Excel c# 操作

1.直接导出数据控件保存方法

private void ExportToExcel()
{
if(Session["OBData"] != null && Session["OBTotal"] != null)
{
DataTable dt = (DataTable)Session["OBData"]; // datatable
DataTable dt_total = (DataTable)Session["OBTotal"]; // total table
// Populate the repeater control with the Items DataSet
if (dt_total != null && dt_total.Rows.Count > 0)
{
this.TotalCompanyQtyOnhand = string.Format("{0:N0}", dt_total.Rows[0]["TotalCompanyQtyOnhand"]);
this.TotalCompanyExt = string.Format("{0:N}", dt_total.Rows[0]["TotalCompanyExt"]);
this.TotalLCMReserve = string.Format("{0:N}", dt_total.Rows[0]["TotalLCMReserve"]);
this.TotalEFCQty = string.Format("{0:N0}", dt_total.Rows[0]["TotalEFCQty"]);
this.TotalCFCQty = string.Format("{0:N0}", dt_total.Rows[0]["TotalCFCQty"]);
this.TotalWFCQty = string.Format("{0:N0}", dt_total.Rows[0]["TotalWFCQty"]);
this.TotalEFCExt = string.Format("{0:N}", dt_total.Rows[0]["TotalEFCExt"]);
this.TotalCFCExt = string.Format("{0:N}", dt_total.Rows[0]["TotalCFCExt"]);
this.TotalWFCExt = string.Format("{0:N}", dt_total.Rows[0]["TotalWFCExt"]);
this.TotalStoreExt = string.Format("{0:N}", dt_total.Rows[0]["TotalStoreExt"]);
this.TotalStoreQty = string.Format("{0:N0}", dt_total.Rows[0]["TotalStoreQty"]);
}

if (dt != null && dt.Rows.Count > 0)
{
this.ReportRepeater.DataSource = dt;
this.ReportRepeater.DataBind();
}
}
if (Session["OBSummary"] != null)
{
this.BindSummaryRow((DataTable)Session["OBSummary"]);
}
string attachment = "attachment; filename=InventoryObsSkuReport_" + DateTime.Now.ToShortDateString().Replace("/", "") + ".xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/ms-excel";
StringWriter stringWriter = new StringWriter();
HtmlTextWriter htmlTextWriter = new HtmlTextWriter(stringWriter);
this.SummaryRow.RenderControl(htmlTextWriter);
this.ReportRepeater.RenderControl(htmlTextWriter);
Response.Write(stringWriter.ToString());
Response.End();
}

这种SIZE比较大，数据大时会内存会溢出。

2.读取数据拼凑方法再抛出保存

private void ExportToExcel()
{
string sql = "exec Report_Inventory @Date='" + Request.Params["date"] + "',@sku='" + Request.Params["sku"] + "',@vendornumber='" + Request.Params["vendornumber"] + "',@WHView='R',@PageNum='-1',@categoryid='" + Request.Params["categoryid"] + "'";
DataSet ds = Suryani.Util.DBService.GetDataSet(sql);
string sqlR = "exec GetNotInReceivings @date='" + Request.Params["date"] + "',@sku='" + Request.Params["sku"] + "',@vendornumber='" + Request.Params["vendornumber"] + "',@WHView='R',@categoryid='" + Request.Params["categoryid"] + "'";
DataSet ds_notIn = Suryani.Util.DBService.GetDataSet(sqlR);
StringBuilder sb = new StringBuilder();
if (ds != null && ds.Tables.Count == 4)
{
DataTable dt_wh = ds.Tables[0];
DataTable dt_Sku = ds.Tables[1];
DataTable dt_data = ds.Tables[2];
DataTable dt_sum = ds.Tables[3];
DataTable dtnot_s = null;
DataTable dtnot_d = null;

if (dt_wh != null && dt_wh.Rows.Count > 0)
{
// table header
sb.Append("<table cellspacing=\"0\" rules=\"all\" bordercolor=\"Gray\" border=\"1\" style=\"background-color:White;border-color:Gray;width:100%;border-collapse:collapse;\">");
sb.Append("<tr class=\"ShoppingCartHeader\">");
sb.Append("<td colspan=\"4\"></td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
sb.Append("<td align=\"center\" colspan=\"3\"><b>" + key + "</b></td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
}
sb.Append("<td align=\"center\" colspan=\"3\"><b>Total</b></td>");
sb.Append("</tr>");

