/// <summary>        /// 打印功能        /// </summary>        /// <param name="panel">打印控件</param>        /// <param name="title">标题</param>        /// <param name="pageSize">纸张类型</param>        /// <param name="margins">边距</param>        protected virtual void Print(IPrintable panel, string title = null, PaperKind pageSize = PaperKind.A4, System.Drawing.Printing.Margins margins = null)        {            PrintingSystem ps = new PrintingSystem();            CompositeLink link = new CompositeLink(ps);                       PrintableComponentLink printableLink = new PrintableComponentLink() { Component = panel };            ps.Links.Add(link);            link.Links.Add(printableLink);            link.Landscape = true;//横向            link.PaperKind = pageSize;//设置纸张大小            if (margins == null)                margins = new System.Drawing.Printing.Margins(10, 10, 50, 50);            link.Margins = margins;            //判断是否有标题，有则设置            if (!string.IsNullOrEmpty(title))            {                PageHeaderFooter phf = link.PageHeaderFooter as PageHeaderFooter;                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.AddRange(new string[] { "", String.Format("打印时间: {0:g}", DateTime.Now), "" });            }            link.CreateDocument(); //建立文档            ps.PreviewRibbonFormEx.Show();//进行预览         }