基本上,我有一个RichTextBox,我想把它的格式化内容转换成HTML,这样它就可以作为电子邮件发送。
我目前使用的方法根本不提供任何格式:
string message = new TextRange(messageTextBox.Document.ContentStart,
messageTextBox.Document.ContentEnd).Text;所以我搜索了一下,发现这已经有5年多的历史了,在评论中,一位微软用户评论说它不再受支持-- "This sample has been removed from our sample set and is no longer supported",它生成的HTML格式比现代的HTML或XHTML更好。
有人能告诉我如何将格式的RichTextBox内容转换为RichTextBox吗?
(因此,当电子邮件发送时,收件人会看到带有格式的电子邮件)
发布于 2011-06-04 17:46:06
一般技术是使用XamlWriter将FlowDocument内容转换为XML流,然后使用XSLT转换将XML转换为HTML。这不是一个很好的答案,但这是因为对于任何给定的FlowDocument,都有大量可能的HTML表示。
例如,这种转换将每个顶级Section转换为div,将每个Paragraph转换为p,将每个Run转换为span,后者的类告诉您它是否为斜体、粗体或下划线,或上述任何组合。它对于我编写它的目的是有用的,但是把它称为有损转换是一种低估:
<?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>下面是我编写的一个值转换器--注意,为了使用值转换器,您还必须破解并实现一个RichTextBox版本,该版本将内容公开为依赖项属性。真的,整个项目都很痛苦。
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
}发布于 2020-02-28 17:17:54
我认为以上XSLT工作表的扩展版本可能会有所帮助。不完美,但稍微全面一些。引用此答案的另一个答案的扩展。
<?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[not(parent::x:Section)]">
<xsl:variable name="style">
<xsl:if test="@FontStyle='Italic'">
<xsl:text>font-style:italic;</xsl:text>
</xsl:if>
<xsl:if test="@FontWeight='Bold'">
<xsl:text>font-weight:bold;</xsl:text>
</xsl:if>
<xsl:if test="contains(@TextDecorations, 'Underline')">
<xsl:text>text-decoration:underline;</xsl:text>
</xsl:if>
<xsl:if test="@FontSize != ''">
<xsl:text>font-size:</xsl:text>
<xsl:value-of select="@FontSize" />
<xsl:text>pt;</xsl:text>
</xsl:if>
<xsl:if test="@FontFamily != ''">
<xsl:text>font-family:</xsl:text>
<xsl:value-of select="@FontFamily" />
<xsl:text>;</xsl:text>
</xsl:if>
<xsl:if test="@Foreground != ''">
<xsl:text>color:</xsl:text>
<xsl:value-of select="concat(substring(@Foreground, 1, 1), substring(@Foreground, 4))" />
<xsl:text>;</xsl:text>
</xsl:if>
<xsl:if test="@Foreground-Color != ''">
<xsl:text>color:</xsl:text>
<xsl:value-of select="@Foreground-Color"/>
<xsl:text>;</xsl:text>
</xsl:if>
</xsl:variable>
<div>
<xsl:if test="normalize-space($style) != ''">
<xsl:attribute name="style">
<xsl:value-of select="normalize-space($style)"/>
</xsl:attribute>
</xsl:if>
<xsl:value-of select="text()"/>
<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">
<xsl:variable name="style">
<xsl:if test="@FontStyle='Italic'">
<xsl:text>font-style:italic;</xsl:text>
</xsl:if>
<xsl:if test="@FontWeight='Bold'">
<xsl:text>font-weight:bold;</xsl:text>
</xsl:if>
<xsl:if test="contains(@TextDecorations, 'Underline')">
<xsl:text>text-decoration:underline;</xsl:text>
</xsl:if>
<xsl:if test="@FontSize != ''">
<xsl:text>font-size:</xsl:text>
<xsl:value-of select="@FontSize" />
<xsl:text>pt;</xsl:text>
</xsl:if>
<xsl:if test="@FontFamily != ''">
<xsl:text>font-family:</xsl:text>
<xsl:value-of select="@FontFamily" />
<xsl:text>;</xsl:text>
</xsl:if>
<xsl:if test="@Foreground != ''">
<xsl:text>color:</xsl:text>
<xsl:value-of select="concat(substring(@Foreground, 1, 1), substring(@Foreground, 4))" />
<xsl:text>;</xsl:text>
</xsl:if>
<xsl:if test="@Foreground-Color != ''">
<xsl:text>color:</xsl:text>
<xsl:value-of select="@Foreground-Color"/>
<xsl:text>;</xsl:text>
</xsl:if>
</xsl:variable>
<p>
<xsl:if test="normalize-space($style) != ''">
