CozyRSS开发记录17-Html2Xaml
1、RssContentView还需要优化
上回做了RssContentView的显示,但是对于rss返回的描述(摘要),连换行的没有,更别说里面还有html描述符了。换行比较好解决,加个限定大小,再加一个自动换行的描述就可以了:
TextWrapping="Wrap" Margin="10 12 10 10"
2、在wpf里显示html的方法
显示html,有两个方向:
A、直接显示html
B、将html转换成别的内容再显示
先说直接显示html,又有几种比较可行方案:
A.1、使用wpf的WebBrowser控件
A.2、使用winform的WebBrowser空间
A.3、使用cef(CefSharp库)
这几种方法,有的可以直接加载html的内容,有的需要先构造一个临时的html文件。都能实现效果,而且对html支持得很好,但是也有一个缺点:网页控件和wpf的原生描绘的控件不能完美的融合成一体。
将html转换成别的内容再显示,也有几种比较可行的方案:
B.1、转成md再显示(Html2Markdown库)
B.2、直接转成xaml
最终,我选择的是Html2Xaml这个方案,毕竟xaml对文档布局的表达能力不比html弱。有一个比较好的可供参考的库,RichTextBlock.Html2Xaml,然而它是给WinRt用的。千辛万苦,我还是找到了一个能在wpf用的库:HtmlTextBlock。
3、使用HtmlTextBlock
从nuget添加HtmlTextBlock,然后参考HtmlTextBlockTest添加一个控件,就可以显示html了:
效果有问题,因为html里标记是尖括号的,而HtmlTextBlock解析的是中括号[b],,所以我们需要转换一下。另外, 也没有处理,我们把它转成空格。最后,相关的代码和效果如下:
感觉还是不够好,而HtmlTextBlock也是开源的,所以,以后也许会自己再造一个Html2Xaml的库吧。

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.

HTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.

ToinsertanimageintoanHTMLpage,usethetagwithsrcandaltattributes.1)UsealttextforaccessibilityandSEO.2)Implementsrcsetforresponsiveimages.3)Applylazyloadingwithloading="lazy"tooptimizeperformance.4)OptimizeimagesusingtoolslikeImageOptimtoreduc

The core purpose of HTML is to enable the browser to understand and display web content. 1. HTML defines the web page structure and content through tags, such as, to, etc. 2. HTML5 enhances multimedia support and introduces and tags. 3.HTML provides form elements to support user interaction. 4. Optimizing HTML code can improve web page performance, such as reducing HTTP requests and compressing HTML.

HTMLtagsareessentialforwebdevelopmentastheystructureandenhancewebpages.1)Theydefinelayout,semantics,andinteractivity.2)SemantictagsimproveaccessibilityandSEO.3)Properuseoftagscanoptimizeperformanceandensurecross-browsercompatibility.


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