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。