不预览直接打印 Microsoft RDLC报表

我用.net写程序,做报表时一直用水晶报表来做,最近发现用Microsoft的RDLC做报表也不错,而且方便,最主要布署(WEB)的时修没有水晶报表那么麻烦。 但是唯一的缺点是学习资料太少了，都得自己瞎搞。唯一好的资源就只有蜡人张同志的《RDLC报表》系列，当然还有MSDN 。 下面是不预览直接打印的实现，主要代码来自MSDN。

private void btnPrint_Click(object sender, EventArgs e)

{

Run();

}

private int m_currentPageIndex;

private IList<Stream> m_streams;

private DataTable LoadSalesData()

{

SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["testrdlc.Properties.Settings.NorthwindConnectionString"].ConnectionString);

SqlCommand cmd = new SqlCommand("SELECT * FROM Employees", con);

SqlDataAdapter adp = new SqlDataAdapter();

adp.SelectCommand = cmd;

con.Open();

DataTable dt = new DataTable();

adp.Fill(dt);

con.Close();

return dt;

}

private Stream CreateStream(string name, string fileNameExtension,

Encoding encoding, string mimeType, bool willSeek)

{

Stream stream = new FileStream(name + "." + fileNameExtension,

FileMode.Create);

m_streams.Add(stream);

return stream;

}

private void Export(LocalReport report)

{

string deviceInfo =

"<DeviceInfo>" +

"  <OutputFormat>EMF</OutputFormat>" +

//"  <PageWidth>8.5in</PageWidth>" +

//"  <PageHeight>11in</PageHeight>" +

//"  <MarginTop>0.25in</MarginTop>" +

//"  <MarginLeft>0.25in</MarginLeft>" +

//"  <MarginRight>0.25in</MarginRight>" +

//"  <MarginBottom>0.25in</MarginBottom>" +

"</DeviceInfo>";

Warning[] warnings;

m_streams = new List<Stream>();

try

{

report.Render("Image", deviceInfo, CreateStream, out warnings);

}

catch (Exception ex)

{

Exception innerEx = ex.InnerException;//取内异常。因为内异常的信息才有用，才能排除问题。

while (innerEx != null)

{

MessageBox.Show(innerEx.Message);

innerEx = innerEx.InnerException;

}

}

foreach (Stream stream in m_streams)

stream.Position = 0;

}

private void PrintPage(object sender, PrintPageEventArgs ev)

{

Metafile pageImage = new Metafile(m_streams[m_currentPageIndex]);

ev.Graphics.DrawImage(pageImage, 0, 0);

m_currentPageIndex++;

ev.HasMorePages = (m_currentPageIndex < m_streams.Count);

}

private void Print()

{

const string printerName = "Microsoft Office Document Image Writer";

if (m_streams == null || m_streams.Count == 0)

return;

PrintDocument printDoc = new PrintDocument();

printDoc.PrinterSettings.PrinterName = printerName;

if (!printDoc.PrinterSettings.IsValid)

{

string msg = String.Format("Can't find printer /"{0}/".", printerName);

Debug.WriteLine(msg);

return;

}

printDoc.PrintPage += new PrintPageEventHandler(PrintPage);

printDoc.Print();

}

private void Run()

{

LocalReport report = new LocalReport();

report.ReportPath = Application.StartupPath +"//Report1.rdlc";//加上报表的路径

report.DataSources.Add(new ReportDataSource("NorthwindDataSet_Employees", LoadSalesData()));

Export(report);

m_currentPageIndex = 0;

Print();

}

要说明的是：
一、report.ReportPath 属性指定的位置一定要有报表文件。
二、如果report.Render出现异常，必须捕获内异常信息，因为最外层异常信息的用处不大，根本无法排除问题。
三、

LocalReport.Render 方法的第一个参数format
呈现报表所用的格式。 此参数将映射到某个呈现扩展插件。 支持的格式包括 Microsoft Office Excel、PDF 和 Image。详情参见MSDN

例子原码：下载