.net 操作excel

    public void OutputExcel(DataView dv, string str)
    {

        //dv为要输出到Excel的数据，str为标题名称
        GC.Collect();
        Application excel;
        int rowIndex = 4;
        int colIndex = 1;

        _Workbook xBk;
        _Worksheet xSt;

        excel = new ApplicationClass();

        xBk = excel.Workbooks.Add(true);

        xSt = (_Worksheet)xBk.ActiveSheet;

        //
        //取得标题
        //
        foreach (DataColumn col in dv.Table.Columns)
        {
            colIndex++;
            excel.Cells[4, colIndex] = col.ColumnName;
            xSt.get_Range(excel.Cells[4, colIndex], excel.Cells[4, colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter;//设置标题格式为居中对齐
        }

        //
        //取得表格中的数据
        //
        foreach (DataRowView row in dv)
        {
            rowIndex++;
            colIndex = 1;
            foreach (DataColumn col in dv.Table.Columns)
            {
                colIndex++;
                if (col.DataType == System.Type.GetType("System.DateTime"))
                {
                    excel.Cells[rowIndex, colIndex] = (Convert.ToDateTime(row[col.ColumnName].ToString())).ToString("yyyy-MM-dd");
                    xSt.get_Range(excel.Cells[rowIndex, colIndex], excel.Cells[rowIndex, colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter;//设置日期型的字段格式为居中对齐
                }
                else
                    if (col.DataType == System.Type.GetType("System.String"))
                    {
                        excel.Cells[rowIndex, colIndex] = "'" + row[col.ColumnName].ToString();
                        xSt.get_Range(excel.Cells[rowIndex, colIndex], excel.Cells[rowIndex, colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter;//设置字符型的字段格式为居中对齐
                    }
                    else
                    {
                        excel.Cells[rowIndex, colIndex] = row[col.ColumnName].ToString();
                    }
            }
        }
        //
        //加载一个合计行
        //
        int rowSum = rowIndex + 1;
        int colSum = 2;
        excel.Cells[rowSum, 2] = "合计";
        xSt.get_Range(excel.Cells[rowSum, 2], excel.Cells[rowSum, 2]).HorizontalAlignment = XlHAlign.xlHAlignCenter;
        //
        //设置选中的部分的颜色
        //
        xSt.get_Range(excel.Cells[rowSum, colSum], excel.Cells[rowSum, colIndex]).Select();
        xSt.get_Range(excel.Cells[rowSum, colSum], excel.Cells[rowSum, colIndex]).Interior.ColorIndex = 19;//设置为浅黄色，共计有56种
        //
        //取得整个报表的标题
        //
        excel.Cells[2, 2] = str;
        //
        //设置整个报表的标题格式
        //
        xSt.get_Range(excel.Cells[2, 2], excel.Cells[2, 2]).Font.Bold = true;
        xSt.get_Range(excel.Cells[2, 2], excel.Cells[2, 2]).Font.Size = 22;
        //
        //设置报表表格为最适应宽度
        //
        xSt.get_Range(excel.Cells[4, 2], excel.Cells[rowSum, colIndex]).Select();
        xSt.get_Range(excel.Cells[4, 2], excel.Cells[rowSum, colIndex]).Columns.AutoFit();
        //
        //设置整个报表的标题为跨列居中
        //
        xSt.get_Range(excel.Cells[2, 2], excel.Cells[2, colIndex]).Select();
        xSt.get_Range(excel.Cells[2, 2], excel.Cells[2, colIndex]).HorizontalAlignment = XlHAlign.xlHAlignCenterAcrossSelection;
        //
        //绘制边框
        //
        xSt.get_Range(excel.Cells[4, 2], excel.Cells[rowSum, colIndex]).Borders.LineStyle = 1;
        xSt.get_Range(excel.Cells[4, 2], excel.Cells[rowSum, 2]).Borders[XlBordersIndex.xlEdgeLeft].Weight = XlBorderWeight.xlThick;//设置左边线加粗
        xSt.get_Range(excel.Cells[4, 2], excel.Cells[4, colIndex]).Borders[XlBordersIndex.xlEdgeTop].Weight = XlBorderWeight.xlThick;//设置上边线加粗
        xSt.get_Range(excel.Cells[4, colIndex], excel.Cells[rowSum, colIndex]).Borders[XlBordersIndex.xlEdgeRight].Weight = XlBorderWeight.xlThick;//设置右边线加粗
        xSt.get_Range(excel.Cells[rowSum, 2], excel.Cells[rowSum, colIndex]).Borders[XlBordersIndex.xlEdgeBottom].Weight = XlBorderWeight.xlThick;//设置下边线加粗
        //
        //显示效果
        //
        excel.Visible = true;

        //xSt.Export(Server.MapPath(".")+"//"+this.xlfile.Text+".xls",SheetExportActionEnum.ssExportActionNone,Microsoft.Office.Interop.OWC.SheetExportFormat.ssExportHTML);
        xBk.SaveCopyAs(Server.MapPath(".") + "//" + this.xlfile.Text + ".xls");

        ds = null;
        xBk.Close(false, null, null);

        excel.Quit();
        System.Runtime.InteropServices.Marshal.ReleaseComObject(xBk);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(xSt);
        xBk = null;
        excel = null;
        xSt = null;
        GC.Collect();
        string path = Server.MapPath(this.xlfile.Text + ".xls");

        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);
        // 停止页面的执行

        Response.End();
    }