打印运行时用户控件 silverlight 4

Question

我的 silverlight 应用程序有一个用户控件（称为 CertificatePrintControl），用于显示和打印一些信息。 我想在另一个控件内实例化 printCtl 并在运行时打印内容。 例子是：

foreach (var certId in CertToPrint)
    {
        var certPrintController = new CertificatePrintControl() { PrintDocument = pd, CertGuid = certId };
        certPrintController.Print();
        certPrintController = null;
    }

问题是在CertificatePrintControl内部有这段代码，

    void pd_PrintPage(object sender, PrintPageEventArgs e)
    {
        try
        {
            var oldW = lstMainPrintCertificate.Width;
            var oldH = lstMainPrintCertificate.Height;
            lstMainPrintCertificate.Width = e.PrintableArea.Width;
            lstMainPrintCertificate.Height = e.PrintableArea.Height;
            e.PageVisual = lstMainPrintCertificate;
            lstMainPrintCertificate.Width = oldW;
            lstMainPrintCertificate.Height = oldH;
        }
        catch (Exception ex)
        { 
            //
        }
    }

我

 {System.InvalidOperationException: Element is already the child of another element.
   at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.SetValue(IManagedPeerBase obj, DependencyProperty property, DependencyObject doh)
   at System.Windows.Printing.PrintPageEventArgs.set_PageVisual(UIElement value)
   at com.breathesaftey.Control.CertificatePrintControl.pd_PrintPage(Object sender, PrintPageEventArgs e)}

可能已经理解了原因，但我找不到解决方法。

谢谢

Answer 1

我发现了这个 Silverlight reporting

并且解决了这个问题...