Class HtmlService

Provides HTML and SVG sanitization and manipulation services using HtmlSanitizer and regex patterns.

Inheritance

object

HtmlService

Implements

IHtmlService

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: DataWeb.Text.Html.AngleSharp

Assembly: DataWeb.Text.Html.AngleSharp.dll

Syntax

public class HtmlService : IHtmlService

Properties

Name

Gets the name that identifies this HTML service provider.

Declaration

public string Name { get; }

Property Value

Type	Description
string

Methods

ConvertToText(string)

Converts HTML to plain text by removing tags and styles, and converting line breaks to newlines.

Declaration

public string ConvertToText(string value)

Parameters

Type	Name	Description
string	value	The HTML string to convert. Returns unchanged if null or empty.

Returns

Type	Description
string	Plain text extracted from the HTML.

IsSafeSvg(string)

Checks if an SVG string contains potentially unsafe content such as scripts or event handlers.

Declaration

public bool IsSafeSvg(string value)

Parameters

Type	Name	Description
string	value	The SVG string to validate. Returns true if null or empty.

Returns

Type	Description
bool	true if the SVG is safe; false if it contains unsafe patterns.

IsSvg(string)

Determines whether a string is valid SVG markup by checking for SVG tags and parsing XML structure.

Declaration

public bool IsSvg(string value)

Parameters

Type	Name	Description
string	value	The string to validate as SVG. Returns false if null or empty.

Returns

Type	Description
bool	true if the string is valid SVG; false otherwise.

RemoveInvalidHtmlTags(string)

Removes or escapes invalid HTML tags while preserving safe elements like iframes, videos, and media tags.

Declaration

public string RemoveInvalidHtmlTags(string value)

Parameters

Type	Name	Description
string	value	The HTML string to sanitize. Returns unchanged if null or empty.

Returns

Type	Description
string	The sanitized HTML string.

ReplaceHtmlEntities(string)

Encodes special HTML characters to their entity equivalents and corrects malformed entities.

Declaration

public string ReplaceHtmlEntities(string value)

Parameters

Type	Name	Description
string	value	The string to encode. Returns unchanged if null or empty.

Returns

Type	Description
string	The HTML-encoded string with <, >, and & properly escaped.

SanitizeSvg(string)

Sanitizes SVG content by removing unsafe elements and attributes, preserving only safe SVG graphics tags.

Declaration

public string SanitizeSvg(string value)

Parameters

Type	Name	Description
string	value	The SVG string to sanitize. Returns unchanged if null or empty.

Returns

Type	Description
string	The sanitized SVG string.

StripHtml(string)

Removes all HTML tags from the input string, leaving only text content.

Declaration

public string StripHtml(string value)

Parameters

Type	Name	Description
string	value	The HTML string to process. Returns unchanged if null or empty.

Returns

Type	Description
string	The string with all HTML tags removed.

Implements

IHtmlService