支持打印预览多个DevExpress控件方法

        /// <summary>
        /// 打印预览多个控件
        /// </summary>
        /// <param name="panels"></param>
        /// <param name="title"></param>
        /// <param name="pageSize"></param>
        protected virtual void Prints(IPrintable[] panels, string title = null, PaperKind pageSize = PaperKind.A4)
        {
            PrintingSystem ps = new DevExpress.XtraPrinting.PrintingSystem();
            CompositeLink link = new CompositeLink(ps);
           
            foreach (IPrintable panel in panels)
            {
                link.Links.Add(CreatePrintableLink(panel));
            }
            link.Landscape = true;//横向
            link.PaperKind = pageSize;//设置纸张大小
            link.Margins = new System.Drawing.Printing.Margins(10, 10, 50, 50);

            PageHeaderFooter phf = link.PageHeaderFooter as PageHeaderFooter;
            //判断是否有标题，有则设置
            if (!string.IsNullOrEmpty(title))
            {

                phf.Header.Content.Clear();
                phf.Header.Content.AddRange(new string[] { "", title, "" });
                phf.Header.Font = new System.Drawing.Font("宋体", 14, System.Drawing.FontStyle.Bold);
                phf.Header.LineAlignment = BrickAlignment.Center;
            }
            phf.Footer.Content.Clear();