// header2
sb.Append("<tr class=\"ShoppingCartHeader\">");
sb.Append("<td>SKU</td>");
sb.Append("<td colspan=\"\">Description</td>");
sb.Append("<td style=\"white-space:nowrap\"><b>Related Skus</b></td>");
sb.Append("<td><b>Category</b></td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");

foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
sb.Append("<td align=\"center\"><b>Qty</b></td><td align=\"center\"><b>Cost</b></td><td align=\"center\"><b>Extended</b></td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
}
sb.Append("<td align=\"center\"><b>Qty</b></td><td align=\"center\"><b>Cost</b></td><td align=\"center\"><b>Extended</b></td>");
sb.Append("</tr>");

DataRow[] drs_D;
// data part
if (dt_Sku != null && dt_Sku.Rows.Count > 0)
{
foreach (DataRow dr in dt_Sku.Rows)
{
sb.Append("<tr>");
sb.Append("<td style=\"white-space:nowrap\"><a href=\"" + GetSkuLink2(dr["sku"].ToString()) + "\">" + dr["sku"].ToString() + "</a></td>");
sb.Append("<td style=\"white-space:nowrap\">" + dr["des"].ToString() + "</td>");
sb.Append("<td style=\"white-space:nowrap\">" + dr["relatedskus"].ToString() + "</td>");
sb.Append("<td style=\"white-space:nowrap\">" + dr["categoryname"].ToString() + "</td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");

foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();

drs_D = dt_data.Select("warehousecode='" + key + "' and sku='" + dr["sku"].ToString() + "'");
if (drs_D != null && drs_D.Length > 0)
{
sb.Append("<td align=\"center\">" + string.Format("{0:N0}", drs_D[0]["Qty"]) + "</td><td align=\"center\"><a href=\"" + GetCostLink2(dr["sku"].ToString(), " + key + ", dr["basesku"].ToString()) + "\">" + string.Format("{0:N2}", drs_D[0]["Cost"]) + "</a></td><td align=\"center\">" + string.Format("{0:N2}", drs_D[0]["extended"]) + "</td>");
}
else
{
sb.Append("<td align=\"center\"></td><td align=\"center\"></td><td align=\"center\"></td>");
}
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
}

sb.Append("<td align=\"center\">" + string.Format("{0:N0}", dr["TotalQty"]) + "</td><td align=\"center\">" + string.Format("{0:N2}", dr["TotalCost"]) + "</td><td align=\"right\">" + string.Format("{0:N2}", dr["Totalext"]) + "</td>");
sb.Append("</tr>");
}
}

// sub total row
int totalqty = 0, tQty = 0;
double totalExt = 0, tExt = 0;
if (dt_sum != null && dt_sum.Rows.Count > 0)
{
sb.Append("<tr>");
sb.Append("<td><b>Subtotal:</b></td><td colspan=\"3\"></td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
drs_D = dt_sum.Select("warehousecode='" + key + "'");
if (drs_D != null && drs_D.Length > 0)
{
sb.Append("<td align=\"center\">" + string.Format("{0:N0}", drs_D[0]["TotalQty"]) + "</td><td align=\"center\"></td><td align=\"center\">" + string.Format("{0:N2}", drs_D[0]["Totalextended"]) + "</td>");
try
{
tQty = int.Parse(drs_D[0]["TotalQty"].ToString());
tExt = double.Parse(drs_D[0]["Totalextended"].ToString());
totalqty = totalqty + tQty;
totalExt = totalExt + tExt;
}
catch { }
}
else
{
sb.Append("<td align=\"center\"></td><td align=\"center\"></td><td align=\"center\"></td>");
}

sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");

