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XmlWriter throws on invalid surrogate pairs

Scope

Edge

Version Introduced

4.6

Source Analyzer Status

Planned

Change Description

For apps that target the .NET Framework 4.5.2 or previous versions, writing an invalid surrogate pair using exception fallback handling does not always throw an exception. For apps that target the .NET Framework 4.6, attempting to write an invalid surrogate pair throws an xref:System.ArgumentException?displayProperty=name.

  • Quirked
  • Build-time break

Recommended Action

If necessary, this break can be avoided by targeting the .NET Framework 4.5.2 or earlier. Alternatively, invalid surrogate pairs can be pre-processed into valid xml prior to writing them.

Affected APIs

  • M:System.Xml.XmlWriter.WriteAttributeString(System.String,System.String)
  • M:System.Xml.XmlWriter.WriteAttributeString(System.String,System.String,System.String)
  • M:System.Xml.XmlWriter.WriteAttributeString(System.String,System.String,System.String,System.String)
  • M:System.Xml.XmlWriter.WriteAttributeStringAsync(System.String,System.String,System.String,System.String)
  • M:System.Xml.XmlWriter.WriteCData(System.String)
  • M:System.Xml.XmlWriter.WriteCDataAsync(System.String)
  • M:System.Xml.XmlWriter.WriteChars(System.Char[],System.Int32,System.Int32)
  • M:System.Xml.XmlWriter.WriteCharsAsync(System.Char[],System.Int32,System.Int32)
  • M:System.Xml.XmlWriter.WriteComment(System.String)
  • M:System.Xml.XmlWriter.WriteCommentAsync(System.String)
  • M:System.Xml.XmlWriter.WriteEntityRef(System.String)
  • M:System.Xml.XmlWriter.WriteEntityRefAsync(System.String)
  • M:System.Xml.XmlWriter.WriteRaw(System.Char[],System.Int32,System.Int32)
  • M:System.Xml.XmlWriter.WriteProcessingInstruction(System.String,System.String)
  • M:System.Xml.XmlWriter.WriteProcessingInstructionAsync(System.String,System.String)
  • M:System.Xml.XmlWriter.WriteRaw(System.String)
  • M:System.Xml.XmlWriter.WriteRawAsync(System.Char[],System.Int32,System.Int32)
  • M:System.Xml.XmlWriter.WriteRawAsync(System.String)
  • M:System.Xml.XmlWriter.WriteString(System.String)
  • M:System.Xml.XmlWriter.WriteStringAsync(System.String)
  • M:System.Xml.XmlWriter.WriteSurrogateCharEntity(System.Char,System.Char)
  • M:System.Xml.XmlWriter.WriteSurrogateCharEntityAsync(System.Char,System.Char)
  • M:System.Xml.XmlWriter.WriteValue(System.String)

Category

XML, XSLT