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XmlWriter.WriteSurrogateCharEntity Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

When overridden in a derived class, generates and writes the surrogate character entity for the surrogate character pair.

Namespace:  System.Xml
Assembly:  System.Xml (in System.Xml.dll)

Syntax

'Declaration
Public MustOverride Sub WriteSurrogateCharEntity ( _
    lowChar As Char, _
    highChar As Char _
)

public abstract void WriteSurrogateCharEntity(
    char lowChar,
    char highChar
)

Parameters

  • lowChar
    Type: System.Char
    The low surrogate. This must be a value between 0xDC00 and 0xDFFF.
  • highChar
    Type: System.Char
    The high surrogate. This must be a value between 0xD800 and 0xDBFF.

Exceptions

Exception Condition
ArgumentException

An invalid surrogate character pair was passed.

Remarks

This method is only applicable on systems that use UTF-16 encoding.

The surrogate character entity is written in hexadecimal format. The range for surrogate characters is #x10000 to #x10FFFF. The following formula is used to generate the surrogate character entity: (highChar -0xD800) * 0x400 + (lowChar -0xDC00) + 0x10000

For both HTML and XML, the document character set (and therefore the notation of numeric character references) is based on UCS [ISO-10646]. A single numeric character reference in a source document may therefore in some cases correspond to two 16-bit units in a string (a high surrogate and a low surrogate). These 16-bit units are referred to as a surrogate pair.

For more information regarding surrogates or characters, refer to section 3.7 of the Unicode 3.0/Unicode 2.0 standard located at http://www.unicode.org, or section 2.2 of the W3C XML 1.0 Recommendation located at http://www.w3.org/TR/REC-xml\#charsets.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.