将带有链接的文本绑定到 RichTextBox [英] Bind text with links to RichTextBox
本文介绍了将带有链接的文本绑定到 RichTextBox的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要将可能包含超链接的文本绑定到 RichTextBox,以便它可以将文本显示为普通文本,将链接显示为超链接.
I need to bind text which may contain hyperlinks to RichTextBox so it could show text as normal text and links as hyperlinks.
例如我有以下文字:
Join us on social networks
http://www.facebook.com/
我希望文本中的链接是超链接,因此 RichTextBox 中的结果将是这样的:
I want that links in a text be hyperlinks so the result in RichTextBox would be like this:
加入我们的社交网络
推荐答案
我实现了我需要的
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Text.RegularExpressions;
using System.Windows.Media;
namespace NazarGrynko.UI.Controls
{
public class MyRichTextBox : RichTextBox
{
private const string UrlPattern = @"(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?";
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof (string), typeof(MyRichTextBox ), new PropertyMetadata(default(string), TextPropertyChanged));
public string Text
{
get { return (string) GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
private static void TextPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var richTextBox = (MyRichTextBox)dependencyObject;
var text = (string) dependencyPropertyChangedEventArgs.NewValue;
int textPosition = 0;
var paragraph = new Paragraph();
var urlMatches = Regex.Matches(text, UrlPattern);
foreach (Match urlMatch in urlMatches)
{
int urlOccurrenceIndex = text.IndexOf(urlMatch.Value, textPosition, StringComparison.Ordinal);
if (urlOccurrenceIndex == 0)
{
var hyperlink = new Hyperlink
{
NavigateUri = new Uri(urlMatch.Value),
TargetName = "_blank",
Foreground = Application.Current.Resources["PhoneAccentBrush"] as Brush
};
hyperlink.Inlines.Add(urlMatch.Value);
paragraph.Inlines.Add(hyperlink);
textPosition += urlMatch.Value.Length;
}
else
{
paragraph.Inlines.Add(text.Substring(textPosition, urlOccurrenceIndex - textPosition));
textPosition += urlOccurrenceIndex - textPosition;
var hyperlink = new Hyperlink
{
NavigateUri = new Uri(urlMatch.Value),
TargetName = "_blank",
Foreground = Application.Current.Resources["PhoneAccentBrush"] as Brush
};
hyperlink.Inlines.Add(urlMatch.Value);
paragraph.Inlines.Add(hyperlink);
textPosition += urlMatch.Value.Length;
}
}
if (urlMatches.Count == 0)
{
paragraph.Inlines.Add(text);
}
richTextBox.Blocks.Add(paragraph);
}
}
}
使用示例:
<MyRichTextBox Text="{Binding Message}"/>
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