在打印之前使用WPF窗口作为可视模板

时间:2015-12-11 15:21:13

标签: c# wpf templates

我正在制作一个用于打印标签的WPF应用程序。我想将标签模板设计为WPF窗口。在另一个类中,我将实例化这个“窗口模板”,在运行时填充属性并打印标签。我无法在打印前在屏幕上显示标签,因此我无法在此窗口实例上调用.ShowDialog()。这将在稍后发挥作用。

过去一周我一直在研究这个问题,我发现了两种方法几乎可以单独做我想要的东西,如果我能把它们组合起来它会起作用,但我错过了一块。

可以让这个工作,但按照这里的步骤 Printing in WPF Part 2

这实现了打印文档的基础知识。但是,我无法使用我的模板,我必须将代码中的所有内容放在后面。这是一个可行的选择,但我想更多地探索模板的想法。

        PrintDialog pd = new PrintDialog();
        FixedDocument document = new FixedDocument();
        document.DocumentPaginator.PageSize = new System.Windows.Size(pd.PrintableAreaWidth, pd.PrintableAreaHeight);

        FixedPage page1 = new FixedPage();
        page1.Width = document.DocumentPaginator.PageSize.Width;
        page1.Height = document.DocumentPaginator.PageSize.Height;


        // add some text to the page
        Label _lblBarcode = new Label();
        _lblBarcode.Content = BarcodeConverter128.StringToBarcode(palletID);
        _lblBarcode.FontFamily = new System.Windows.Media.FontFamily("Code 128");
        _lblBarcode.FontSize = 40;
        _lblBarcode.Margin = new Thickness(96);
        page1.Children.Add(_lblBarcode);


        // add the page to the document
        PageContent page1Content = new PageContent();
        ((IAddChild)page1Content).AddChild(page1);
        document.Pages.Add(page1Content);


        pd.PrintQueue = new System.Printing.PrintQueue(new System.Printing.PrintServer(), "CutePDF Writer");
        pd.PrintDocument(document.DocumentPaginator, "PalletID");

我只是在这里展示我如何打印条形码。在实际的程序中,我会在标签上添加所有内容并定位它。

在这个类中,我实例化我的标签,填充其属性,并尝试将其添加到FixedPage的子项 - 但它返回此错误。

Specified element is already the logical child of another element. Disconnect it first.

为了解决这个问题,我可以从模板中删除每个UI元素,然后将其添加到我的固定文档中。这似乎不是最干净的解决方案,但它是可能的。

然后我想遍历此列表中的每个UIElement,而不是从我的模板中手动删除每个元素并将其添加到我的固定文档中。如果标签需要更改,我会这样做,这会使这更容易。

我能够找到显示how to iterate through each element

的链接
        public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
    {
        if (depObj != null)
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                if (child != null && child is T)
                {
                    yield return (T)child;
                }

                foreach (T childOfChild in FindVisualChildren<T>(child))
                {
                    yield return childOfChild;
                }
            }
        }
    }

但是,这似乎只适用于模板本身的代码!所以这对我的班级没有帮助,我想要打印。当然,我可以创建一个全局范围的变量并以这种方式传递我的UIelements列表,但这种方式变得越来越不干净。最重要的是,我只能在模板类的Windows_Loaded事件中调用此方法。 Windows_Loaded仅在调用WindowInstance.ShowDialog();时被调用,这当然会在屏幕上显示模板,这也是我不能拥有的模板。

无论如何都要完成我正在尝试的东西,或者我更好地废弃整个模板的想法并通过后面的代码定位所有内容。

更新虽然这里的一些答案指出了我正确的方向,但我还是需要花一些时间去做我想做的事情。解决方案:

我在Lena的答案的帮助下拼凑了我的解决方案,我在下面接受并another post

要获得一个这样的例子,请使用Lena的View.xaml,View.xaml.cs,ViewModel.cs,然后使用我自己的方法打印View.xaml

    private void StackOverFlow()
        {
            string palletID = "00801004018000020631";
            PrintDialog pd = new PrintDialog();
            FixedDocument fixedDoc = new FixedDocument();
            PageContent pageContent = new PageContent();
            FixedPage fixedPage = new FixedPage();

            fixedDoc.DocumentPaginator.PageSize = new System.Windows.Size(pd.PrintableAreaWidth, pd.PrintableAreaHeight);
            fixedPage.Width = fixedDoc.DocumentPaginator.PageSize.Width;
            fixedPage.Height = fixedDoc.DocumentPaginator.PageSize.Height;

            fixedPage.Width = 4.0 * 96;
            fixedPage.Height = 3.0 * 96;
            var pageSize = new System.Windows.Size(4.0 * 96.0, 3.0 * 96.0);


            View v = new View();
            ViewModel vm = new ViewModel(); //This would be the label object with

            //set all ViewModel.cs Props here
vm.Text1 = "MyText1";
vm.Text2 = "MyText2";

            v.DataContext = vm;
            v.Height = pageSize.Height;
            v.Width = pageSize.Width;
            v.UpdateLayout();


            fixedPage.Children.Add(v);
            ((System.Windows.Markup.IAddChild)pageContent).AddChild(fixedPage);
            fixedDoc.Pages.Add(pageContent);

            //Use the XpsDocumentWriter to "Write" to a specific Printers Queue to Print the document
            XpsDocumentWriter dw1 = PrintQueue.CreateXpsDocumentWriter(new System.Printing.PrintQueue(new System.Printing.PrintServer(), "CutePDF Writer"));

            dw1.Write(fixedDoc);

