打印缩放我的WPF-GroupBox

Question

我试图从我的wpf应用程序打印出一些信息。我找到了一些代码来制作我想要打印的内容以适合一个页面，并且它很好地完成了这项工作。问题是，在打印我想要的内容后，该方法会缩小我的wpf控件，这是一个带有图表的组合框。我如何将groupbox的大小缩放到缩放前的大小？

private void PrintUT_Click(object sender, RoutedEventArgs e) 
    { 
     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.GBProsjektTimer.ActualWidth, capabilities.PageImageableArea.ExtentHeight/
          this.GBProsjektTimer.ActualHeight); 

      //Transform the Visual to scale 
      this.GBProsjektTimer.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.GBProsjektTimer, "First Fit to Page WPF Print"); 
     } 
    } 

Answer 1

找到答案！只需用您的对象替换objecToPrint即可。在我的情况下，这将是this.GBProsjektTimer.Width = double.Nan

    objectToPrint.Width = double.NaN; 
       objectToPrint.UpdateLayout(); 
       objectToPrint.LayoutTransform = new ScaleTransform(1, 1); 
       Size size = new Size(capabilities.PageImageableArea.ExtentWidth, 
            capabilities.PageImageableArea.ExtentHeight); 
       objectToPrint.Measure(size); 
       objectToPrint.Arrange(new Rect(new Point(capabilities.PageImageableArea.OriginWidth, 
             capabilities.PageImageableArea.OriginHeight), size));