Acabo de encontrar esto:
http://support.microsoft.com/default.aspx?scid=kb;en-us;326176#1
Mientras buscas algo similar, solo, específicamente para .net 2.0
Supongo que el OP estaba buscando distinto mientras usaba DataTable.Select (). (Seleccionar () no admite distintos)
Así que aquí está el código del enlace anterior:
class DataTableHelper
{
public DataTable SelectDistinct(string TableName, DataTable SourceTable, string FieldName)
{
DataTable dt = new DataTable(TableName);
dt.Columns.Add(FieldName, SourceTable.Columns[FieldName].DataType);
object LastValue = null;
foreach (DataRow dr in SourceTable.Select("", FieldName))
{
if ( LastValue == null || !(ColumnEqual(LastValue, dr[FieldName])) )
{
LastValue = dr[FieldName];
dt.Rows.Add(new object[]{LastValue});
}
}
return dt;
}
private bool ColumnEqual(object A, object B)
{
// Compares two values to see if they are equal. Also compares DBNULL.Value.
// Note: If your DataTable contains object fields, then you must extend this
// function to handle them in a meaningful way if you intend to group on them.
if ( A == DBNull.Value && B == DBNull.Value ) // both are DBNull.Value
return true;
if ( A == DBNull.Value || B == DBNull.Value ) // only one is DBNull.Value
return false;
return ( A.Equals(B) ); // value type standard comparison
}
}