}
sb.Append("<td align=\"center\">" + string.Format("{0:N0}", totalqty) + "</td><td align=\"center\"></td><td align=\"right\">" + string.Format("{0:N2}", totalExt) + "</td>");
sb.Append("</tr>");
}

int whNum = dt_wh.Rows.Count;
int ColSpanNum = 14 + whNum * 3;
sb.Append("<tr><td colspan=\"" + ColSpanNum.ToString() + "\"> </td></tr>");
sb.Append("<tr><td colspan=\"2\"><b>Trucks Arrived but not Received In:</b></td>");
sb.Append("<td align=\"center\"><b>Truck ARR Date</b></td>");
sb.Append("<td align=\"center\"><b>Receive Date</b></td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
int tempNum = ColSpanNum - 5;
sb.Append("<td colspan=\"" + tempNum.ToString() + "\"></tr>");

// not in
if (ds_notIn != null && ds_notIn.Tables.Count == 2)
{
dtnot_d = ds_notIn.Tables[0]; // data
dtnot_s = ds_notIn.Tables[1]; // subtotal
// data
if (dtnot_d != null && dtnot_d.Rows.Count > 0)
{
foreach (DataRow dr in dtnot_d.Rows)
{
double ext = 0;
sb.Append("<tr>");
sb.Append("<td style=\"white-space:nowrap\"><a href=\"" + GetReceiveLink(dr["receivedid"].ToString().Trim(), dr["po_id"].ToString().Trim(), dr["ReceiveNumber"].ToString().Trim()) + "\" Target=\"_blank\">" + dr["ReceiveNumber"].ToString() + "</a></td>");
sb.Append("<td style=\"white-space:nowrap\">" + dr["vendorname"].ToString() + "</td>");
sb.Append("<td style=\"white-space:nowrap\" align=\"right\">" + string.Format("{0:d}", dr["TruckArriveDate"]) + "</td>");
sb.Append("<td style=\"white-space:nowrap\" align=\"right\">" + string.Format("{0:d}", dr["ReceiveDate"]) + "</td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");

foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
if (dr["warehousecode"].ToString().Trim().ToUpper() == key.ToUpper().Trim())
{

sb.Append("<td colspan=\"3\" align=\"right\">" + string.Format("{0:N2}", dr["InvoiceAmount"]) + "</td>");
try { ext = double.Parse(dr["InvoiceAmount"].ToString()); }
catch { }
}
else
{
sb.Append("<td colspan=\"3\"> </td>");
}
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
}

sb.Append("<td colspan=\"3\" align=\"right\">" + string.Format("{0:N2}", ext) + "</td>");
sb.Append("</tr>");
}
}

// summary row in Not in
if (dtnot_s != null && dtnot_s.Rows.Count > 0)
{
tExt = 0;
totalExt = 0;
sb.Append("<tr>");
sb.Append("<td><b>Subtotal:</b></td><td colspan=\"3\"><b></b></td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
drs_D = dtnot_s.Select("warehousecode='" + key + "'");
if (drs_D != null && drs_D.Length > 0)
{
sb.Append("<td align=\"right\" colspan=\"3\">" + string.Format("{0:N2}", drs_D[0]["Totalext"]) + "</td>");
try
{
tExt = double.Parse(drs_D[0]["Totalext"].ToString());
totalExt = totalExt + tExt;
}
catch { }
}
else
{
sb.Append("<td align=\"center\" colspan=\"3\"></td>");
}

sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
}
sb.Append("<td align=\"right\" colspan=\"3\">" + string.Format("{0:N2}", totalExt) + "</td>");
sb.Append("</tr>");
}
sb.Append("<tr><td colspan=\"" + ColSpanNum.ToString() + "\"> </td></tr>");
}

// Grand TotalInvetory
double totalLocExt = 0, totalSum = 0;
totalExt = 0;
sb.Append("<tr>");
sb.Append("<td colspan=\"4\"><b>Total Inventory:</b></td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
totalLocExt = 0; totalSum = 0;

if (dtnot_s != null && dtnot_s.Rows.Count > 0)
{
drs_D = dtnot_s.Select("warehousecode='" + key + "'");
if (drs_D != null && drs_D.Length > 0)
{
try
{
totalLocExt = double.Parse(drs_D[0]["Totalext"].ToString());
}
catch
{
totalLocExt = 0;
}
totalExt = totalExt + totalLocExt;
}
}
if (dt_sum != null && dt_sum.Rows.Count > 0)
{
drs_D = dt_sum.Select("warehousecode='" + key + "'");
if (drs_D != null && drs_D.Length > 0)
{
try
{
totalSum = double.Parse(drs_D[0]["Totalextended"].ToString());
}
catch
{
totalSum = 0;
}
totalExt = totalExt + totalSum;
}
}
sb.Append("<td align=\"right\" colspan=\"3\">" + string.Format("{0:N2}", totalLocExt + totalSum) + "</td>");
sb.Append("<td width=\"2\" bgcolor=\"Gray\"></td>");
}

sb.Append("<td align=\"right\" colspan=\"3\"><b>" + string.Format("{0:N2}", totalExt) + "</b></td>");
sb.Append("</tr></table>");

