最近做个项目遇到个棘手的问题，在做RDLC报表不预览直接打印功能时，调式状态下打印功能正常，但是发布后提示找不到打印机，计算机上已经安装了打印机。并且可用，请高手指教，源码如下：

        private IList<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) 
 
        {
            //将报表输出的数据保存为文件，使用FileStream对象。
            Stream stream = new MemoryStream();
            //Stream stream = new FileStream(name + "." + fileNameExtension, FileMode.Create); 
            m_streams.Add(stream);
            return stream;
          
 
        }
        /// <summary>
        /// 关闭当前所有文件流
        /// </summary>
         private void CloseStreams()
         {
             if (this.m_streams != null && this.m_streams.Count > 0)
             {
                 //foreach (Stream s in this.m_streams)
                 //{
                 //    s.SetLength(0);
                 //    s.Flush();
                 //    s.Close();
                 //}
                 this.m_streams.Clear();
             }
         }
        //将报表的内容输出为指定格式的数据流。
        private void Export(LocalReport report) 
 
        {

          
            string deviceInfo = "<DeviceInfo>" + "<OutputFormat>EMF</OutputFormat>" + "<PageWidth>8.54331</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
           {
               //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。
               report.Render("Image", deviceInfo, CreateStream, out warnings);

           }

           catch (Exception ex)
           {

               Exception innerEx = ex.InnerException;//取内异常。

               while (innerEx != null)
               {

                   //MessageBox.Show(innerEx.Message);
                  
                   innerEx = innerEx.InnerException;
                   throw (innerEx);

               }

           }
         
            
           

        }
        //打印响应事件处理
        private void PrintPage(object sender, PrintPageEventArgs ev) 
 
        {
            //Metafile对象用来保存EMF或WMF格式的图形，
            //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]);
            Rectangle adjustedRect = new Rectangle(
                                  ev.PageBounds.Left - (int)ev.PageSettings.HardMarginX,
                                  ev.PageBounds.Top - (int)ev.PageSettings.HardMarginY,
                                  ev.PageBounds.Width,
                                  ev.PageBounds.Height
                                  );
          
            // Draw a white background for the report

            ev.Graphics.FillRectangle(System.Drawing.Brushes.White, adjustedRect);

            // Draw the report content
            ev.Graphics.DrawImage(pageImage, adjustedRect);

            //指定是否横向打印  
            ev.PageSettings.Landscape = false;
         
            m_currentPageIndex++;
            //设置是否需要继续打印
            ev.HasMorePages = (m_currentPageIndex < m_streams.Count);
        }
        // 当前呈现的页
        private int m_currentPageIndex; 
        //打印
        private void Print() 
        {

            if (m_streams == null || m_streams.Count == 0) 
                return;
       
    
                PrintDocument printDoc = new PrintDocument();
               
                //判断指定的打印机是否可用
                if (!printDoc.PrinterSettings.IsValid)
                {

                    //MessageBox.Show("Can't find printer");

                    ClientScript.RegisterClientScriptBlock(this.GetType(), "HasSameRow", "<script type='text/javascript'>alert('找不到可用的打印机！')</script>");
                    return;

                }
                //声明PrintDocument对象的PrintPage事件，具体的打印操作需要在这个事件中处理。
                printDoc.PrintPage += new PrintPageEventHandler(PrintPage);
                //初始页设置
                m_currentPageIndex = 0;
                //执行打印操作，Print方法将触发PrintPage事件。
                printDoc.Print();
           
           
         
          
 
       }
        BLL_Invoice bllinvoice = new BLL_Invoice();
        Model.Invoice newInvoice = new Model.Invoice();
        //报表设置及执行打印报表
        private void Run()
        { 

            DataSet ds;
            ds = bllinvoice.SInvoice(newInvoice);
            DataTable dt;
            dt = bllinvoice.SInvoiceCuaddr(newInvoice);

            LocalReport report = new LocalReport();

            report.ReportPath = @"Page\Sales\SInvoicePrint.rdlc";//加上报表的路径 
            report.DataSources.Clear();
            report.DataSources.Add(new ReportDataSource("DSInvoice", ds.Tables[0].DefaultView));
            ReportParameter InvoiceID = new ReportParameter("Parameter_InvoiceNo", dt.Rows[0]["SaleInvoiceID"].ToString());
            report.SetParameters(new ReportParameter[] { InvoiceID });

            ReportParameter SaleDate = new ReportParameter("Parameter_Date", dt.Rows[0]["SaleOrderDate"].ToString());
            report.SetParameters(new ReportParameter[] { SaleDate });

            ReportParameter Route = new ReportParameter("Parameter_Route", dt.Rows[0]["RouteName"].ToString());
            report.SetParameters(new ReportParameter[] { Route });

            ReportParameter CustName = new ReportParameter("Parameter_CustName", dt.Rows[0]["CustomerName"].ToString());
            report.SetParameters(new ReportParameter[] { CustName });

            ReportParameter Addr = new ReportParameter("Parameter_Addr", dt.Rows[0]["Addr"].ToString());
            report.SetParameters(new ReportParameter[] { Addr });

            ReportParameter City = new ReportParameter("Parameter_City", dt.Rows[0]["City"].ToString());
            report.SetParameters(new ReportParameter[] { City });

            ReportParameter States = new ReportParameter("Parameter_States", dt.Rows[0]["States"].ToString());
            report.SetParameters(new ReportParameter[] { States });

            report.Refresh();
 
            Export(report); 

            Print();
           
       }
        //打印选中行
        protected void btnprint_Click(object sender, EventArgs e)
        { 
            int rowNO= int.Parse( HFSelectedRow.Value);
            Label lblInvoice = (Label)gv_SaleInvoiceList.Rows[rowNO - 1].FindControl("LBSaleInvoiceID");
            newInvoice.InvoiceID = lblInvoice.Text;
         
            if (newInvoice.InvoiceID!=null|| newInvoice.InvoiceID!="")
            {
                try
                {
                    Run();
                }
                catch (Exception ex)
                {
                    throw (ex);
                }
                finally
                {
                    CloseStreams();
                }
            }

        }