将数据库里的数据导出到EXCEL中的方法

/// <summary>
/// 导出非防汛责任人的数据到Excel
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnExcelOut_Click(object sender, EventArgs e)
{
string strSQL = string.Empty;
DataSet dataSet = new DataSet();
strSQL = string.Format("SELECT [Name] as 姓名,Telephone as 手机,UnitName as 单位,Remark as 备注 FROM A03_NO_FXZRR_SMS_REP WHERE GroupName LIKE '%{0}%'", managename.Trim());
dataSet = db.RunProcReturn(strSQL, managename);
string toFileName = "~/Manage/非防汛责任人.xls";
doExport(dataSet.Tables[0],toFileName,"Sheet1");
DownFiles(toFileName);

}

///  <summary>
///  执行导出
///  </summary>
///  <param   name="ds">要导出的DataTable </param>
///  <param   name="toFileName">要导出到的execl文件路径+文件名</param>
///   <param   name="strExcelFileName">导出到的execl的Sheet名</param>
private void doExport(DataTable dt, string toFileName, string strSheetName)
{
string fromFileName = "NullExcel.xls";
toFileName = Server.MapPath(toFileName);
Excel.Application excel = new Excel.Application();  //Execl的操作类
//读取保存目标的对象
Excel.Workbook bookDest = excel.Workbooks._Open(Server.MapPath(fromFileName), Missing.Value, Missing.Value, Missing.Value, Missing.Value
, Missing.Value, Missing.Value, Missing.Value, Missing.Value
, Missing.Value, Missing.Value, Missing.Value, Missing.Value);//打开要导出到的Execl文件的工作薄。
Excel.Worksheet sheetDest = bookDest.Worksheets.get_Item(1) as Excel.Worksheet;

//sheetDest.Name = strSheetName;
int rowIndex = 1;
int colIndex = 0;

excel.Application.Workbooks.Add(true);//这句不写不知道会不会报错

foreach (DataColumn col in dt.Columns)
{
colIndex++;
sheetDest.Cells[1, colIndex] = col.ColumnName;//Execl中的第一列,把DataTable的列名先导进去
}

//导入数据行
foreach (DataRow row in dt.Rows)
{
rowIndex++;
colIndex = 0;
foreach (DataColumn col in dt.Columns)
{
colIndex++;
sheetDest.Cells[rowIndex, colIndex] = row[col.ColumnName].ToString();
}
}

bookDest.SaveAs(toFileName, Missing.Value, Missing.Value, Missing.Value, Missing.Value
, Missing.Value,Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlShared, Missing.Value, Missing.Value
, Missing.Value, Missing.Value, Missing.Value);
excel = null;
bookDest = null;

GC.Collect();//垃圾回收
}

/// <summary>
///  下载文件,新建一个down.aspx页面
/// </summary>
/// <param name="fileUrl">下载文件的路径或文件名</param>
public void DownFiles(string fileUrl)
{
string path = Server.MapPath(fileUrl);
System.IO.FileInfo file = new System.IO.FileInfo(path);
Response.Clear();
Response.Charset = "GB2312";
Response.ContentEncoding = System.Text.Encoding.UTF8;
//   添加头信息，为"文件下载/另存为"对话框指定默认文件名
Response.AddHeader("Content-Disposition", "attachment;   filename=" + Server.UrlEncode(file.Name));
//   添加头信息，指定文件大小，让浏览器能够显示下载进度
Response.AddHeader("Content-Length", file.Length.ToString());
//   指定返回的是一个不能被客户端读取的流，必须被下载
Response.ContentType = "application/ms-excel";
//   把文件流发送到客户端
Response.WriteFile(file.FullName);
FileStream fs = File.OpenRead(path);
byte[] bytes = new Byte[file.Length];
Response.BinaryWrite(bytes);
Response.End();
}