using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.IO;

using Microsoft.Reporting.WebForms;

/// 
    /// PrintHelper 的摘要描述    /// 
    public class PrintHelper    {        private int m_currentPageIndex;        private IList
     
       m_streams;        private bool isLandSapces=false;      /// 
      
      ///       /// 
      /// 
      rdlc路径      /// 
      打印机名称      /// 
      数据表集数据      /// 
      数据对应rdlc中的数据集名称      /// 
      报表参数集合      /// 
      是否隐藏      /// 
      输出信息        /// 
      报表长度（单位：mm）        public void Run(string reportPath, string printerName, DataTable dt1, string dt1SourceName, List
      
        paramesList, bool isHindeLogo, out string msg, int reportWidth = 430)        {            LocalReport report = new LocalReport();                        report.ReportPath = reportPath;//加上报表的路径            report.DataSources.Add(new ReportDataSource(dt1SourceName, dt1));              report.EnableExternalImages = true;            report.SetParameters(paramesList);            //ReportParameter rp = new ReportParameter("isHindeLogoImg", isHindeLogo.ToString());//这里我在报表里弄的参数            //report.SetParameters(rp);            isLandSapces = report.GetDefaultPageSettings().IsLandscape;            Export(report, reportWidth);            m_currentPageIndex = 0;            Print(printerName, out  msg);        }        /// 
       
        ///         /// 
        /// 
               /// 
       报表长度（单位：mm）        private void Export(LocalReport report,int reportWidth=430)        {            string deviceInfo =              "
       
        " +              "  
        
         EMF
        " +              "  
        
         " + reportWidth + "mm
        " +              "  
        
         297mm
        " +              "  
        
         5mm
        " +              "  
        
         10mm
        " +              "  
        
         10mm
        " +              "  
        
         5mm
        " +              "
       ";//这里是设置打印的格式 边距什么的            Warning[] warnings;            m_streams = new List
       
        ();            try            {                report.Render("Image", deviceInfo, CreateStream, out warnings);//一般情况这里会出错的  使用catch得到错误原因  一般都是简单错误                            }            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);                    string errmessage = innerEx.Message;                    innerEx = innerEx.InnerException;                }            }            foreach (Stream stream in m_streams)            {                stream.Position = 0;            }        }        string ssss = "--";        private Stream CreateStream(string name, string fileNameExtension, Encoding encoding, string mimeType, bool willSeek)        {            //name 需要进一步处理            Stream stream = null;            try            {                stream = new FileStream("c:\\users\\administrator\\documents\\visual studio 2010\\Projects\\WebApplication1\\WebApplication1\\Report\\" + name + DateTime.Now.Millisecond + "." + fileNameExtension, FileMode.Create);//为文件名加上时间                m_streams.Add(stream);            }            catch (Exception ex)            {                ssss = ex.Message;            }            return stream;        }        private void Print(string printerName, out string msg)        {            msg = "";            //string printerName = this.TextBox1.Text.Trim();// "傳送至 OneNote 2007";            if (m_streams == null || m_streams.Count == 0)            {                msg = "没有要打印的数据，请重试";                return;            }                 PrintDocument printDoc = new PrintDocument();            if (printerName.Length > 0)            {                printDoc.PrinterSettings.PrinterName = printerName;                printDoc.DefaultPageSettings.Landscape = isLandSapces;            }            foreach (PaperSize ps in printDoc.PrinterSettings.PaperSizes)            {                if (ps.PaperName == "A4")                {                    printDoc.DefaultPageSettings.PaperSize = ps;                    // printDoc.PrinterSettings.IsDefaultPrinter;//知道是否是预设定的打印机                }            }            if (!printDoc.PrinterSettings.IsValid)            {                msg = String.Format("找不到打印机: " + printDoc.PrinterSettings.PrinterName);                System.Diagnostics.Debug.WriteLine(msg);                return;            }            printDoc.PrintPage += new PrintPageEventHandler(PrintPage);            printDoc.Print();        }        private void PrintPage(object sender, PrintPageEventArgs ev)        {            Metafile pageImage = new Metafile(m_streams[m_currentPageIndex]);         //设置高质量插值法            ev.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;            //设置高质量,低速度呈现平滑程度            ev.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;            ev.Graphics.DrawImage(pageImage, new System.Drawing.Rectangle(0, 0, ev.PageBounds.Width, ev.PageBounds.Height), new System.Drawing.Rectangle(0, 0, pageImage.Width, pageImage.Height), System.Drawing.GraphicsUnit.Pixel);            m_currentPageIndex++;            ev.HasMorePages = (m_currentPageIndex < m_streams.Count);                 }
       
      
     

调用：  new PrintHelper().Run(reportPath, printName, dtRep, "EleCostDetails", paramsList, true, out msg, reportWidth);

注意：

 

在report.Render()的时候，如果设置的reportWidth长度不够，则会生成几张拼接的图片，那么在打印的时候，不管怎么设置，打印出来的也是列表欠缺的报表，如上图所示。

public void Render(string format, string deviceInfo, CreateStreamCallback createStream, out Warning[] warnings);微软介绍与例子：

　　　　CreateStreamCallback委托（为 ReportViewer 控件提供流以进行呈现）。 微软的介绍： 

　　　　附上PrinterSettings类的微软介绍：