<xsl:attribute name="style">
<xsl:value-of select="normalize-space($style)"/>
</xsl:attribute>
</xsl:if>
<xsl:value-of select="text()"/>
<xsl:apply-templates select="node()"/>
</p>
</xsl:template>
<xsl:template match="x:Span">
<xsl:variable name="style">
<xsl:if test="@FontStyle='Italic'">
<xsl:text>font-style:italic;</xsl:text>
</xsl:if>
<xsl:if test="@FontWeight='Bold'">
<xsl:text>font-weight:bold;</xsl:text>
</xsl:if>
<xsl:if test="contains(@TextDecorations, 'Underline')">
<xsl:text>text-decoration:underline;</xsl:text>
</xsl:if>
<xsl:if test="@FontSize != ''">
<xsl:text>font-size:</xsl:text>
<xsl:value-of select="@FontSize" />
<xsl:text>pt;</xsl:text>
</xsl:if>
<xsl:if test="@FontFamily != ''">
<xsl:text>font-family:</xsl:text>
<xsl:value-of select="@FontFamily" />
<xsl:text>;</xsl:text>
</xsl:if>
<xsl:if test="@Foreground != ''">
<xsl:text>color:</xsl:text>
<xsl:value-of select="concat(substring(@Foreground, 1, 1), substring(@Foreground, 4))" />
<xsl:text>;</xsl:text>
</xsl:if>
<xsl:if test="@Foreground-Color != ''">
<xsl:text>color:</xsl:text>
<xsl:value-of select="@Foreground-Color"/>
<xsl:text>;</xsl:text>
</xsl:if>
</xsl:variable>
<span>
<xsl:if test="normalize-space($style) != ''">
<xsl:attribute name="style">
<xsl:value-of select="normalize-space($style)"/>
</xsl:attribute>
</xsl:if>
<xsl:value-of select="text()"/>
<xsl:apply-templates select="node()"/>
</span>
</xsl:template>
<xsl:template match="x:Run">
<xsl:variable name="style">
<xsl:if test="@FontStyle='Italic'">
<xsl:text>font-style:italic;</xsl:text>
</xsl:if>
<xsl:if test="@FontWeight='Bold'">
<xsl:text>font-weight:bold;</xsl:text>
</xsl:if>
<xsl:if test="contains(@TextDecorations, 'Underline')">
<xsl:text>text-decoration:underline;</xsl:text>
</xsl:if>
<xsl:if test="@FontSize != ''">
<xsl:text>font-size:</xsl:text>
<xsl:value-of select="@FontSize" />
<xsl:text>pt;</xsl:text>
</xsl:if>
<xsl:if test="@FontFamily != ''">
<xsl:text>font-family:</xsl:text>
<xsl:value-of select="@FontFamily" />
<xsl:text>;</xsl:text>
</xsl:if>
<xsl:if test="@Foreground != ''">
<xsl:text>color:</xsl:text>
<xsl:value-of select="concat(substring(@Foreground, 1, 1), substring(@Foreground, 4))" />
<xsl:text>;</xsl:text>
</xsl:if>
<xsl:if test="@Foreground-Color != ''">
<xsl:text>color:</xsl:text>
<xsl:value-of select="@Foreground-Color"/>
<xsl:text>;</xsl:text>
</xsl:if>
</xsl:variable>
<span>
<xsl:if test="normalize-space($style) != ''">
<xsl:attribute name="style">
<xsl:value-of select="normalize-space($style)"/>
</xsl:attribute>
</xsl:if>
<xsl:value-of select="text()"/>
<xsl:apply-templates select="node()"/>
</span>
</xsl:template>
</xsl:stylesheet>发布于 2021-04-21 06:20:46
对于那些正在为.Net核心(APS.Net核心)寻找解决方案的人来说,nuget MarkupConverter为我做了一个窍门。添加依赖关系引用
<PackageReference Include="MarkupConverter" Version="1.0.6" />那就用它
MarkupConverter.MarkupConverter markupConverter = new MarkupConverter.MarkupConverter();
try
{
message = markupConverter.ConvertXamlToHtml(message);
}
catch (Exception ex)
{
_logger.LogError(ex, $"Failed to parse flowdocument");
}https://stackoverflow.com/questions/6236483
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