解决RDLC报表自带打印，弹出打印界面后，经常须按两次打印才执行

     这段时间做报表，用RDLC客户老是反应，打印要按几次才可以打印，自己测试了一下，发现果真是存在这个问题，貌似自带的打印是在弹出打印窗口后，第一次点击是先将当前窗体激活，第二次点击才会真正的触发打印事件，查询：http://msdn.microsoft.com/zh-cn/library/ms252091(v=vs.100).aspx

修改了里面几个地方，如下：

using System;
using System.IO;
using System.Data;
using System.Text;
using System.Drawing.Imaging;
using System.Drawing.Printing;
using System.Collections.Generic;
using System.Windows.Forms;
using Microsoft.Reporting.WinForms;
using System.Drawing;

namespace YMParking.ParkingMg
{
    public class Print
    {
        int m_currentPageIndex;
        IList<Stream> m_streams;


        // 摘要:
        //     为 ReportViewer 控件提供流以进行呈现。
        //
        // 返回结果:
        //     ReportViewer 控件可以写入数据的 Stream 对象。
        private Stream CreateStream(string name,
          string fileNameExtension, Encoding encoding,
          string mimeType, bool willSeek)
        {
            Stream stream = new MemoryStream();
            m_streams.Add(stream);
            return stream;
        }
        /// <summary>
        /// 将报表文件按指定的格式导出
        /// </summary>
        /// <param name="report">报表文件</param>
        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>();
            report.Render("Image", deviceInfo, CreateStream,
               out warnings);
            foreach (Stream stream in m_streams)
                stream.Position = 0;
        }
        // Handler for PrintPageEvents
        private void PrintPage(object sender, PrintPageEventArgs ev)
        {
            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);


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


            ev.Graphics.DrawImage(pageImage, adjustedRect);

            m_currentPageIndex++;
            ev.HasMorePages = (m_currentPageIndex < m_streams.Count);
        }
        /// <summary>
        /// 打印
        /// </summary>
        /// <param name="IsShowPrint">是否弹出打印窗口</param>
        private void PrintFiel(bool IsShowPrint)
        {
            if (m_streams == null || m_streams.Count == 0)
                throw new Exception("指定的打印的文件错误");
            PrintDocument document;
            if (IsShowPrint)
            {
               
                PrintDialog pd = new PrintDialog();
                if (pd.ShowDialog() == DialogResult.OK)
                {
                    document = new PrintDocument();
                    pd.Document = document;
                }
                else
                {
                    return;
                }

            }
            else
            {
                document = new PrintDocument();
            }
            if (!document.PrinterSettings.IsValid)
            {
                throw new Exception("连接打印机出错");
            }
            else
            {

                document.PrintPage += new PrintPageEventHandler(PrintPage);
                m_currentPageIndex = 0;
                document.Print();
            }


        }

        public void Run(LocalReport report, bool IsShowPrint)
        {
            
            Export(report);
            PrintFiel(IsShowPrint);
        }

        public void Dispose()
        {
            if (m_streams != null)
            {
                foreach (Stream stream in m_streams)
                    stream.Close();
                m_streams = null;
            }
        }


    }
}

写了这个共用的类，重写reportViewer打印事件，

 private void reportViewer1_Print(object sender, CancelEventArgs e)

        {

            e.Cancel = true;

            Print pt = new Print();

            pt.Run(reportViewer1.LocalReport, true);

        }

到此，问题解决了。