//this.StrSpan.InnerHtml = sb.ToString();

}
}

string attachment = "attachment; filename=InventoryReport_" + DateTime.Now.ToShortDateString().Replace("/", "") + ".xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.Write(sb.ToString());
Response.End();
}
private void ExportToExcel3()
{

string sql = "exec Report_Inventory @Date='" + Request.Params["date"] + "',@sku='" + Request.Params["sku"] + "',@vendornumber='" + Request.Params["vendornumber"] + "',@WHView='R',@PageNum='-1',@categoryid='" + Request.Params["categoryid"] + "',@CataLogId='" + Request.Params["CataLogId"] + "'";
DataSet ds = Suryani.Util.DBService.GetDataSet(sql);
string sqlR = "exec GetNotInReceivings @date='" + Request.Params["date"] + "',@sku='" + Request.Params["sku"] + "',@vendornumber='" + Request.Params["vendornumber"] + "',@WHView='R',@categoryid='" + Request.Params["categoryid"] + "',@CataLogId='" + Request.Params["CataLogId"] + "'";
DataSet ds_notIn = Suryani.Util.DBService.GetDataSet(sqlR);
if (ds != null && ds.Tables.Count == 4)
{
StringBuilder sbhearder = new StringBuilder();
System_Manager System_Manager = new System_Manager();
string _path = System_Manager.GetSystemConfiguration("InventoryReportExportPath");//"\\\\Fs1\\prod-storage\\apps\\InventoryReport\\";
string filename = "InventoryReportSKU_RegionView_" + DateTime.Now.Date.ToShortDateString().Replace("/", "") + "_" + DateTime.Now.Millisecond.ToString() + "_" + User.Identity.Name.Replace(",", "") + ".CSV";
System.IO.StreamWriter tw = new System.IO.StreamWriter(System.IO.File.Open(_path + filename, System.IO.FileMode.CreateNew, System.IO.FileAccess.Write));
DataTable dt_wh = ds.Tables[0];
DataTable dt_Sku = ds.Tables[1];
DataTable dt_data = ds.Tables[2];
DataTable dt_sum = ds.Tables[3];
DataTable dtnot_s = null;
DataTable dtnot_d = null;

if (dt_wh != null && dt_wh.Rows.Count > 0)
{
// table header
sbhearder.Append(",,,,,");
sbhearder.Append(",");
foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
sbhearder.Append("," + key + ",,");
sbhearder.Append(",");
}
sbhearder.Append(",Total,,");
sbhearder.Append("\r\n");

// header2
sbhearder.Append("SKU,");
sbhearder.Append("Description,");
sbhearder.Append("Related Skus,");
sbhearder.Append("Category,");
sbhearder.Append("Catalog,");
sbhearder.Append(",");

foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
sbhearder.Append("Qty,Cost,Extended,");
sbhearder.Append(",");
}
sbhearder.Append("Qty,Cost,Extended,");
sbhearder.Append("\r\n");
tw.Write(sbhearder.ToString());

DataRow[] drs_D;
// data part
if (dt_Sku != null && dt_Sku.Rows.Count > 0)
{
StringBuilder sbskudata = new StringBuilder();
int skuindex = 0;
int index=0;
int skucount=dt_Sku.Rows.Count;
foreach (DataRow dr in dt_Sku.Rows)
{
sbskudata.Append(dr["sku"].ToString() + ",");
sbskudata.Append(dr["des"].ToString().Replace(",", " ") + ",");
sbskudata.Append(dr["relatedskus"].ToString().Replace(",", " ") + ",");
sbskudata.Append(dr["categoryname"].ToString().Replace(",", " ") + ",");
sbskudata.Append(dr["catalogname"].ToString().Replace(",", " ") + ",");
sbskudata.Append(",");

foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();

drs_D = dt_data.Select("warehousecode='" + key + "' and sku='" + dr["sku"].ToString() + "'");
if (drs_D != null && drs_D.Length > 0)
{
sbskudata.Append(drs_D[0]["Qty"].ToString() + "," + string.Format("{0:N2}", drs_D[0]["Cost"]).Replace(",", "") + "," + string.Format("{0:N2}", drs_D[0]["extended"]).Replace(",", "") + ",");
}
else
{
sbskudata.Append(",,,");
}
sbskudata.Append(",");
}

sbskudata.Append(dr["TotalQty"].ToString() + "," + string.Format("{0:N2}", dr["TotalCost"]).Replace(",", "") + "," + string.Format("{0:N2}", dr["Totalext"]).Replace(",", "") + ",");
sbskudata.Append("\r\n");
skuindex = skuindex + 1;
index=index+1;
if (skuindex == 1000 || index == skucount)
{
tw.Write(sbskudata.ToString());
skuindex = 0;
sbskudata = new StringBuilder();

}
}
}

// sub total row
StringBuilder sbskusubtotal = new StringBuilder();
int totalqty = 0, tQty = 0;
double totalExt = 0, tExt = 0;
if (dt_sum != null && dt_sum.Rows.Count > 0)
{
sbskusubtotal.Append("Subtotal:,,,,,");
sbskusubtotal.Append(",");
foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
drs_D = dt_sum.Select("warehousecode='" + key + "'");
if (drs_D != null && drs_D.Length > 0)
{
sbskusubtotal.Append(drs_D[0]["TotalQty"].ToString() + ",," + string.Format("{0:N2}", drs_D[0]["Totalextended"]).Replace(",", "") + ",");
try
{
tQty = int.Parse(drs_D[0]["TotalQty"].ToString());
tExt = double.Parse(drs_D[0]["Totalextended"].ToString());
totalqty = totalqty + tQty;
totalExt = totalExt + tExt;
}
catch { }
}
else
{
sbskusubtotal.Append(",,,");
}

sbskusubtotal.Append(",");

}
sbskusubtotal.Append(totalqty.ToString() + ",," + string.Format("{0:N2}", totalExt).Replace(",", "") + ",");
sbskusubtotal.Append("\r\n");
tw.Write(sbskusubtotal.ToString());
}
StringBuilder sbskunothearder = new StringBuilder();
int whNum = dt_wh.Rows.Count;
int ColSpanNum = 14 + whNum * 3;
for (int i = 0; i < ColSpanNum; i++) { sbskunothearder.Append(","); }
sbskunothearder.Append("\r\n");
sbskunothearder.Append("Trucks Arrived but not Received In:,,");
sbskunothearder.Append("Truck ARR Date,");
sbskunothearder.Append("Receive Date,");
sbskunothearder.Append(",");
int tempNum = ColSpanNum - 5;
for (int i = 0; i < tempNum; i++) { sbskunothearder.Append(","); }
sbskunothearder.Append("\r\n");
tw.Write(sbskunothearder.ToString());
// not in
if (ds_notIn != null && ds_notIn.Tables.Count == 2)
{
dtnot_d = ds_notIn.Tables[0]; // data
dtnot_s = ds_notIn.Tables[1]; // subtotal
// data
if (dtnot_d != null && dtnot_d.Rows.Count > 0)
{
StringBuilder sbskunotdata = new StringBuilder();
int skunotindex = 0;
int notindex = 0;
int notskucount = dtnot_d.Rows.Count;
foreach (DataRow dr in dtnot_d.Rows)
{
double ext = 0;
sbskunotdata.Append(dr["ReceiveNumber"].ToString() + ",");
sbskunotdata.Append(dr["vendorname"].ToString().Replace(",", " ") + ",");
sbskunotdata.Append(string.Format("{0:d}", dr["TruckArriveDate"]) + ",");
sbskunotdata.Append(string.Format("{0:d}", dr["ReceiveDate"]) + ",");
sbskunotdata.Append(",");
sbskunotdata.Append(",");
foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
if (dr["warehousecode"].ToString().Trim().ToUpper() == key.ToUpper().Trim())
{

