asp.net c# 导出Excel WEB

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asp.net c# 导出Excel

 

 ///

    /// al:要打印的记录集    columnname:表头显示名称
    ///

    public static void outtoExcel(ArrayList al,string[] columnname) {


        Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
        Microsoft.Office.Interop.Excel.Workbook workbook = excel.Application.Workbooks.Add(true);
        Microsoft.Office.Interop.Excel._Worksheet wsheet = (Microsoft.Office.Interop.Excel._Worksheet)workbook.Worksheets.Add(Type.Missing, Type.Missing, 1, Type.Missing);
        wsheet.Name = "报表";
        int i = 1;
        foreach (String[] str in al)
        {

            if (i == 1)//表头
            {
                //object[] columnname = daobean.getTableColumnName(tableFlag);

                int k = 0;
                //foreach (DictionaryContent str2 in columnname)
                //{
                foreach (string strname in columnname)
                {
                    excel.Cells[1, k + 1] = strname;//表头初始化
                    k++;
                }
                //}

            }
            i++;
            for (int j = 0; j < str.Length; j++)
            {//进入内部循环，以增加表格列
                excel.Cells[i, j+1] = str[j];
            }

        }
        excel.Visible = true;
        //Response.Write("");

        //======
        string fileName = Global.getRamFileName();
        workbook.SaveCopyAs(System.Web.HttpContext.Current.Server.MapPath(".") + "//excel//" + fileName + ".xls");
        workbook.Close(false, null, null);
        excel.Quit();

        System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(wsheet);
        workbook = null;
        excel = null;
        wsheet = null;

        string path = System.Web.HttpContext.Current.Server.MapPath("excel//" + fileName + ".xls");

        System.IO.FileInfo file = new System.IO.FileInfo(path);
        System.Web.HttpContext.Current.Response.Clear();
        System.Web.HttpContext.Current.Response.Charset = "UTF-8";
        System.Web.HttpContext.Current.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
        System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpContext.Current.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
        System.Web.HttpContext.Current.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
        System.Web.HttpContext.Current.Response.ContentType = "application/ms-excel";

        // 把文件流发送到客户端
        System.Web.HttpContext.Current.Response.WriteFile(file.FullName);
        // 停止页面的执行

        System.Web.HttpContext.Current.Response.End();
        //CheckBoxList1.Items.Clear();
   
   
    }