如何以编程方式从PrintDocument打印特定页面

本文关键字：打印 PrintDocument 编程 方式 | 更新日期: 2023-09-27 18:11:25

是否有一种方法可以仅从System.Drawing.Printing.PrintDocument以编程方式打印选定的页面(例如:3 - 5页)?

我正在使用这个代码:

myPrintDocument.Print();

但是这样我就不能以编程方式跳过页面了。我考虑过显示PrintDialog类的修改版本的可能性，跳过我不想要的页面，打印文档并以编程方式关闭PrintDialog窗口(以便它只闪烁)。但是那样会有点麻烦。

如何以编程方式从PrintDocument打印特定页面

可以在PrintDocument.BeginPrint事件中设置PrinterSettings

放置打印代码的PrintDocument.PrintPage事件将由Print Controller for Every Page引发，直到PrinterSettings中设置的最后一页。例如，如果您有一个10页的PrintDocument，并且您设置了PrintDocument.PrinterSettings.ToPage = 5，那么打印控制器将为每个页面引发PrintPage事件，直到它处理第5页。

如果您跳过页面，例如从PrinterSettings.FromPage = 3跳到ToPage = 5，那么打印控制器将引发PrintPage事件3次。从3到5，每次计数一个PrintPage事件。

打印控制器不决定PrintPage事件打印什么内容。对于范围内的每个计算页面，它只引发一次事件。例如，如果您将FromPage = 4指定为FromPage = 6，打印控制器将引发完全相同数量的PrintPage事件，而且它甚至不知道其中的区别!它不知道用PrintPage事件打印的是哪个页面。它只知道触发PrintPage事件3次。

我的观点是，你的代码在PrintPage事件必须处理所有你跳过的页面没有绘制任何东西。然后，在同一个PrintPage事件中的代码必须处理并绘制"当前页面"。然后返回，以便打印控制器可以引发下一个PrintPage事件。

下面是伪代码: 
void Setup_Printing()
{
  myPrintDocument.BeginPrint += On_BeginPrint;
  myPrintDocument.PrintPage += On_PrintPage;
}
// Page Index variable
int indexCuurentPage = 0;
void On_BeginPrint(object sender, PrintEventArgs e)
{
  indexCuurentPage = 0;
  ((PrintDocument)sender).PrinterSettings.PrintRange = PrintRange.SomePages;
  ((PrintDocument)sender).PrinterSettings.FromPage = 3;
  ((PrintDocument)sender).PrinterSettings.ToPage = 5;
}

void On_PrintPage(object sender, PrintPageEventArgs ppea)
{
  // Set up a loop to process pages.
  bool bProcessingPages = true;
  while (bProcessingPages)
  {
    indexCurrentPage++;
    // Set isPageInRange flag to true if this indexCurrentPage is in the selected range of pages
    bool isPageInRange = (theCurrentPage >= ppea.PageSettings.PrinterSettings.FromPage);
    isPageInRange = isPageInRange && (theCurrentPage =< ppea.PageSettings.PrinterSettings.ToPage);
    if (isPageInRange)
    {
      // Process your data and print this page then exit the loop.  
      try
      {
        //// TO DO - Process Data ////
        //// TO DO - Draw Data to ppea.Graphics ////
        // Note:  Do not set the ppea.HasMorePages to true.  Let the Printer Controller do it.
      }
      catch
      {
        // Abort printing more pages if there was an error.
        ppea.HasMorePages = false;
      }
      // Set the loop exit flag.  We could use "return;" instead if we do not want to do more.
      bProcessingPages = false;
    }
    else
    {
      // Process your data and Do Not Draw on the ppea.Graphics.
      try
      {
        //// TO DO - Process Data ////
      }
      catch
      {
        // Abort printing more pages if there was an error.
        ppea.HasMorePages = false;
        // Set the loop exit flag.  We could use "return;" instead if we do not want to do more.
        bProcessingPages = false;
      }
      // Stay in the processing loop until you either need to actually Print a Page
      // or until you run out of data and pages to print.
    }
    // check to see if we ran out of pages to print
    if (indexCurrentPage >= ppea.PageSettings.PrinterSettings.ToPage)
    {
      // Done.  We do not need to set the HasMorePages = false
      bProcessingPages = false;
    }
  } // end while processing pages
  // The print controller will decide to raise the next PrintPage event if it needs to.
  // If You set the ppea.HasMorePages = false, then it will stop any more page events. 
  // If You set the ppea.HasMorePages = true, 
  //    then I'm not sure what the print controller will do if it ran out of pages!
}

这样怎么样?

PrinterSettings printSettings = new PrinterSettings()
            {
                FromPage = 3,
                ToPage = 5
            };
PrintDocument myPrintDocument = new PrintDocument()
            {
                PrinterSettings = printSettings
            };
myPrintDocument.Print();
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