代码实现报表打印

   代码实现报表打印

   

     //初始化报表信息
        private void SetReportInfo(string reportPath,string sourceName,DataTable dataSource,bool isFengPi)
        {
            if (!File.Exists(reportPath))
            {
                MessageBox.Show("报表文件:" + reportPath + " 不存在!","提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            if (dataSource == null || dataSource.Rows.Count == 0)
            {
                MessageBox.Show("没有找到案卷号为:"+txtArchiveNum.Text.Trim()+"的相关目录信息", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            pos = 1;
            LocalReport report1 = new LocalReport();
            //设置需要打印的报表的文件名称。 
            report1.ReportPath = reportPath;
            if (isFengPi)
            {
                //设置参数
                string archveTypeName = GetArchiveTypeName();
                ReportParameter archiveType = new ReportParameter("ArchiveType", archveTypeName);
                report1.SetParameters(archiveType);
            }
            //创建要打印的数据源
            ReportDataSource source = new ReportDataSource(sourceName, dataSource);
            report1.DataSources.Add(source);
            //刷新报表中的需要呈现的数据  
            report1.Refresh();
            pos = 2;
            m_streams = new List<Stream>();
             string deviceInfo ="<DeviceInfo>" + 
                 "  <OutputFormat>EMF</OutputFormat>" +
                 "  <PageWidth>21cm</PageWidth>" +
                 "  <PageHeight>29.7cm</PageHeight>" +
                 "  <MarginTop>2.0066cm</MarginTop>" +
                 "  <MarginLeft>2.0066cm</MarginLeft>" +
                 "  <MarginRight>2.0066cm</MarginRight>" +
                 "  <MarginBottom>2.0066cm</MarginBottom>" +
                 "</DeviceInfo>"; 
            Warning[] warnings; 
            //将报表的内容按照deviceInfo指定的格式输出到CreateStream函数提供的Stream中。
            report1.Render("Image", deviceInfo, CreateStream, out warnings);
        }

        //声明一个Stream对象的列表用来保存报表的输出数据 
        //LocalReport对象的Render方法会将报表按页输出为多个Stream对象。
        private List<Stream> m_streams; 
        //用来提供Stream对象的函数，用于LocalReport对象的Render方法的第三个参数。
        private Stream CreateStream(string name, string fileNameExtension, Encoding encoding, string mimeType, bool willSeek)
           
        {
            pos = 3;
            //如果需要将报表输出的数据保存为文件，请使用FileStream对象。
            Stream stream = new MemoryStream();
            m_streams.Add(stream);
            return stream;
        }

        //用来记录当前打印到第几页了 
        private int m_currentPageIndex;

        #region 打印报表
        private void Print() 
        {
            pos = 4;
            m_currentPageIndex = 0;  
            if (m_streams == null || m_streams.Count == 0)
                return; 
            //声明PrintDocument对象用于数据的打印 
            PrintDocument printDoc = new PrintDocument(); 
            //指定需要使用的打印机的名称，使用空字符串""来指定默认打印机  
           // printDoc.PrinterSettings.PrinterName = ""; 
            //判断指定的打印机是否可用 
            if (!printDoc.PrinterSettings.IsValid)
            { 
                MessageBox.Show("没有找到打印机!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information); 
                return; 
            }
            pos = 5;
            printDoc.PrintPage += new PrintPageEventHandler(PrintPage);
            //执行打印操作，Print方法将触发PrintPage事件。
            printDoc.Print();

            //释放资源
            foreach (Stream stream in m_streams)
            {               
                stream.Dispose();
                stream.Close();
            }
            m_streams = null;
        }

        private void PrintPage(object sender, PrintPageEventArgs ev)
        {
            pos =6;
            //Metafile对象用来保存EMF或WMF格式的图形，
            //我们在前面将报表的内容输出为EMF图形格式的数据流。
            m_streams[m_currentPageIndex].Position = 0;
            Metafile pageImage = new Metafile(m_streams[m_currentPageIndex]);
            //指定是否横向打印
            ev.PageSettings.Landscape = false;
            //这里的Graphics对象实际指向了打印机
            ev.Graphics.DrawImage(pageImage, ev.PageBounds);
            m_streams[m_currentPageIndex].Close();
            m_currentPageIndex++;
            //设置是否需要继续打印
            ev.HasMorePages = (m_currentPageIndex < m_streams.Count);
        }
        #endregion 

       //打印封皮
        private void btPrint_Click(object sender, EventArgs e)
        {
            string reportPath = Application.StartupPath + "\\Files\\ReportEnvelop.rdlc";
            SetReportInfo(reportPath, "DataSet1", GetDataSource(true), true);
            Print();

        }