Question

我搜索了如何打印WPF控件的选项，并找到了一些解决方案。我需要将我的打印控件适合打印页面，同时保留纵横比（我的控件是正方形;数独网格）。

我找到了一个解决方案，可以调整大小并重新定位控件以适应页面。这很好用，但它也重新定位了我窗口上的控制权。

这是我用于打印和缩放的代码：

        //get selected printer capabilities
            System.Printing.PrintCapabilities capabilities = dialog.PrintQueue.GetPrintCapabilities(dialog.PrintTicket);
        //get scale of the print wrt to screen of WPF visual
        double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / mrizka.ActualWidth, capabilities.PageImageableArea.ExtentHeight / mrizka.ActualHeight);

        //Transform the Visual to scale
        mrizka.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.
        mrizka.Measure(sz);
        mrizka.Arrange(new Rect(new Point(capabilities.PageImageableArea.OriginWidth, capabilities.PageImageableArea.OriginHeight), sz));

        dialog.PrintVisual(mrizka, mrizka.getID().ToString());

我试过两个方法来解决这个问题：

克隆我的控件，然后转换克隆的一个，不影响原始。没有工作，由于某种原因，我以异常结束：提供的DependencyObject不是这个Freezable的上下文，但奇怪的是仅在某些情况下。
还原尺寸和位置更改。我尝试调用InvalidateArrange（）方法，这似乎有效，但只在第一次调用print方法时才有效。在第二次通话期间，它没有用。

我应该做什么，任何想法＆lt;谢谢。

Answer 1

我知道这个问题很老，但我自己也在寻找解决这个问题的方法。这是我目前使用的解决方案。我将原始转换存储在框架元素中，然后在打印完成后重新应用它。

    private void Print(Visual v)
    {

        System.Windows.FrameworkElement e = v as System.Windows.FrameworkElement ;
        if (e == null)
            return;

        PrintDialog pd = new PrintDialog();
        if (pd.ShowDialog() == true)
        {
            //store original scale
            Transform originalScale = e.LayoutTransform;
            //get selected printer capabilities
            System.Printing.PrintCapabilities capabilities = pd.PrintQueue.GetPrintCapabilities(pd.PrintTicket);

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

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

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

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

            //now print the visual to printer to fit on the one page.
            pd.PrintVisual(v, "My Print");

            //apply the original transform.
            e.LayoutTransform = originalScale;
        }
    }

Answer 2

    private void DrawGrap_Click(object sender, RoutedEventArgs e)
    {
        // Visual v = sender as Visual;
        Visual v = song2Grid as Visual;   // the object (it is a DataGrid) that you want to print out, not a window
        PrintDialog prtDlg = new PrintDialog();
        if (prtDlg.ShowDialog() == true)
        {
            // because 96 pixels in an inch for WPF window
            double marginLeft = 96.0 * 0.75; // left margin is 0.75 inches
            double marginTop = 96.0 * 0.75; // top margin is 0.75 inches
            double marginRight = 96.0 * 0.75; // right margin is 0.75 inches
            double marginBottom = 96.0 * 0.75; // bottom margin is 0.75 inches

            // the following steps do not works for a WPF window
            FrameworkElement win = v as FrameworkElement;
            Transform oldLayoutTransform = win.LayoutTransform;
            Size oldSize = new Size(win.ActualWidth, win.ActualHeight);

            System.Printing.PrintCapabilities pCapability = prtDlg.PrintQueue.GetPrintCapabilities(prtDlg.PrintTicket);

            // calculate print area that you want
            double printWidth = (pCapability.PageImageableArea.ExtentWidth - pCapability.PageImageableArea.OriginWidth)
                                - (marginLeft + marginRight);
            double printHeight = (pCapability.PageImageableArea.ExtentHeight - pCapability.PageImageableArea.OriginHeight)
                - (marginTop + marginBottom);

            // calculate the scale
            double scale = Math.Min(printWidth / oldSize.Width , printHeight / oldSize.Height);
            if (scale > 1.0)
            {
                // keep the original size and layout if printable area is greater than the object being printed
                scale = 1.0; 
            }

            // store the original layouttransform
            win.LayoutTransform = new ScaleTransform(scale, scale);

            // new size of the visual
            Size newSize = new Size(oldSize.Width*scale , oldSize.Height*scale);
            win.Measure(newSize);

            // centralize print area
            double xStartPrint = marginLeft + (printWidth - newSize.Width)/2.0;
            double yStartPrint = marginTop + (printHeight - newSize.Height)/2.0;
            win.Arrange(new Rect(new Point(xStartPrint,yStartPrint),newSize));

            // print out the visual
            prtDlg.PrintVisual(win as Visual, "PrintTest");

            // resotre the original layouttransform and size on screen
            win.LayoutTransform = oldLayoutTransform;
            win.Measure(oldSize);
            win.Arrange(new Rect(new Point(0,0),oldSize));
        }
    }

这是对user1018711提出的问题的回答。使用C＃和WPF在一个打印机页面上打印。当你想要打印出一个视觉效果时，它可能是一个包含许多控件的控件（例如Button，DataGrid，TextBlock，Label等）。在这里，我想将一个名为song2Drid的DataGrid打印到打印机，但其内容大于打印机的页面大小（其宽度比纸张的宽度宽），因此它被截断。我无法看到所有这些，所以我不得不缩放视觉，但我想保持比例与旧的相同。

我还将纸张边距设置为0.75英寸，纸张的左侧，顶部，右侧和底部。我还将视觉内容（song2Grid）集中在纸上。所以我可以在纸张的中心看到打印的内容。但是如果visual是一个类似Application.Current.MainWindow的窗口或者是由新的Window（）以编程方式创建的窗口，那么它将不会被缩放。这意味着这个方法不适用于Window对象。

此外，如果您想要通过缩放打印来恢复屏幕上的原始外观，那么您必须具有以下语句： win.LayoutTransform = oldLayoutTransform; win.Measure（oldSize）; win.Arrange（new Rect（new Point（0,0），oldSize））;

WPF打印以适合页面

2 个答案: