.net导出Excel几种方式比较

数据原共400条数据,21列,我是双核cpu,4G内存
1. Excel com组件
要3秒左右,上千条30秒+这种方法比较慢，要引用Microsoft.Office.Interop.Excel

#region DataSet导入到Excel里（最原始样式）
/// <summary>
/// DataSet导入到Excel里，多个DataTable分成多个Sheet,Sheet名以TableName命名
/// </summary>
/// <param name="DS">要导入的Excel</param>
/// <param name="FilePathAndName">要保存的路径和文件名（绝对路径)</param>
public static void DataSetToExcel(DataSet DS, string FilePathAndName)
{
string strName = FilePathAndName.Replace(@"\\", @"\").Replace(@"\\", @"\").Replace(@"\\", @"\");
strName = FilePathAndName;
Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
try
{
excel.Visible = false;
//设置禁止弹出保存和覆盖的询问提示框
excel.DisplayAlerts = false;
excel.AlertBeforeOverwriting = false;
//增加一个工作簿
Microsoft.Office.Interop.Excel.Workbook book = excel.Workbooks.Add(true);
System.Reflection.Missing miss = System.Reflection.Missing.Value;
//添加工作表
Microsoft.Office.Interop.Excel.Worksheet sheets = (Microsoft.Office.Interop.Excel.Worksheet)
book.Worksheets.Add(miss, miss, 19, Microsoft.Office.Interop.Excel.XlSheetType.xlWorksheet);
for (int i = 0; i < DS.Tables.Count; i++)
{
System.Data.DataTable table = DS.Tables[i];
//获取一个工作表
//Microsoft.Office.Interop.Excel.Worksheet sheet = book.Worksheets[i + 1] as Microsoft.Office.Interop.Excel.Worksheet;

Microsoft.Office.Interop.Excel.Worksheet sheet = book.Worksheets.Add(book.Worksheets[i + 1], Type.Missing, Type.Missing, Type.Missing) as Microsoft.Office.Interop.Excel.Worksheet;
int rowIndex = 1;
int colIndex = 0;
foreach (DataColumn col in table.Columns)
{
colIndex++;
sheet.Cells[1, colIndex] = col.ColumnName;
Microsoft.Office.Interop.Excel.Range Range1 = (Microsoft.Office.Interop.Excel.Range)sheet.Cells[1, colIndex];
Range1.Font.Bold = true;//表头字体加粗
Range1.Borders.Value = 1;
}
foreach (DataRow row in table.Rows)
{
rowIndex++;
colIndex = 0;
foreach (DataColumn col in table.Columns)
{
colIndex++;
sheet.Cells[rowIndex, colIndex] = row[col.ColumnName].ToString();
}
}
//sheet.Name = tableNames[i];
sheet.Name = GetLegalFileName(DS.Tables[i].TableName.ToString());
}
//删除多余Sheet
for (int g = 1; g <= book.Worksheets.Count; g++)
{
Microsoft.Office.Interop.Excel.Worksheet sheet = book.Worksheets[g] as Microsoft.Office.Interop.Excel.Worksheet;

if (sheet.Name.Length > 5 && sheet.Name.Substring(0, 5) == "Sheet")
{
sheet.Delete();
g--;
}
}
//book.Save();
book.SaveAs(strName, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
book.Close(false, miss, miss);
book = null;
}
catch (Exception)
{
throw;
}
finally
{
KillExcelProcess(excel);//结束Excel进程
GC.WaitForPendingFinalizers();
GC.Collect();
}
}
#endregion

2. OLEDB

这个需要3秒左右，要using System.Data.OleDb;

#region oledb方式
public static void ExcelExport(DataTable dt, string filepath, string tablename)
{
//excel 2003格式
string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties=Excel 8.0;";
//Excel 2007格式
//string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filepath + ";Extended Properties=Excel 12.0 Xml;";
try
{
using (OleDbConnection con = new OleDbConnection(connString))
{
con.Open();
StringBuilder strSQL = new StringBuilder();
strSQL.Append("CREATE TABLE ").Append("[" + tablename + "]");
strSQL.Append("(");
for (int i = 0; i < dt.Columns.Count; i++)
{
strSQL.Append("[" + dt.Columns[i].ColumnName + "] text,");
}
strSQL = strSQL.Remove(strSQL.Length - 1, 1);
strSQL.Append(")");

