在WinForms中打印多个页面；不起作用

本文关键字：不起作用 WinForms 打印 | 更新日期: 2023-09-27 18:25:10

来自问题

答案很快，我偶然发现了升级后的问题。

我已经更改了我的程序以从DB中填充一些数据集。

我在printDocument上调用Print()，一切正常，它只是不想注册我的e.HasMorePages = true;

这是代码：

   public static void printDokument()
   {
       if (result == DialogResult.OK)
       {
           DbDataPostavke = checkDB("SELECT * FROM " + tipDokumenta + "_postavke WHERE ID_" + tipDokumenta + " = " + stDokumenta);
           list = DbDataPostavke.Tables[0].AsEnumerable().ToList();                             
           printDocument.Print();
       }       
   }
   static void printDocument_PrintPage(object sender, PrintPageEventArgs e)
   {
       graphic = e.Graphics;
       e.PageSettings.PaperSize = ps;
       stranSirina = e.PageSettings.PrintableArea.Width;
       stranVisina = e.PageSettings.PrintableArea.Height;
       fontHeight = font.GetHeight();
       //this works/prints
       printDocument_PrintHeader();
       //this works/prints
       printDocument_PrintDocumentInfo();
       if (firstPage) printDocument_PrintSupplierInfo();    
       //Lines that I take from DB, amount of this lines is variable //it only prints one page, then it stops printing
       printDocument_PrintProductLines(e);
       //Sum of lines
       if(zadnjaStran) printDocument_printSum();
       //prints comment on document
       if (zadnjaStran) printDocument_PrintComment();
       //footer
       printDocument_PrintFooter();
   }
   static void printDocument_PrintProductLines(PrintPageEventArgs e)
   {
       //I print some stuff here (header, etc..) 
       String stranArtikliVrstica = String.Empty; // string for one line of data
       DataRow dataRow1 = null;
       DataRow dr = null;
       for(int i = 0; i < list.Count(); i++)
       {
           dr = list[i];
           dataRow1 = poglejBazo("SELECT ime, EM, opis FROM Sifrant WHERE ID = " + dr[2].ToString()).Tables[0].Rows[0];
           stranArtikliVrstica = String.Format("{0,-38}  {1,10}  {2,5}  {3,9:C}  {4,9:C}", dataRow1[0].ToString() + " - " + dataRow1[2].ToString(), dr[3].ToString(), dataRow1[1].ToString(), dr[4], Convert.ToInt16(dr[3]) * Convert.ToInt16(dr[4]));
           list.Remove(dr);
           graphic.DrawString(stranArtikliVrstica, font, brush, startX + offsetX, startY + offsetY);
           offsetY += (int)font.GetHeight();
           //if there is less then 35 "lines" remaining, we have enough space for printing some other stuff, otherwise, that stuff doesn't print..
           if (list.Count() < 35) zadnjaStran = true;
           else zadnjaStran = false;
           if (offsetY > stranVisina - 50)
           {
               prvaStran = false;
               stevecStrani++;
               offsetY = 0;
               e.HasMorePages = true;
               return;
           }
       }
   }

因此，当我尝试用一页打印文档时，一切都可以，但如果我尝试用多页打印文档，只有第一页打印（页眉、DocumentInfo、SupplierInfo、ProductLines（80行中约有38行）、页脚），然后就没有更多的页面了（我正在测试打印成PDF文件。）

我做错了什么？

PrintProductLines中的e参数有问题吗？我如何告诉函数PrintProductLines我想从原始函数触发e上的HasMorePages？我知道我可以通过引用传递它，但ref关键字在我的情况下不起作用：S

编辑：

更改static void printDocument_PrintProductLines(ref PrintPageEventArgs e)和printDocument_PrintProductLines(ref e);会引发错误：

错误2参数1必须与关键字"ref"一起传递
错误1的最佳重载方法匹配'GZIG.globalClass.printDocument_PrintPostavke（参考System.Drawing.Printing.PrintPageEventArgs）'有一些无效自变量

在WinForms中打印多个页面；不起作用

您不应该将这样的打印代码放入静态全局类中。

此例程属于将使用Graphics对象的类的实际实例。

private const int PAD = 4;
private int m_Line, m_LinesToPrint;
private Font m_Font;
private PrintDocument m_Doc;
private void print_Click(object sender, EventArgs e) {
  using (var dlg = new PrintPreviewDialog()) {
    if (m_Doc == null) {
      throw new NullReferenceException("Create the document before trying to print it.");
    }
    dlg.Document = m_Doc;
    m_Line = 0;
    m_LinesToPrint = list.Count;
    m_Font = new Font("Courier New", 14, FontStyle.Underline, GraphicsUnit.Point);
    dlg.ShowDialog();
  }
}
private void printDocument1_PrintPage(object sender, PrintPageEventArgs e) {
  float lineHeight = m_Font.GetHeight(e.Graphics) + PAD;
  float yLineTop = e.MarginBounds.Top;
  for ( ; m_Line < m_LinesToPrint; m_Line++) {
    if (e.MarginBounds.Bottom < (yLineTop + lineHeight)) {
      e.HasMorePages = true;
      return;
    }
    DataRow dr = list[m_Line];
    DataRow row1 = poglejBazo("SELECT ime, EM, opis FROM Sifrant WHERE ID = " + dr[2].ToString()).Tables[0].Rows[0];
    string strText = String.Format("{0,-38}  {1,10}  {2,5}  {3,9:C}  {4,9:C}", dataRow1[0].ToString() + " - " + dataRow1[2].ToString(), dr[3].ToString(), dataRow1[1].ToString(), dr[4], Convert.ToInt16(dr[3]) * Convert.ToInt16(dr[4]));
    // list.Remove(list[m_Line]) <= DO NOT DO THAT!
    e.Graphics.DrawString(strText, m_Font, Brushes.Black, new PointF(e.MarginBounds.Left, yLineTop));
    yLineTop += lineHeight;
  }
  e.HasMorePages = false;
}
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