Wpf PrintDialog.PrintVisualElements是否为非活动VisualElements？ 介绍

我有一个带有主窗口（MVVM）的应用程序，它由一个带有5个选项卡的

TabViewer

组成。每个选项卡包含一个

滚动查看器

、一个

网格

和

网格

中的几个

用户控件

（MVC）

我的主窗口的Xaml：

<Window x:Class="CharacterSheetGenerator.View.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:ctrl="clr-namespace:CharacterSheetGenerator.Control"
    xmlns:help="clr-namespace:CharacterSheetGenerator.Helpers"
    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
    mc:Ignorable="d"
    Title="MainWindow" Height="1600" Width="1320" Loaded="Window_Loaded">
<Grid Name="MainGrid">
    <Grid.RowDefinitions>
        <RowDefinition Height="40"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Top">
        <Button Name="SaveButton" Command="{Binding LoadCommand}" Width="40" Height="30">
            <Image Source="/images/LoadButtonPicture.png"/>
        </Button>
        <Button Name="LoadButton" Command="{Binding SaveCommand}" Width="40" Height="30">
            <Image Source="/images/SaveButtonpicture.png" />
        </Button>
        <!-- Print Button currently in xaml.cs of my MainWindow -->
        <Button Name="Print Button" Click="Button3_Click" Width="40" Height="30">
            <Image Source="/images/PrintButtonPicture.png"/>
        </Button>
    </StackPanel>
    <TabControl Grid.Row="1">
        <TabItem Width="75" Height="20" Header="Übersicht">
            <ScrollViewer HorizontalScrollBarVisibility="Disabled" >
                <i:Interaction.Behaviors>
                    <help:BubbleScrollEvent />
                </i:Interaction.Behaviors>
                <!-- Grid I'd like to print -->
                <Grid Name="Übersicht">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="30"/>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="30"/>
                </Grid.ColumnDefinitions>
                <Grid Grid.Column="1">
                    <Grid.RowDefinitions>
                    <RowDefinition Height="20"/>
                    <RowDefinition Height="180"/>
                    <RowDefinition Height="*"/>
                </Grid.RowDefinitions>
                <StackPanel Orientation="Horizontal" Grid.Row="1">
                    <StackPanel>
                        <TextBlock FontSize="34" FontWeight="Bold" Text="Heldendokument"/>
                        <TextBlock FontSize="20" Text="Persönliche Daten" TextAlignment="Center"/>
                    </StackPanel>
                        <ctrl:CharacterAttributes VerticalAlignment="Top" AttributeList="{Binding Attributes, Mode=TwoWay}"/>
                </StackPanel>

                            <Grid Grid.Row="2">
                                <StackPanel>
                                <ctrl:CharacterOverview VerticalAlignment="Top" CharacterInformation="{Binding CharacterInformation}" StatusValues="{Binding StatusValues, Mode=TwoWay}" Traits="{Binding Traits, Mode=TwoWay}" Expirience="{Binding Expirience}" TraitClickCommand="{Binding OpenTraitViewCommand}"/>
                                </StackPanel>
                            </Grid>
                        </Grid>

            </Grid>
            </ScrollViewer>
        </TabItem>
        <TabItem Width="75" Height="20" Header="Fertigkeiten">
            <ScrollViewer HorizontalScrollBarVisibility="Disabled">
                <i:Interaction.Behaviors>
                    <help:BubbleScrollEvent />
                </i:Interaction.Behaviors>
                    <!-- Second Grid I'd like to print -->
                <Grid Name="Fertigkeiten">
                    <!-- [...] -->
        </TabItem>
        <!-- [...] -->

现在，这方面存在一些问题：

• 自应用程序启动以来未加载的所有

  UserControls

  都将是emtpy（我的第二个页面有一个数据网格。行仍然存在，但缺少所有值）

• 如果某个选项卡已打开，但不是当前打开的选项卡，则UserControls有其数据，但没有相应地调整大小（青色点线也有同样的问题）

让我向您展示我的第二个选项卡的示例：（这些是扫描的DinA4页）

第一个问题：（您可以看到带有彩色框的UserControl仍然有效，因为它已经加载到第一页）

第二期：

仍然缺少一些代码？转到“我的”并克隆该项目，自己尝试。

问题：

• 是什么导致了这种可以说是奇怪的行为，我该如何解决它？
• 除了printDialog.PrintVisual（）之外，还有其他方法可以打印我的页面吗？

---

问题用户控件通常如何获得布局？从数据模板还是什么？当您执行此过程时，他们的ViewModel可能不包含这些数据吗？我的UserContrls使用MVC模式。我没有指定他们的DataContext，而是将他们的孩子的DataContext设置为他们的

DependencyProperties

like

DataContext本身是一个被标记的依赖属性，因此它继承了可视化树。因此，如果设置窗口的datacontext，则其中的usercontrol将具有相同的datacontext。就像usercontrol中的datagrid一样。datagrid中的行具有它们在itemssource中对应的任何项的datacontext。列是一种抽象。
   //I tried to create an array and iterate through it
     System.Windows.FrameworkElement[] elements = { Übersicht as System.Windows.FrameworkElement, Fertigkeiten as System.Windows.FrameworkElement, Kampf as System.Windows.FrameworkElement,
                                                       Zauber as System.Windows.FrameworkElement, Inventar as System.Windows.FrameworkElement,};

        PrintDialog printDialog = new PrintDialog();
        if (printDialog.ShowDialog() == true)
        {

            foreach (FrameworkElement e in elements)
            {

                //store original scale
                Transform originalScale = e.LayoutTransform;
                //get selected printer capabilities
                System.Printing.PrintCapabilities capabilities = printDialog.PrintQueue.GetPrintCapabilities(printDialog.PrintTicket);


                //get scale of the print wrt to screen of WPF visual
                double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / 1281, capabilities.PageImageableArea.ExtentHeight /
                               1800); // I had to change ActualWidth and Height to static Values, as Grids in Tabs, which haven't been opened at least once since the start of the application had no actual size

                //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.
                printDialog.PrintVisual(e, "My Print");

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

            }

        }