OleDbCommand cmd = new OleDbCommand(strSQL.ToString(), con);
cmd.ExecuteNonQuery();

for (int i = 0; i < dt.Rows.Count; i++)
{
strSQL.Clear();
StringBuilder strfield = new StringBuilder();
StringBuilder strvalue = new StringBuilder();
for (int j = 0; j < dt.Columns.Count; j++)
{
strfield.Append("[" + dt.Columns[j].ColumnName + "]");
strvalue.Append("'" + dt.Rows[i][j].ToString() + "'");
if (j != dt.Columns.Count - 1)
{
strfield.Append(",");
strvalue.Append(",");
}
else
{
}
}
cmd.CommandText = strSQL.Append(" insert into [" + tablename + "]( ")
.Append(strfield.ToString())
.Append(") values (").Append(strvalue).Append(")").ToString();
cmd.ExecuteNonQuery();
}
con.Close();
}
Console.WriteLine("OK");
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}

3.NPOI
这个在有二种方式，第一种在web页面下，很快，秒的速度，但是下下来的方式没有保存在某一目录下

aspx页只有一个按钮就可以了，.cs文件代码如下

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.HPSF;
using NPOI.POIFS.FileSystem;
using NPOI.SS.UserModel;

namespace ExportXlsToDownload
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

protected void Button1_Click(object sender, EventArgs e)
{
string filename="test.xls";
Response.ContentType = "application/vnd.ms-excel";
Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}",filename));
Response.Clear();

InitializeWorkbook();
GenerateData();
GetExcelStream().WriteTo(Response.OutputStream);
Response.End();
}

HSSFWorkbook hssfworkbook;

MemoryStream GetExcelStream()
{
//Write the stream data of workbook to the root directory
MemoryStream file = new MemoryStream();
hssfworkbook.Write(file);
return file;
}

void GenerateData()
{
ISheet sheet1 = hssfworkbook.CreateSheet("Sheet1");

sheet1.CreateRow(0).CreateCell(0).SetCellValue("This is a Sample");
int x = 1;
for (int i = 1; i <= 400; i++)
{
IRow row = sheet1.CreateRow(i);
for (int j = 0; j < 20; j++)
{
row.CreateCell(j).SetCellValue(x++);
}
}
}

void InitializeWorkbook()
{
hssfworkbook = new HSSFWorkbook();

////create a entry of DocumentSummaryInformation
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "NPOI Team";
hssfworkbook.DocumentSummaryInformation = dsi;

////create a entry of SummaryInformation
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Subject = "NPOI SDK Example";
hssfworkbook.SummaryInformation = si;
}
}
}

第二种方式,可以保存在目录下,也是秒存，代码如下

public class NPOIExcel
{
//最大数据条数
readonly int EXCEL03_MaxRow = 65535;

/// <summary>
/// 将DataTable转换为excel2003格式。
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public byte[] DataTable2Excel(DataTable dt, string sheetName)
{

IWorkbook book = new HSSFWorkbook();
if (dt.Rows.Count < EXCEL03_MaxRow)
DataWrite2Sheet(dt, 0, dt.Rows.Count - 1, book, sheetName);
else
{
int page = dt.Rows.Count / EXCEL03_MaxRow;
for (int i = 0; i < page; i++)
{
int start = i * EXCEL03_MaxRow;
int end = (i * EXCEL03_MaxRow) + EXCEL03_MaxRow - 1;
DataWrite2Sheet(dt, start, end, book, sheetName + i.ToString());
}
int lastPageItemCount = dt.Rows.Count % EXCEL03_MaxRow;
DataWrite2Sheet(dt, dt.Rows.Count - lastPageItemCount, lastPageItemCount, book, sheetName + page.ToString());
}
MemoryStream ms = new MemoryStream();
book.Write(ms);
return ms.ToArray();
}
private void DataWrite2Sheet(DataTable dt, int startRow, int endRow, IWorkbook book, string sheetName)
{
ISheet sheet = book.CreateSheet(sheetName);
IRow header = sheet.CreateRow(0);
for (int i = 0; i < dt.Columns.Count; i++)
{
ICell cell = header.CreateCell(i);
string val = dt.Columns[i].Caption ?? dt.Columns[i].ColumnName;
cell.SetCellValue(val);
}
int rowIndex = 1;
for (int i = startRow; i <= endRow; i++)
{
DataRow dtRow = dt.Rows[i];
IRow excelRow = sheet.CreateRow(rowIndex++);
for (int j = 0; j < dtRow.ItemArray.Length; j++)
{
excelRow.CreateCell(j).SetCellValue(dtRow[j].ToString());
}
}

}
}

第二种方式调用如下:

DataTable dt=GetData();
NPOIExcel myhelper = new NPOIExcel();
byte[] data = myhelper.DataTable2Excel(dt,"sheet");
string path = "d:\\temp" + DateTime.Now.Ticks.ToString() + ".xls";
if (!File.Exists(path))
{
FileStream fs = new FileStream(path, FileMode.CreateNew);
fs.Write(data, 0, data.Length);
fs.Close();

}