Question

我正在尝试在WPF应用程序中打印WindowsFormsHost。如果WindowsFormsHost对象是由xaml创建的，它打印正常，但如果我在代码中创建WindowsFormsHost，它会打印一个空页。

如何在代码中创建WindowsFormsHost对象以使其打印输出？

以下是简化但有效的代码：

            PrintDialog dialog = new PrintDialog();
            if (dialog.ShowDialog() == true)
            {
                System.Windows.Forms.TextBox ctrl = new System.Windows.Forms.TextBox();
                ctrl.Text = "Test";
                ctrl.BackColor = System.Drawing.Color.Red;
#if RUNTIME
                WindowsFormsHost wfh = new WindowsFormsHost();
                wfh.Child = ctrl;
                FrameworkElement visual = wfh;
#else
                WFHostTest.Child = ctrl;
                FrameworkElement visual = WFHostTest;
#endif

                visual.Margin = new Thickness(0, 0, 0, 0);
                visual.Measure(new Size(dialog.PrintableAreaWidth, dialog.PrintableAreaHeight));   
                visual.Arrange(new Rect(0, 0, dialog.PrintableAreaWidth, dialog.PrintableAreaHeight)); 
                visual.UpdateLayout();
                dialog.PrintVisual(visual, "Test");
            }

此代码仅在未定义RUNTIME时打印TextBox。如果定义了RUNTIME，则会打印一个空页面。 WFHostTest在xaml中定义为

<WindowsFormsHost Grid.Column="1" Grid.Row="2" Name="WFHostTest" />

在WPF中动态创建WindowsFormsHost

0 个答案: