c# - 如何从 WinForms 打印多页？

Question

虽然网上有一些教程，但我仍然不明白为什么这不能正确打印多页。我做错了什么？

public static void printTest()
{
   PrintDialog printDialog1 = new PrintDialog();
   PrintDocument printDocument1 = new PrintDocument();

   printDialog1.Document = printDocument1;
   printDocument1.PrintPage += 
       new PrintPageEventHandler(printDocument1_PrintPage);

   DialogResult result = printDialog1.ShowDialog();
   if (result == DialogResult.OK)
   {
       printDocument1.Print();
   }       
}

static void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
{
   Graphics graphic = e.Graphics;
   SolidBrush brush = new SolidBrush(Color.Black);

   Font font = new Font("Courier New", 12);

   e.PageSettings.PaperSize = new PaperSize("A4", 850, 1100);

   float pageWidth = e.PageSettings.PrintableArea.Width;
   float pageHeight = e.PageSettings.PrintableArea.Height;

   float fontHeight = font.GetHeight();
   int startX = 40;
   int startY = 30;
   int offsetY = 40;

   for (int i = 0; i < 100; i++)
   {             
       graphic.DrawString("Line: " + i, font, brush, startX, startY + offsetY);
       offsetY += (int)fontHeight;

       if (offsetY >= pageHeight)
       {
           e.HasMorePages = true;
           offsetY = 0;
       }
       else {
           e.HasMorePages = false;
       }
   }
}

您可以在此处找到此代码打印结果的示例:Printed Document

Answer 1

你永远不会从循环中返回。将其更改为:

if (offsetY >= pageHeight)
{
    e.HasMorePages = true;
    offsetY = 0;
    return; // you need to return, then it will go into this function again
}
else {
    e.HasMorePages = false;
}

此外，您需要将循环更改为从第二页的当前编号开始，而不是再次以 i=0 重新启动。