如何使用 c# 打印 wpf 用户控件？

Question

我有一个用户控件，我在其中显示地图和数据网格中的数据。

我尝试了以下代码，但它不起作用。

        PrintDialog printDialog = new PrintDialog();

        // if user clicks on cancel button of print dialog box then no need to print the map control
        if (!(bool)printDialog.ShowDialog())
        {
            return;
        }
        else // this means that user click on the print button
        {
            // do nothing
        }

        this.Measure(new Size(printDialog.PrintableAreaWidth, printDialog.PrintableAreaHeight));
        this.Arrange(new Rect(new Point(20, 20), new Size(this.ActualWidth, this.ActualHeight)));

        // print the map control
        printDialog.PrintVisual(this, "Karte drucken");

问题：当数据网格有大量记录时，用户控件获得滚动条，但打印用户控件后，只打印用户控件的可见部分，而不是我们向下滚动后可以看到的数据存在.我想打印用户控件的全部内容。

有什么解决办法吗，我们如何在 wpf 中看到打印预览？

Answer 1

请检查以下链接，它应该会有所帮助。 Print Preview WPF

代码

 PrintDialog printDlg = new System.Windows.Controls.PrintDialog();
if (printDlg.ShowDialog() == true)
  {
   //get selected printer capabilities
   System.Printing.PrintCapabilities capabilities = printDlg.PrintQueue.GetPrintCapabilities(printDlg.PrintTicket);

   //get scale of the print wrt to screen of WPF visual
   double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / this.ActualWidth, capabilities.PageImageableArea.ExtentHeight /
          this.ActualHeight);

   //Transform the Visual to scale
   this.LayoutTransform = new ScaleTransform(scale, scale);

   //get the size of the printer page
   Size sz = new Size(capabilities.PageImageableArea.ExtentWidth, capabilities.PageImageableArea.ExtentHeight);

   //update the layout of the visual to the printer page size.
   this.Measure(sz);
   this.Arrange(new Rect(new Point(capabilities.PageImageableArea.OriginWidth, capabilities.PageImageableArea.OriginHeight), sz));

   //now print the visual to printer to fit on the one page.
   printDlg.PrintVisual(this, "First Fit to Page WPF Print");

}