ActiveReports 产品除了本身非常容易使用之外,他还提供了用户自定义的能力,比如我们今天要实现的在ASP.NET系统中“为区域报表导出为PDF添加进度显示功能”,我们将在报表导出过程中显示一个导出进度提示,下面是实际运行的截图:
要实现该功能,我们可以借助jQuery中的Ajax技术。我们将在按钮的单击事件中将报表导出为PDF文件,同时我们会将隐藏的进度提示图片变为可见状态,下面是按钮单击事件的处理代码:
<script language="javascript" type="text/javascript"> function btnExport_onclick() { document.getElementById("Image1").style.visibility = "visible"; document.getElementById("btnExport").style.visibility = "hidden"; $.ajax({ url: 'WebForm1.aspx?command=pdfexport', success: function (data) { window.location = "WebForm1.aspx?command=showpdf"; } }); } </script>
在后台代码中我们将导出的 PDF 文档以文件流的显示存放到Session中,Window.Location通过一个带参数的URL地址来显示一个页面,下面是服务端的代码实现:
protected void Page_Load(object sender, EventArgs e) { if (Request["command"] != null) { if (Request["command"].ToString() == "pdfexport") { Session.Add("pdfdata", null); System.IO.MemoryStream m_stream = new System.IO.MemoryStream(); NewActiveReport1 rpt = new NewActiveReport1(); rpt.Run(); GrapeCity.ActiveReports.Export.Pdf.Section.PdfExport pdfExport1 = new GrapeCity.ActiveReports.Export.Pdf.Section.PdfExport(); if (pdfExport1 == null) { pdfExport1 = new GrapeCity.ActiveReports.Export.Pdf.Section.PdfExport(); } pdfExport1.Export(rpt.Document, m_stream); m_stream.Position = 0; Session["pdfdata"] = m_stream; } if (Request["command"].ToString() == "showpdf") { if (Session["pdfdata"] != null) { System.IO.MemoryStream m_stream = new System.IO.MemoryStream(); m_stream = (System.IO.MemoryStream)Session["pdfdata"]; Response.ContentType = "application/pdf"; Response.AddHeader("content-disposition", "inline;filename=MyExport.pdf"); Response.BinaryWrite(m_stream.ToArray()); Response.End(); } } } }
源码下载:VS2010 + ActiveReports 7