iTextSharp - very large table memory leak

问题

I have a SqlDataReader reading a large record set (1M records approx.) and I'm trying to export it to a PDF document using iTextSharp. This is my code:

 if (reader.HasRows)
 {
    int rowNum = 0;
    while (reader.Read())
    {
       if (rowNum % 2 == 1)
          datatable.DefaultCell.GrayFill = 0.8f;
       else
          datatable.DefaultCell.GrayFill = 0.95f;
       if (meRes.Trans(Lang, "Dir", CompanyID).ToUpper() == "RTL")
          for (int i = reader.FieldCount - 1; i >= 0; i--)
          {
             object o = reader[i];
             datatable.AddCell(new Phrase(o.ToString(), fntList));
          }
       else
          for (int i = 0; i < reader.FieldCount; i++)
             {
                object o = reader[i];
                datatable.AddCell(new Phrase(o.ToString(), fntList));
             }
       rowNum++;
   }
    myDocument.Add(datatable);
 }

When I run this, it causing a terrible memory leak. What can I do differently to improve this?

回答1:

You can set the number of rows per page to reduce the memory pressure

if (rowNum>0 && table1.Rows.Count % 7 == 0) // 7 = number of rows per page
{
   pdfDoc.Add(table1);
   table1.DeleteBodyRows(); // free resources
   pdfDoc.NewPage();
}

来源：https://stackoverflow.com/questions/14101142/itextsharp-very-large-table-memory-leak