sbskunotdata.Append(",," + dr["InvoiceAmount"].ToString() + ",");
try { ext = double.Parse(dr["InvoiceAmount"].ToString()); }
catch { }
}
else
{
sbskunotdata.Append(",,,");
}
sbskunotdata.Append(",");
}

sbskunotdata.Append(",," + string.Format("{0:N2}", ext).Replace(",", "") + ",");
sbskunotdata.Append("\r\n");
skunotindex = skunotindex + 1;
notindex = notindex + 1;
if (skunotindex == 1000 || notindex == notskucount)
{
tw.Write(sbskunotdata.ToString());
skunotindex = 0;
sbskunotdata = new StringBuilder();

}
}
}

// summary row in Not in
StringBuilder sbskunotsummary = new StringBuilder();
if (dtnot_s != null && dtnot_s.Rows.Count > 0)
{
tExt = 0;
totalExt = 0;
sbskunotsummary.Append("Subtotal:,,,,,");
sbskunotsummary.Append(",");
foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
drs_D = dtnot_s.Select("warehousecode='" + key + "'");
if (drs_D != null && drs_D.Length > 0)
{
sbskunotsummary.Append(",," + string.Format("{0:N2}", drs_D[0]["Totalext"]).Replace(",", "") + ",");
try
{
tExt = double.Parse(drs_D[0]["Totalext"].ToString());
totalExt = totalExt + tExt;
}
catch { }
}
else
{
sbskunotsummary.Append(",,,");
}

sbskunotsummary.Append(",");
}
sbskunotsummary.Append(",," + string.Format("{0:N2}", totalExt).Replace(",", "") + ",");
sbskunotsummary.Append("\r\n");
}
for (int i = 0; i < ColSpanNum; i++) { sbskunotsummary.Append(","); }
sbskunotsummary.Append("\r\n");
tw.Write(sbskunotsummary.ToString());
}

// Grand TotalInvetory
StringBuilder sbtotal = new StringBuilder();
double totalLocExt = 0, totalSum = 0;
totalExt = 0;
sbtotal.Append("Total Inventory:,,,,,");
sbtotal.Append(",");
foreach (DataRow drw in dt_wh.Rows)
{
string key = drw["warehousecode"].ToString().Trim();
totalLocExt = 0; totalSum = 0;

if (dtnot_s != null && dtnot_s.Rows.Count > 0)
{
drs_D = dtnot_s.Select("warehousecode='" + key + "'");
if (drs_D != null && drs_D.Length > 0)
{
try
{
totalLocExt = double.Parse(drs_D[0]["Totalext"].ToString());
}
catch
{
totalLocExt = 0;
}
totalExt = totalExt + totalLocExt;
}
}
if (dt_sum != null && dt_sum.Rows.Count > 0)
{
drs_D = dt_sum.Select("warehousecode='" + key + "'");
if (drs_D != null && drs_D.Length > 0)
{
try
{
totalSum = double.Parse(drs_D[0]["Totalextended"].ToString());
}
catch
{
totalSum = 0;
}
totalExt = totalExt + totalSum;
}
}
sbtotal.Append(",," + string.Format("{0:N2}", totalLocExt + totalSum).Replace(",", "") + ",");
sbtotal.Append(",");
}

sbtotal.Append(",," + string.Format("{0:N2}", totalExt).Replace(",", "") + ",");
sbtotal.Append("\r\n");
tw.Write(sbtotal.ToString());
tw.Flush();
tw.Close();
tw = null;
this.Msg.Text = "The file is saved at " + _path + filename + ", please get form there.";
}
}

}

这个SIZE比上面的小点，而且EXCEL标题控制比较灵活，但一次写入文件中数据多也抗不住，可以分多次写缓解下。

3.把EXCEL当数据库操作

增删改查参考举例：

http://davidhayden.com/blog/dave/archive/2006/05/26/2973.aspx

批量处理链接

http://www.codeproject.com/Articles/17028/Bulk-Record-Insert-for-Access

这里有个问题就是这里把EXCEL当着表来处理，所以如果是多重标题就无法满足。

小知识点：

当产品文件无法让你生成EXCEL时，你可以在tmp目录下生成excel, 然后载入这个excel的内容输入到response让用户下载。