C# WPF PrintDialog 打印（2）

前面https://www.cnblogs.com/yinyu5/p/18633910使用PrintVisual方法只打印了可见部分的元素，所以这里改为使用PrintDocument方法来进行打印。

需要引用System.Printing.dll

界面代码：

<Window x:Class="WpfApp123.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:local="clr-namespace:WpfApp123"
        mc:Ignorable="d"
        Title="MainWindow" Height="600" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition Height="auto"></RowDefinition>
        </Grid.RowDefinitions>
        <Canvas x:Name="print_Canvas">
            <Ellipse Margin="10" Height="100" Width="300">
                <Ellipse.Fill>
                    <LinearGradientBrush>
                        <GradientStop Color="Purple" Offset="0"></GradientStop>
                        <GradientStop Color="DarkBlue" Offset="1"></GradientStop>
                    </LinearGradientBrush>
                </Ellipse.Fill>
            </Ellipse>
            <Rectangle Height="80" Width="200" Margin="400 30 0 0">
                <Rectangle.Fill>
                    <LinearGradientBrush>
                        <GradientStop Color="Red" Offset="0"></GradientStop>
                        <GradientStop Color="Green" Offset="0.5"></GradientStop>
                        <GradientStop Color="DarkBlue" Offset="1"></GradientStop>
                    </LinearGradientBrush>
                </Rectangle.Fill>
            </Rectangle>
            <TextBlock Canvas.Left="200" Canvas.Top="150" FontSize="50">
                ABCDEFG
            </TextBlock>
        </Canvas>
        <Grid Grid.Row="1">
            <DataGrid Name="print_dg">
            </DataGrid>
        </Grid>
        <Grid Grid.Row="2" Margin="10">
            <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                <Button Height="40" Width="200" FontSize="20" Margin="3" Click="Button_Click">打印Canvas</Button>
                <Button Height="40" Width="200" FontSize="20" Margin="3" Click="Button1_Click">打印DataGrid</Button>
            </StackPanel>
        </Grid>
    </Grid>
</Window>

使用PrintDocument方法的后台代码：

private void PrintDocument_Method()
        {
            PrintDialog printDialog = new PrintDialog();
            printDialog.PrintQueue = LocalPrintServer.GetDefaultPrintQueue();
            printDialog.PageRangeSelection = PageRangeSelection.AllPages;
            if (printDialog.ShowDialog() == true)
            {
                FixedDocument fixedDoc = new FixedDocument();
                Size pageSize = new Size(printDialog.PrintableAreaWidth, printDialog.PrintableAreaHeight);
                PageContent pageContent = new PageContent();
                FixedPage fixedPage = new FixedPage();
                fixedPage.Width = pageSize.Width;
                fixedPage.Height = pageSize.Height;

                Canvas canvas = new Canvas();
                canvas.Height = print_Canvas.Height;
                canvas.Width = print_Canvas.Width;
                //复制Canvas里面的元素
                foreach (UIElement element in print_Canvas.Children)
                {
                    UIElement clonedElement = CloneElement(element);
                    canvas.Children.Add(clonedElement);
                }
                fixedPage.Children.Add(canvas);
                ((IAddChild)pageContent).AddChild(fixedPage);
                fixedDoc.Pages.Add(pageContent);
                printDialog.PrintDocument(fixedDoc.DocumentPaginator, "打印 Canvas");
            }
        }

        private UIElement CloneElement(UIElement element)
        {
            // 使用 XAML 序列化反序列化来实现 UIElement 的深度复制
            string xamlString = System.Windows.Markup.XamlWriter.Save(element);
            return (UIElement)System.Windows.Markup.XamlReader.Parse(xamlString);
        }

可以看到被遮挡的元素也能打印出来：

那么DataGrid中遮挡的数据该如何打印呢？特别是数据行数较多，可能需要多页打印时。

还是使用PrintDocument，这里做一个简单的分页处理。

C# WPF PrintDialog 打印（3）： 

https://www.cnblogs.com/yinyu5/p/18634133