我使用itextsharp将大量数据导出近50,000 - 60,000条记录到pdf，但它给我的内存溢出异常和性能太慢了。任何人都可以帮我解决这个问题吗？我的代码是如下所示
Document doc = new Document(PageSize.A4, 10, 10, 40, 35);
MemoryStream ms = new MemoryStream();
string path = System.Web.Configuration.WebConfigurationManager.AppSettings["AllotmentExportFilePath"];
String FilePath = path + "TestPdf.pdf";
if (File.Exists(FilePath))
{
File.Delete(FilePath);
}
PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(FilePath, FileMode.Create));
writer.InitialLeading = 0;
//writer.CloseStream = false;
DataTable dt1 = ds.Tables[0];
DataTable dt2 = ds.Tables[1];
DataTable dt3 = ds.Tables[2];
DataTable newDt2 = new DataTable();
DataTable newDt3 = new DataTable();
UserSession OUser = (UserSession)HttpContext.Current.Session["User"];
string wtUnit = OUser.UserWeightAbbriviation;
string volUnit = OUser.UserVolumeAbbriviation;
string userRevenueUnit = (OUser.UserCurrencyID == null ? OUser.BUCurrencyAbbriviation : OUser.UserCurrencyAbbriviation);
// var colWidthPercentages = new[] { 6f, 10f, 10f, 10f, 20f, 20f, 8f, 8f, 8f };
// table.SetWidths(colWidthPercentages);
var normalFont = FontFactory.GetFont(FontFactory.TIMES, 6);
var boldFont = FontFactory.GetFont(FontFactory.TIMES_BOLD, 6);
doc.Open();
PdfPTable table = new PdfPTable(dt1.Columns.Count - 1) { WidthPercentage = 100 };
table.SplitLate = false;
for (int j = 0; j < dt1.Columns.Count; j++)
{
if (dt1.Columns[j].ColumnName == "Req_Id")
continue;
if (dt1.Columns[j].ColumnName == "Wt")
table.AddCell(new Phrase((dt1.Columns[j].ColumnName).Replace("_", " ") + " (" + wtUnit + ")", boldFont));
else if (dt1.Columns[j].ColumnName == "Vol")
table.AddCell(new Phrase((dt1.Columns[j].ColumnName).Replace("_", " ") + " (" + volUnit + ")", boldFont));
else if (dt1.Columns[j].ColumnName == "Rate" || dt1.Columns[j].ColumnName == "Bid_Price")
table.AddCell(new Phrase((dt1.Columns[j].ColumnName).Replace("_", " ") + " (" + userRevenueUnit + ") /(" + OUser.UserWeightAbbriviation + ")", boldFont));
else if (dt1.Columns[j].ColumnName == "ULD_No")
table.AddCell(new Phrase(dt1.Columns[j].ColumnName.Replace("_No", " #"), boldFont));
else if (dt1.Columns[j].ColumnName == "Release_Per")
table.AddCell(new Phrase(dt1.Columns[j].ColumnName.Replace("_Per", " (%)"), boldFont));
else
table.AddCell(new Phrase(dt1.Columns[j].ColumnName.Replace("_", " "), boldFont));
}
if (dt1.Rows.Count >= 1 && !String.IsNullOrEmpty(Convert.ToString(dt1.Rows[0][0])))
{
for (int i = 0; i < dt1.Rows.Count; i++)
{
PdfPCell[] cell = new PdfPCell[dt1.Columns.Count - 1];
int colRequest = 0;
for (int j = 0; j < dt1.Columns.Count; j++)
{
if (j == 0)
continue;
cell[colRequest] = new PdfPCell(new Phrase(dt1.Rows[i][j].ToString(), normalFont));
colRequest = colRequest + 1;
}
PdfPRow row = new PdfPRow(cell);
table.Rows.Add(row);
PdfPTable table1 = new PdfPTable(dt2.Columns.Count - 2) { WidthPercentage = 100 };
//var colWidthPercentages = new[] { 6f, 10f, 10f, 10f, 5f, 20f, 8f, 8f, 8f };
//table1.SetWidths(colWidthPercentages);
var rows = (from bb in dt2.AsEnumerable()
where (bb.Field<string>("Request_ID") == Convert.ToString(dt1.Rows[i]["Req_Id"]))
select bb);
for (int k = 0; k < dt2.Columns.Count; k++)
{
if (dt2.Columns[k].ColumnName == "Request_ID" || dt2.Columns[k].ColumnName == "Path_ID")
continue;
if (dt2.Columns[k].ColumnName == "Rec_Wt_Model" || dt2.Columns[k].ColumnName == "Rec_Wt_User")
table1.AddCell(new Phrase(dt2.Columns[k].ColumnName.Replace("_", " ") + " (" + wtUnit + ")", boldFont));
else if (dt2.Columns[k].ColumnName == "Rec_Vol_Model" || dt2.Columns[k].ColumnName == "Rec_Vol_User")
table1.AddCell(new Phrase(dt2.Columns[k].ColumnName.Replace("_", " ") + " (" + volUnit + ")", boldFont));
else if (dt2.Columns[k].ColumnName == "Route_Cost")
table1.AddCell(new Phrase(dt2.Columns[k].ColumnName.Replace("_", " ") + " (" + userRevenueUnit + ") /(" + OUser.UserWeightAbbriviation + ")", boldFont));
else
table1.AddCell(new Phrase(dt2.Columns[k].ColumnName.Replace("_", " "), boldFont));
}
if (rows.Count() > 0)
{
newDt2 = rows.CopyToDataTable();
for (int i1 = 0; i1 < newDt2.Rows.Count; i1++)
{
PdfPCell[] Innercell = new PdfPCell[newDt2.Columns.Count - 2];
int colRoute = 0;
for (int j1 = 0; j1 < newDt2.Columns.Count; j1++)
{
if (j1 == 0 || j1 == 1)
continue;
Innercell[colRoute] = new PdfPCell(new Phrase(newDt2.Rows[i1][j1].ToString(), normalFont));
colRoute = colRoute + 1;
}
PdfPRow Innerrow = new PdfPRow(Innercell);
table1.Rows.Add(Innerrow);
PdfPTable table2 = new PdfPTable(dt3.Columns.Count - 2) { WidthPercentage = 100 };
var rows1 = (from bb in dt3.AsEnumerable()
where (bb.Field<string>("Request_ID") == Convert.ToString(newDt2.Rows[i1]["Request_ID"])
&& bb.Field<string>("Path_ID") == Convert.ToString(newDt2.Rows[i1]["Path_ID"]))
select bb);
for (int k = 0; k < dt3.Columns.Count; k++)
{
if (dt3.Columns[k].ColumnName == "Request_ID" || dt3.Columns[k].ColumnName == "Path_ID")
continue;
if (dt3.Columns[k].ColumnName == "Flt_No")
table2.AddCell(new Phrase(dt3.Columns[k].ColumnName.Replace("_No", " #"), boldFont));
else
table2.AddCell(new Phrase(dt3.Columns[k].ColumnName.Replace("_", " "), boldFont));
}
if (rows1.Count() > 0)
{
newDt3 = rows1.CopyToDataTable();
for (int i2 = 0; i2 < newDt3.Rows.Count; i2++)
{
PdfPCell[] Innercell1 = new PdfPCell[newDt3.Columns.Count - 2];
int colLeg = 0;
for (int j2 = 0; j2 < newDt3.Columns.Count; j2++)
{
if (j2 == 0 || j2 == 1)
continue;
Innercell1[colLeg] = new PdfPCell(new Phrase(newDt3.Rows[i2][j2].ToString(), normalFont));
colLeg = colLeg + 1;
}
PdfPRow Innerrow1 = new PdfPRow(Innercell1);
table2.Rows.Add(Innerrow1);
}
}
else
{
string rowData = "No child records to display.";
PdfPCell[] NoRowcell = new PdfPCell[dt3.Columns.Count - 2];// (new Phrase(rowData));
// NoRowcell[0] = new PdfPCell(table) { Colspan = newDt2.Columns.Count - 2 };
NoRowcell[0] = new PdfPCell(new Phrase(rowData, normalFont)) { Colspan = dt3.Columns.Count - 2 };
PdfPRow Norow = new PdfPRow(NoRowcell);
table2.Rows.Add(Norow);
}
PdfPCell[] Rowcell1 = new PdfPCell[dt2.Columns.Count - 2];
Rowcell1[0] = new PdfPCell(table2) { Colspan = dt3.Columns.Count - 2 };
//int diff1 = (dt2.Columns.Count - 2) - (dt3.Columns.Count - 2);
//if (diff1 > 0)
//{
// Rowcell1[dt3.Columns.Count - 2] = new PdfPCell() { Colspan = 6 };
// //for (var l = newDt3.Columns.Count-2; l < dt2.Columns.Count-2; l++)
// //{
// // Rowcell1[l] = new PdfPCell();
// //}
//}
PdfPRow row11 = new PdfPRow(Rowcell1);
table1.Rows.Add(row11);
}
}
else
{
string rowData = "No child records to display.";
PdfPCell[] Rowcell1 = new PdfPCell[dt2.Columns.Count - 2];// (new Phrase(rowData));
Rowcell1[0] = new PdfPCell(new Phrase(rowData, normalFont)) { Colspan = dt2.Columns.Count - 2 };
PdfPRow row11 = new PdfPRow(Rowcell1);
table1.Rows.Add(row11);
}
PdfPCell[] Rowcell = new PdfPCell[dt1.Columns.Count - 1];
Rowcell[0] = new PdfPCell(table1) { Colspan = dt2.Columns.Count - 2 };
int diff = (dt1.Columns.Count - 1) - (dt2.Columns.Count - 2);
if (diff > 0)
{
Rowcell[dt2.Columns.Count - 2] = new PdfPCell() { Colspan = diff };
//for (var l = newDt2.Columns.Count-2; l < dt1.Columns.Count-1; l++)
//{
// Rowcell[l] = new PdfPCell();
//}
}
PdfPRow row1 = new PdfPRow(Rowcell);
table.Rows.Add(row1);
}
}
else
{
string rowData = "No records to display.";
PdfPCell[] Rowcell1 = new PdfPCell[dt1.Columns.Count - 2];// (new Phrase(rowData));
Rowcell1[0] = new PdfPCell(new Phrase(rowData, normalFont)) { Colspan = dt1.Columns.Count - 2 };
PdfPRow row11 = new PdfPRow(Rowcell1);
table.Rows.Add(row11);
}
doc.Add(table);
doc.Close();