将DataTable导出为Excel

    /// <summary>
    /// 将DataTable中的数据导出到Excel文件中
    /// </summary>
    /// <param name="page">Web页面对象</param>
    /// <param name="tab">包含被导出数据的DataTable对象</param>
    /// <param name="FileName">Excel文件的名称</param>
    public static void Export(System.Web.UI.Page page, System.Data.DataTable tab)
    {
        System.Web.HttpResponse httpResponse = page.Response;
        System.Web.UI.WebControls.DataGrid dataGrid = new System.Web.UI.WebControls.DataGrid();
        dataGrid.DataSource = tab.DefaultView;
        dataGrid.AllowPaging = false;
        dataGrid.HeaderStyle.BackColor = System.Drawing.ColorTranslator.FromHtml("#B5C7EF");
        dataGrid.AlternatingItemStyle.BackColor = System.Drawing.ColorTranslator.FromHtml("#E0E0E0");
        dataGrid.HeaderStyle.ForeColor = System.Drawing.ColorTranslator.FromHtml("#003399");
        dataGrid.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
        dataGrid.HeaderStyle.Font.Bold = true;
        dataGrid.DataBind();
        
        httpResponse.ClearContent();
        httpResponse.AddHeader("content-disposition", "attachment; filename=MyExcelFile.xls");
        httpResponse.ContentType = "application/excel";

        System.IO.StringWriter sw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);

        dataGrid.RenderControl(htw);
        page.Response.Write(sw.ToString());
        page.Response.End();
    }