        }

3 个答案:

答案 0 :(得分:3)

您可以使用您提到的文章的第一部分来实现此目的:WPF Printing Part 1

即使未显示窗口,PrintVisual方法似乎也能正常工作。

这是一个小例子:

只有一个按钮的主窗口:

MainWindow _barcodeWindow = new MainWindow("A1b2c3D4e5");

private void Button_Click(object sender, RoutedEventArgs e)
{
    _barcodeWindow.Print();
    _barcodeWindow.ShowDialog();
}

“模板”窗口:

<StackPanel Name="StuffToPrint">
    <Label>Some sample text</Label>
    <Label Name="BarCodeLabel" FontSize="40" Margin="96" FontFamily="Code 128"/>
    <Label>More sample text</Label>
</StackPanel>

及其背后的代码:

public MainWindow(string code)
{
    InitializeComponent();
    BarCodeLabel.Content = BarcodeConverter128.StringToBarcode(code);
}

public void Print()
{
    PrintDialog dlg = new PrintDialog();
    if (dlg.ShowDialog() == true)
    {
        dlg.PrintVisual(StuffToPrint, "Barcode");
    }
}

答案 1 :(得分:1)

如果我误解了你的需要,我很抱歉,但我希望我的例子可以帮助你一点点。 这是完整而简单的示例 - 只需创建这些文件并进行测试即可!

View.xaml

<DockPanel x:Class="WpfApplication1.View"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             Height="300" Width="400">
    <StackPanel Orientation="Vertical">
        <StackPanel Orientation="Horizontal">
            <TextBlock Margin="10" Text="Static Text"/>
            <Button Margin="10">Any control can be here</Button>
        </StackPanel>
        <StackPanel Orientation="Horizontal">
            <TextBlock Margin="10" Width="100"  Text="{Binding Text1}"/>
            <TextBox Width="100" Text="{Binding Text2}"/>
        </StackPanel>
    </StackPanel>
</DockPanel>

View.xaml.cs

using System.Windows.Controls;

namespace WpfApplication1
{
    public partial class View : DockPanel
    {
        public View()
        {
            InitializeComponent();
        }
    }
}

ViewModel.cs

namespace WpfApplication1
{
    public  class ViewModel
    {
        public string Text1 { get; set; }
        public string Text2 { get; set; }
    }
}

使用以下代码用数据填充ViewModel并将其打印到文件

var path = "newdoc.xps";
FixedDocument fixedDoc = new FixedDocument();
PageContent pageContent = new PageContent();
FixedPage fixedPage = new FixedPage();
fixedPage.Width = 11.69 * 96;
fixedPage.Height = 8.27 * 96;
var pageSize = new System.Windows.Size(11.0 * 96.0, 8.5 * 96.0);
View v = new View();
ViewModel vm = new ViewModel();
vm.Text1 = "MyText1";
vm.Text2 = "MyText2";
v.DataContext = vm;
v.UpdateLayout();
v.Height = pageSize.Height;
v.Width = pageSize.Width;
v.UpdateLayout();
fixedPage.Children.Add(v);
((System.Windows.Markup.IAddChild)pageContent).AddChild(fixedPage);
fixedDoc.Pages.Add(pageContent);
if (File.Exists(path))
    File.Delete(path);
XpsDocument xpsd = new XpsDocument(path, FileAccess.ReadWrite);
XpsDocumentWriter xw = XpsDocument.CreateXpsDocumentWriter(xpsd);
xw.Write(fixedDoc);
xpsd.Close();

答案 2 :(得分:1)

如何打印顶层UIElement而不是整个窗口?

例如,如果你有一个Window:

<Window x:Class="WpfApplicationGrid.Window_Template1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window_Template1" Height="300" Width="300">
    <Grid Name="MainGrid" >
        <!--some content....-->
    </Grid>
</Window>

//-------------------------
public Grid GetMyGrid()
{
   return MainGrid;
}

打印:

 Window_Template1 myWindow = new Window_Template1();
// clone the grid you want to print, so the exception you mentioned won't happen:
Grid clonedGrid = null;
string uiToSave = XamlWriter.Save(myWindow.GetMyGrid());
using (StringReader stringReader = new StringReader(uiToSave))
{
      using (XmlReader xmlReader = XmlReader.Create(stringReader))
      {
          clonedGrid = (Grid)XamlReader.Load(xmlReader);
      }
}

// for some reason you have to close the window even if there was no Show() called
// to properly dispose of it
// otherwise there may be some unpredictable behaviour (maybe I have something odd in my project settings...)
myWindow.Close();

PrintDialog pd = new PrintDialog();
FixedDocument document = new FixedDocument();
document.DocumentPaginator.PageSize = new System.Windows.Size(pd.PrintableAreaWidth, pd.PrintableAreaHeight);

// remember to set sizes again, if they're not set in xaml, for example:
clonedGrid.Height = document.DocumentPaginator.PageSize.Height;
clonedGrid.Width = document.DocumentPaginator.PageSize.Width;
clonedGrid.UpdateLayout();

FixedPage page1 = new FixedPage();
page1.Width = document.DocumentPaginator.PageSize.Width;
page1.Height = document.DocumentPaginator.PageSize.Height;

// this will add the content of the whole grid to the page without problem
page1.Children.Add(clonedGrid);

PageContent page1Content = new PageContent();
((IAddChild)page1Content).AddChild(page1);
document.Pages.Add(page1Content);

// then print...