.Net用DataTable导出Excel通用函数(修正了Excel进程删除不掉问题)

1,首先要导入Com文件Microsoft Excel 11.0 Object Library.
2,要添加Interop.Excel.dll文件
https://files.cnblogs.com/ghostljj/Interop.Excel.rar
3.执行下面步骤
   /// <summary>
    /// 导出Excel
    /// </summary>
    /// <param name="dt">要导出的DataTable</param>
    public void ExportToExcel(System.Data.DataTable dt)
    {
        if (dt == null) return;
        Excel.Application xlApp = new Excel.Application();
        if (xlApp == null)
        {
            // lblMsg.Text = "无法创建Excel对象，可能您的机子未安装Excel";
            lblMsg.Text = GetLocalResourceObject("noexcel").ToString();
            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 = null;
        long totalCount = dt.Rows.Count;
        long rowRead = 0;
        float percent = 0;

        //写入标题
        for (int i = 0; i < dt.Columns.Count; i++)
        {
            worksheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;
            range = (Excel.Range)worksheet.Cells[1, i + 1];
            //range.Interior.ColorIndex = 15;//背景颜色
            range.Font.Bold = true;//粗体
            range.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;//居中
            //加边框
            range.BorderAround(Excel.XlLineStyle.xlContinuous, Excel.XlBorderWeight.xlThin, Excel.XlColorIndex.xlColorIndexAutomatic, null);
            //range.ColumnWidth = 4.63;//设置列宽
            //range.EntireColumn.AutoFit();//自动调整列宽
            //r1.EntireRow.AutoFit();//自动调整行高

        }
        //写入内容
        for (int r = 0; r < dt.Rows.Count; r++)
        {
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                worksheet.Cells[r + 2, i + 1] = dt.Rows[r][i];
                range = (Excel.Range)worksheet.Cells[r + 2, i + 1];
                range.Font.Size = 9;//字体大小
                //加边框
                range.BorderAround(Excel.XlLineStyle.xlContinuous, Excel.XlBorderWeight.xlThin, Excel.XlColorIndex.xlColorIndexAutomatic, null);
                range.EntireColumn.AutoFit();//自动调整列宽
            }
            rowRead++;
            percent = ((float)(100 * rowRead)) / totalCount;
            System.Windows.Forms.Application.DoEvents();
        }

        range.Borders[Excel.XlBordersIndex.xlInsideHorizontal].Weight = Excel.XlBorderWeight.xlThin;
        if (dt.Columns.Count > 1)
        {
            range.Borders[Excel.XlBordersIndex.xlInsideVertical].Weight = Excel.XlBorderWeight.xlThin;
        }

        try
        {
            workbook.Saved = true;
            workbook.SaveCopyAs(System.Web.HttpRuntime.AppDomainAppPath + "XMLFiles\\EduceWordFiles\\" + this.Context.User.Identity.Name + ".xls");
        }
        catch (Exception ex)
        {
            //lblMsg.Text = "导出文件时出错,文件可能正被打开！\n" + ex.Message;
            lblMsg.Text = GetLocalResourceObject("error").ToString() + "\n" + ex.Message;
        }

        workbooks.Close();
        if (xlApp != null)
        {
            xlApp.Workbooks.Close();

            xlApp.Quit();

            int generation = System.GC.GetGeneration(xlApp);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);

            xlApp = null;
            System.GC.Collect(generation);
        }
        GC.Collect();//强行销毁

        #region 强行杀死最近打开的Excel进程
        System.Diagnostics.Process[] excelProc = System.Diagnostics.Process.GetProcessesByName("EXCEL");
        System.DateTime startTime = new DateTime();
        int m, killId = 0;
        for (m = 0; m < excelProc.Length; m++)
        {
            if (startTime < excelProc[m].StartTime)
            {
                startTime = excelProc[m].StartTime;
                killId = m;
            }
        }
        if (excelProc[killId].HasExited == false)
        {
            excelProc[killId].Kill();
        }
        #endregion

        //提供下载
        BIClass.BusinessLogic.Util.ResponseFile(Page.Request, Page.Response, "ReportToExcel.xls"
            , System.Web.HttpRuntime.AppDomainAppPath + "XMLFiles\\EduceWordFiles\\" + this.Context.User.Identity.Name + ".xls", 1024000);
    }

//--------------------------------------------------------
4.如果是放在IIS中,现在是不能到出的,还要配置一下
方案一:在Web.config中添加
         <system.web>
               <identity impersonate="true" userName="管理员名" password="密码" />
         <system.web>
方案二:
         (1)在运行->dcomcnfg打开组件服务
         (2) 在 控制台根目录->组件服务->计算机->我的电脑->DCOM配置->Microsoft Excel应用程序->属性->安全
         (3)启动和激活权限->使用自定义->添加一个ASPNET用户,还有打开本地启动和本地激活
              访问权限->使用自定义->添加一个ASPNET用户,还有打开本地访问和远程访问