由 LineBreak 引起的 TextBlock 内联附加行为问题 [英] TextBlock Inlines Attached Behavior Issue by LineBreak

问题描述

有没有办法检查 Run 是否只是 LineBreak?

Hi is there a way to check if a Run is just a LineBreak?

建议您在 RichTextBox 中创建一些带有一些 LineBreaks 的文本，现在让我们进一步建议您想将文本保存在数据库中后，您可能会将 FlowDocument 转换为 XML 我现在是怎么做的，我想在 TextBlock 中显示这个XML 字符串"，所以我将它转换回 FlowDocument 编写 GetAllLine 扩展并使用附加行为绑定到TextBlock.Inlines 在这里结束我的 LineBreak 问题发生 <Run xml:lang='de-de' xml:space='preserve'/> 不会导致一个 LineBreak.

suggesting you create some Text with some LineBreaks in a RichTextBox now let's further suggest after you want to save your text in a DataBase you will probably convert the FlowDocument as XML how i did now i want to show this "XML-string" in a TextBlock so i convert it back as FlowDocument write an GetAllLine extension and used a Attached Behavior to bind to TextBlock.Inlines end here my LineBreak Issue occurs <Run xml:lang='de-de' xml:space='preserve' /> doesn't result in a LineBreak.

<Window x:Class="TextBlockAttachedIssue.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:TextBlockAttachedIssue"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TextBlock local:Bindable.Inlines="{Binding myInlines}" TextWrapping="WrapWithOverflow"/>
    </Grid>
</Window>

代码隐藏

namespace TextBlockAttachedIssue
{
    /// <summary>
    /// Interaktionslogik für MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            DataContext = new VM();
        }
    }

    public class VM
    {
        private IEnumerable<Inline> _myInlines;

        public VM()
        {
            var myParagraph =
                "<Paragraph xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'> " +
                "<Run xml:lang='de-de' xml:space='preserve' />" +
                "<Run xml:lang='de-de' xml:space='preserve' />" +
                    " das ist text davor" +
                    "<Run FontFamily='Palatino Linotype'> " +
                        "line2  dsf adsgf sd fds gs fd gsfd g sdfg df h g hdgf h fg hhgfdh gfh " +
                    "</Run> " +
                "<Run xml:lang='de-de' xml:space='preserve' />" +
                    "und das ist text danach" +
                "</Paragraph> ";
            var para = XamlReader.Load(XmlReader.Create(new StringReader(myParagraph))) as Paragraph;
            myInlines = para.Inlines.ToList();
        }

        public IEnumerable<Inline> myInlines
        {
            get { return _myInlines; }
            private set { _myInlines = value; }
        }
    }
}

附加行为

using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;

namespace TextBlockAttachedIssue
{
    public static class Bindable
    {
        public static readonly DependencyProperty InlinesProperty = DependencyProperty.RegisterAttached("Inlines", typeof(IEnumerable<Inline>), typeof(Bindable), new PropertyMetadata(OnInlinesChanged));

        private static void OnInlinesChanged(DependencyObject source, DependencyPropertyChangedEventArgs e)
        {
            var textBlock = source as TextBlock;

            if (textBlock != null)
            {
                textBlock.Inlines.Clear();
                var inlines = e.NewValue as IEnumerable<Inline>;
                if (inlines != null)
                    textBlock.Inlines.AddRange(inlines);
            }
        }

        [AttachedPropertyBrowsableForType(typeof(TextBlock))]
        public static IEnumerable<Inline> GetInlines(this TextBlock textBlock)
        {
            return (IEnumerable<Inline>)textBlock.GetValue(InlinesProperty);
        }

        public static void SetInlines(this TextBlock textBlock, IEnumerable<Inline> inlines)
        {
            textBlock.SetValue(InlinesProperty, inlines);
        }
    }
}

推荐答案

我不相信 Run 曾经代表换行.为了表示换行符，不同种类的内联 使用 - LineBreak.

I do not believe that Run ever represents a line break. To represent a line break, different kind of Inline is used - LineBreak.

在 FlowDocumentReader:

<FlowDocumentReader>
    <FlowDocument>
        <Paragraph xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
            <Run xml:lang='de-de' xml:space='preserve' />
            <Run xml:lang='de-de' xml:space='preserve' /> das ist text davor
            <Run FontFamily='Palatino Linotype'> 
                line2  dsf adsgf sd fds gs fd gsfd g sdfg df h g hdgf h fg hhgfdh gfh 
            </Run> 
            <Run xml:lang='de-de' xml:space='preserve' />
            und das ist text danach
        </Paragraph>
    </FlowDocument>
</FlowDocumentReader>

段落，另一方面是一个 Block 元素，它打破了一个新的线.也许段落导致了您的问题.

Paragraph, on the other hand is a Block element which breaks to a new line. Perhaps Paragraph is causing your issue.

为什么不使用 FlowDocumentReader 显示 FlowDocument 文本，而不是 TextBlock?使用 FlowDocumentReader，您将完全支持 FlowDocument，包括段落和所有其他 TextElement-派生的项.

Why don't you use FlowDocumentReader to show FlowDocument text, instead of TextBlock? With FlowDocumentReader you would have full support for FlowDocument, including Paragraphs and all other TextElement-derived items.

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