datagrid execl

前言

用传统的导出方法：只是将DataGrid信息用html输出，文件名后辍是.xls而已。
如果想将这个方法导入到Sql Server 中，会提示出错。因为它不是标准的Excel格式文件。

用本例中的导出方法：会输出标准的Excel格式文件，非常稳定，不会死锁Excel进程，支持中文文件名，支持表头导出，
支持大多数数据库导入。
实现算法：

   利用Excel组件将DataGrid控件内容生成Excel临时文件，并存放在服务器上，然后用Response方法将生成的Excel文件下载到客户

端然后再将生成的临时文件删除。

具体步骤：
1.在项目中引用Excel组件
Interop.Excel.dll 文件版本1.3.0.0
2.项目中应有一个目录（本例中Template目录），以便存放Excel文件（名字自己定）
3.导入方法类
 
protected void ExportToExcel(System.Web.UI.WebControls.DataGrid grid,string fileName)
        {
            string templetFilePath;
            templetFilePath = Server.MapPath("../").ToString() + @"Template/";
            object missing = Missing.Value;
            Excel.Application app;
            Excel.Workbook workBook;
            Excel.Worksheet workSheet;
            Excel.Range range;

            //创建一个Application对象并使其不可见
            app = new Excel.ApplicationClass();
            app.Visible=false;

           
            //打开模板文件，得到WorkBook对象
            //workBook = app.Workbooks.Open(templetFilePath + "SuperTemplet.xls", missing, missing, missing,

missing, missing,
            //    missing, missing, missing, missing, missing, missing, missing);

            //创建一个WorkBook对象
            workBook = app.Workbooks.Add(missing);
            //得到WorkSheet对象
            workSheet = (Excel.Worksheet)workBook.Sheets.get_Item(1);

            int rowCount = grid.Items.Count + 1;  //DataTable行数+GirdHead（因为DataGrid头还有一例所以得加1）
            int colCount = grid.Columns.Count;//DataTable列数

            //利用二维数组批量写入
            string[,] arr = new string[rowCount, colCount];

            for (int j = 0; j < rowCount; j++)
            {
                for (int k = 0; k < colCount; k++)
                {
                    if (j == 0)
                    {
                        arr[j, k] = grid.Columns[k].HeaderText;

                    }
                    else
                    {
                        arr[j, k] = grid.Items[j - 1].Cells[k].Text.ToString();
                    }
                }
            }

            range = (Excel.Range)workSheet.Cells[1, 1]; //写入Exel的坐标
            range = range.get_Resize(rowCount, colCount);
            range.Value = arr;
           
            workBook.SaveAs(templetFilePath + fileName, missing, missing, missing, missing,

missing,Excel.XlSaveAsAccessMode.xlExclusive, missing, missing, missing, missing);

            if (workBook.Saved)
            {
                workBook.Close(null, null, null);
                app.Workbooks.Close();
                app.Quit();
            }

            if (range != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(range);
                range = null;
            }

            if (workSheet != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workSheet);
                workSheet = null;
            }
            if (workBook != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workBook);
                workBook = null;
            }
            if (app != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
                app = null;
            }

            GC.Collect();//强制代码垃圾回收
           
            //下载文件
            DownLoadFile(templetFilePath,fileName);
        }
4.下载文件方法类
  /// <summary>
        /// 下载服务器文件
        /// </summary>
        /// <param name="_FilePath">文件路径</param>
        /// <param name="_FileName">文件名</param>
        /// <returns>返回 bool型</returns>
private  bool DownLoadFile(string _FilePath,string _FileName)
{
try
{
                System.IO.FileStream fs = System.IO.File.OpenRead(_FilePath+_FileName);
                byte[] FileData = new byte[fs.Length];
                fs.Read(FileData, 0, (int)fs.Length);
                Response.Clear();
                Response.AddHeader("Content-Type", "application/ms-excel");
                string FileName = System.Web.HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes(_FileName));
                Response.AddHeader("Content-Disposition", "inline;filename=" + System.Convert.ToChar(34) + FileName

+ System.Convert.ToChar(34));
                Response.AddHeader("Content-Length", fs.Length.ToString());
                Response.BinaryWrite(FileData);
                fs.Close();
                //删除服务器临时文件
                System.IO.File.Delete(_FilePath+_FileName);
                Response.Flush();
                Response.End();

return true;
}
catch(Exception ex)
{
                ex.Message.ToString();
return false;
}
}
5.应用方法
 protected void btnExportToExcel_Click(object sender, EventArgs e)
        {
           
            this.ExportToExcel(grdBudget,"油管厂发料记录.xls");//grdBudget 是DataGrid的ID
      
        }
此文出处：www.wsoft.net
原文地址：http://www.wsoft.net/Index/Catalog53/225.aspx