C＃的FlowDocument到HTML的转换 [英] C# FlowDocument to HTML conversion
问题描述
基本上，我有一个RichTextBox，我想它的格式化内容转换为HTML，因此它可以作为电子邮件发送。
Basically, I have a RichTextBox and I want to convert the formatted contents of it to HTML so it can be sent as an email.
我目前的方法使用不给所有的任何格式：
The method I am currently using does not give any formatting at all:
string message = new TextRange(messageTextBox.Document.ContentStart,
messageTextBox.Document.ContentEnd).Text;
所以，我搜索了一圈，发现的这个，但是，它是5岁以上，并在注释的MSFT用户评论说，它不再支持 - 此示例已经从我们的样本组中删除，并不再支持，以及它生成的HTML是比现代的HTML或XHTML这将是最好有一个较旧的格式。
So I searched around and found this, however, it is over 5 years old and in the comments an MSFT user has commented saying that it is no longer supported - "This sample has been removed from our sample set and is no longer supported", and the HTML it generates is in an older format than modern HTML or XHTML which would be better to have.
有人能告诉我我怎么可以转换在格式一个RichTextBox的内容对HTML？
Can anybody show me how I can convert the formatted contents of a RichTextBox to HTML?
（所以当发送电子邮件它的收件人看到的电子邮件格式）
(So when the email is sent it the recipient sees the email with formatting)
推荐答案
一般的方法是使用的XamlWriter 到的FlowDocument 内容转换为XML流，然后使用XSLT转换来转换XML为HTML。这不是太多的答案，但是这是因为有一个巨大的任何给定的FlowDocument可能的HTML表示范围。
The general technique is to use a XamlWriter to convert the FlowDocument content to a stream of XML, and then to use an XSLT transform to convert the XML to HTML. That's not much of an answer, but that's because there's a huge range of possible HTML representations of any given FlowDocument.
这变换，例如，每个顶级转换部分到 DIV ，每个段落到 p ，每运行到跨度，它的类会告诉你是否没有它的楷体，黑体，或加下划线或上述的任意组合。这是我写它的目的是有用的，但是把它称为有损转型是轻描淡写：
This transform, for instance, converts every top-level Section to a div, every Paragraph to a p, and every Run to a span whose class tells you whether or not it's italicized, bold-faced, or underlined, or any combination of the above. It was useful for the purpose I wrote it for, but to call it a lossy transformation is an understatement:
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:msxsl="urn:schemas-microsoft-com:xslt"
exclude-result-prefixes="msxsl x">
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/>
<xsl:template match="x:Section[not(parent::x:Section)]">
<div>
<xsl:apply-templates select="node()"/>
</div>
</xsl:template>
<xsl:template match="x:Section">
<xsl:apply-templates select="node()"/>
</xsl:template>
<xsl:template match="x:Paragraph">
<p>
<xsl:apply-templates select="node()"/>
</p>
</xsl:template>
<xsl:template match="x:Run">
<xsl:variable name="class">
<xsl:if test="@FontStyle='Italic'">
<xsl:text>i </xsl:text>
</xsl:if>
<xsl:if test="@FontWeight='Bold'">
<xsl:text>b </xsl:text>
</xsl:if>
<xsl:if test="contains(@TextDecorations, 'Underline')">
<xsl:text>u </xsl:text>
</xsl:if>
</xsl:variable>
<span>
<xsl:if test="normalize-space($class) != ''">
<xsl:attribute name="class">
<xsl:value-of select="normalize-space($class)"/>
</xsl:attribute>
</xsl:if>
<xsl:value-of select="text()"/>
</span>
</xsl:template>
</xsl:stylesheet>
下面是一个值转换器，我写做转换 - 注意，为了使用的值转换器，你还必须破解四周，实现版本的RichTextBox 的一个公开的内容作为一个依赖属性。真的这整个项目是一个痛苦
Here's a value converter I wrote to do the conversion - note that in order to use the value converter, you also have to hack around and implement a version of RichTextBox that exposes the content as a dependency property. Really this whole project was a pain.
public class FlowDocumentToHtmlConverter : IValueConverter
{
private static XslCompiledTransform ToHtmlTransform;
private static XslCompiledTransform ToXamlTransform;
public FlowDocumentToHtmlConverter()
{
if (ToHtmlTransform == null)
{
ToHtmlTransform = LoadTransformResource("Converters/FlowDocumentToXhtml.xslt");
}
if (ToXamlTransform == null)
{
ToXamlTransform = LoadTransformResource("Converters/XhtmlToFlowDocument.xslt");
}
}
private static XslCompiledTransform LoadTransformResource(string path)
{
Uri uri = new Uri(path, UriKind.Relative);
XmlReader xr = XmlReader.Create(Application.GetResourceStream(uri).Stream);
XslCompiledTransform xslt = new XslCompiledTransform();
xslt.Load(xr);
return xslt;
}
#region IValueConverter Members
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (!(value is FlowDocument))
{
return null;
}
if (targetType == typeof(FlowDocument))
{
return value;
}
if (targetType != typeof(string))
{
throw new InvalidOperationException(
"FlowDocumentToHtmlConverter can only convert back from a FlowDocument to a string.");
}
FlowDocument d = (FlowDocument)value;
using (MemoryStream ms = new MemoryStream())
{
// write XAML out to a MemoryStream
TextRange tr = new TextRange(
d.ContentStart,
d.ContentEnd);
tr.Save(ms, DataFormats.Xaml);
ms.Seek(0, SeekOrigin.Begin);
// transform the contents of the MemoryStream to HTML
StringBuilder sb = new StringBuilder();
using (StringWriter sw = new StringWriter(sb))
{
XmlWriterSettings xws = new XmlWriterSettings();
xws.OmitXmlDeclaration = true;
XmlReader xr = XmlReader.Create(ms);
XmlWriter xw = XmlWriter.Create(sw, xws);
ToHtmlTransform.Transform(xr, xw);
}
return sb.ToString();
}
}
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value == null)
{
return new FlowDocument();
}
if (value is FlowDocument)
{
return value;
}
if (targetType != typeof(FlowDocument))
{
throw new InvalidOperationException(
"FlowDocumentToHtmlConverter can only convert to a FlowDocument.");
}
if (!(value is string))
{
throw new InvalidOperationException(
"FlowDocumentToHtmlConverter can only convert from a string or FlowDocument.");
}
string s = (string)value;
FlowDocument d;
using (MemoryStream ms = new MemoryStream())
using (StringReader sr = new StringReader(s))
{
XmlWriterSettings xws = new XmlWriterSettings();
xws.OmitXmlDeclaration = true;
using (XmlReader xr = XmlReader.Create(sr))
using (XmlWriter xw = XmlWriter.Create(ms, xws))
{
ToXamlTransform.Transform(xr, xw);
}
ms.Seek(0, SeekOrigin.Begin);
d = XamlReader.Load(ms) as FlowDocument;
}
XamlWriter.Save(d, Console.Out);
return d;
}
#endregion
}
这篇关于C＃的FlowDocument到HTML的转换的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
