在 WinForms 中打印多页不起作用

Question

来自 问题

很快就得到了回答，我绊倒了升级后出现问题。

我已经更改了程序以从数据库填充一些数据集。

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，当我尝试打印单页文档时，一切正常，但如果我尝试打印多页文档，则仅打印第一页（标题、文档信息、供应商信息、产品线（80 行中大约有 38 行） ),页脚），然后就没有更多页面了（我正在测试打印成 PDF 文件..）

我做错了什么？

PrintProductLines 中的 e 参数是否有问题？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);< /code> 抛出错误：

错误 2 参数 1 必须使用“ref”关键字传递
错误 1 ​​最佳重载方法匹配 'GZIG.globalClass.printDocument_PrintPostavke（参考 System.Drawing.Printing.PrintPageEventArgs)' 有一些无效 论点

Answer 1

您不应该将这样的打印代码放入静态全局类中。

该例程属于将使用 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;
}