c# - WPF 打印问题

Question

当我选择 Microsoft XPS Document Writer 作为打印机时，我的输出是完美的，但是当我选择我的 HP 1020 打印机时，打印机输出空白副本...以下是代码...

private void printButton_Click(object sender, RoutedEventArgs e)
    {
        PrintInvoice pi = new PrintInvoice();
        pi.DataContext = this.DataContext;
        PrintDialog printDlg = new System.Windows.Controls.PrintDialog();
        if (printDlg.ShowDialog() == true)
        {
            pi.Margin = new Thickness(30);

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

Answer 1

这可能是由多种不同的原因造成的。您可以添加几个步骤，如果正确执行，可能会 cause the flying men to return with goods and knowledge.

首先，您应该缩放到打印页面(来自 a2zdotnet 的代码):

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, "Code ganked from http://www.a2zdotnet.com/View.aspx?id=66");

cargo-cult 代码在 Measure 和 Arrange 步骤中。通常，如果您调用 Measure 并传入一个 new Size(Double.MaxValue, Double.MaxValue)，这就是您需要做的所有事情。

第二个仪式涉及碰撞调度员。

visual.DataContext = foo;
Dispatcher.Invoke((Action)()=>{;}); // bamp
// print here

试试这些，看看是否有帮助。