winForm中导出Execl的方法（转）

原链接：http://www.cnblogs.com/apex-yang/articles/1391464.html

winForm中导出Execl的方法：

1、方法1：

   SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);
   SqlDataAdapter da=new SqlDataAdapter("select * from tb1",conn);
   DataSet ds=new DataSet();
   da.Fill(ds,"table1");
   DataTable dt=ds.Tables["table1"];
   string name=System.Configuration.ConfigurationSettings.AppSettings["downloadurl"].ToString()+DateTime.Today.ToString("yyyyMMdd")+new Random(DateTime.Now.Millisecond).Next(10000).ToString()+".csv";//存放到web.config中downloadurl指定的路径，文件格式为当前日期+4位随机数
   FileStream fs=new FileStream(name,FileMode.Create,FileAccess.Write);
   StreamWriter sw=new StreamWriter(fs,System.Text.Encoding.GetEncoding("gb2312"));
   sw.WriteLine("自动编号,姓名,年龄");
   foreach(DataRow dr in dt.Rows)
   {
    sw.WriteLine(dr["ID"]+","+dr["vName"]+","+dr["iAge"]);
   }
   sw.Close();
   Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(name));
   Response.ContentType = "application/ms-excel";// 指定返回的是一个不能被客户端读取的流，必须被下载
   Response.WriteFile(name); // 把文件流发送到客户端
   Response.End();

 

public void Out2Excel(string sTableName,string url)
{
Excel.Application oExcel=new Excel.Application();
Workbooks oBooks;
Workbook oBook;
Sheets oSheets;
Worksheet oSheet;
Range oCells;
string sFile="",sTemplate="";
//
System.Data.DataTable dt=TableOut(sTableName).Tables[0];

sFile=url+"myExcel.xls";
sTemplate=url+"MyTemplate.xls";
//
oExcel.Visible=false;
oExcel.DisplayAlerts=false;
//定义一个新的工作簿
oBooks=oExcel.Workbooks;
oBooks.Open(sTemplate,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing, Type.Missing, Type.Missing);
oBook=oBooks.get_Item(1);
oSheets=oBook.Worksheets;
oSheet=(Worksheet)oSheets.get_Item(1);
//命名该sheet
oSheet.Name="Sheet1";

oCells=oSheet.Cells;
//调用dumpdata过程，将数据导入到Excel中去
DumpData(dt,oCells);
//保存
oSheet.SaveAs(sFile,Excel.XlFileFormat.xlTemplate,Type.Missing,Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing);
oBook.Close(false, Type.Missing,Type.Missing);
//退出Excel，并且释放调用的COM资源
oExcel.Quit();

GC.Collect();
KillProcess("Excel");
}

private void KillProcess(string processName)
{
System.Diagnostics.Process myproc= new System.Diagnostics.Process();
//得到所有打开的进程
try
{
foreach (Process thisproc in Process.GetProcessesByName(processName))
{
if(!thisproc.CloseMainWindow())
{
thisproc.Kill();
}
}
}
catch(Exception Exc)
{
throw new Exception("",Exc);
}
}

2、方法2：


 

protected void ExportExcel()
  {
   gridbind();
   if(ds1==null) return;
 
   string saveFileName="";
//   bool fileSaved=false;
   SaveFileDialog saveDialog=new SaveFileDialog();
   saveDialog.DefaultExt ="xls";
   saveDialog.Filter="Excel文件|*.xls";
   saveDialog.FileName ="Sheet1";
   saveDialog.ShowDialog();
   saveFileName=saveDialog.FileName;
   if(saveFileName.IndexOf(":")<0) return; //被点了取消
//   excelapp.Workbooks.Open   (App.path & 工程进度表.xls)
  
   Excel.Application xlApp=new Excel.Application();
   object missing=System.Reflection.Missing.Value;
 

   if(xlApp==null)
   {
    MessageBox.Show("无法创建Excel对象，可能您的机子未安装Excel");
    return;
   }
   Excel.Workbooks workbooks=xlApp.Workbooks;
   Excel.Workbook workbook=workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
   Excel.Worksheet worksheet=(Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
   Excel.Range range;
   
 
   string oldCaption=Title_label .Text.Trim ();
   long totalCount=ds1.Tables[0].Rows.Count;
   long rowRead=0;
   float percent=0;
 
   worksheet.Cells[1,1]=Title_label .Text.Trim ();
   //写入字段
   for(int i=0;i    {
    worksheet.Cells[2,i+1]=ds1.Tables[0].Columns.ColumnName; 
    range=(Excel.Range)worksheet.Cells[2,i+1];
    range.Interior.ColorIndex = 15;
    range.Font.Bold = true;
 
   }
   //写入数值
   Caption .Visible = true;
   for(int r=0;r    {
    for(int i=0;i     {
     worksheet.Cells[r+3,i+1]=ds1.Tables[0].Rows[r];    
    }
    rowRead++;
    percent=((float)(100*rowRead))/totalCount;   
    this.Caption.Text= "正在导出数据["+ percent.ToString("0.00")  +"%]...";
    Application.DoEvents();
   }
   worksheet.SaveAs(saveFileName,missing,missing,missing,missing,missing,missing,missing,missing);
   
   this.Caption.Visible= false;
   this.Caption.Text= oldCaption;
 
   range=worksheet.get_Range(worksheet.Cells[2,1],worksheet.Cells[ds1.Tables[0].Rows.Count+2,ds1.Tables[0].Columns.Count]);
   range.BorderAround(Excel.XlLineStyle.xlContinuous,Excel.XlBorderWeight.xlThin,Excel.XlColorIndex.xlColorIndexAutomatic,null);
  
   range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].ColorIndex = Excel.XlColorIndex.xlColorIndexAutomatic;
   range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].LineStyle =Excel.XlLineStyle.xlContinuous;
   range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].Weight =Excel.XlBorderWeight.xlThin;
 
   if(ds1.Tables[0].Columns.Count>1)
   {
    range.Borders[Excel.XlBordersIndex.xlInsideVertical].ColorIndex=Excel.XlColorIndex.xlColorIndexAutomatic;
    }
   workbook.Close(missing,missing,missing);
   xlApp.Quit();
  }

三、附注：
虽然都是实现导出execl的功能，但在asp.net和winform的程序中，实现的代码是各不相同的。在asp.net中，是在服务器端读取数据，在服务器端把数据以ms-execl的格式，以Response输出到浏览器（客户端)；而在winform中，是把数据读到客户端（因为winform运行端就是客户端），然后调用客户端安装的office组件，将读到的数据写在execl的工作簿中。 

大数据量的并发导出请求会造成服务器端内存的严重消耗和性能下降

我认为比较理想的方案是再客户端利用activex或applet分页请求数据并导出到Excel……