643
          y          |     5
          y          |     9
          y          |    70

…and so on. The table contains a lot of values (1000+) but has always three rows with the same timestamp.

Now I want it to look like this:

Timestamp(unix time) | Value 1 | Value 2 | Value 3

       x             |   10    |    42   |   643
       y             |    5    |     9   |    70

How can I sort it this way?

(If there are more than three values, the programm should just insert the first three values it has found)

Thanks for any help!

Answer 1

Thanks for your approach! I solved it myself now.

This is how I’ve done it:

var grouped = from myRow in myDataTable.AsEnumerable()
              group myRow by myRow.Field<int>("TIMESTAMP");

foreach (var timestamp in grouped)
{
    string[] myRow = new string[5];
    myRow[0] = timestamp.Key.ToString();

    int i = 1;
    foreach (var value in timestamp)
    {
      myRow[i] = value.Field<double>("VALUE").ToString();
      i++;
      if (i > 4)
          break;
    }

    mySortedTable.Rows.Add(myRow);
}