58 lines
2.8 KiB
Markdown
58 lines
2.8 KiB
Markdown
## XmlWriter throws on invalid surrogate pairs
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### Scope
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Edge
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### Version Introduced
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4.6
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### Source Analyzer Status
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Planned
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### Change Description
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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 `ArgumentException`.
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- [x] Quirked
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- [ ] Build-time break
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### Recommended Action
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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.
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### Affected APIs
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* `M:System.Xml.XmlWriter.WriteAttributeString(System.String,System.String)`
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* `M:System.Xml.XmlWriter.WriteAttributeString(System.String,System.String,System.String)`
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* `M:System.Xml.XmlWriter.WriteAttributeString(System.String,System.String,System.String,System.String)`
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* `M:System.Xml.XmlWriter.WriteAttributeStringAsync(System.String,System.String,System.String,System.String)`
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* `M:System.Xml.XmlWriter.WriteCData(System.String)`
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* `M:System.Xml.XmlWriter.WriteCDataAsync(System.String)`
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* `M:System.Xml.XmlWriter.WriteChars(System.Char[],System.Int32,System.Int32)`
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* `M:System.Xml.XmlWriter.WriteCharsAsync(System.Char[],System.Int32,System.Int32)`
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* `M:System.Xml.XmlWriter.WriteComment(System.String)`
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* `M:System.Xml.XmlWriter.WriteCommentAsync(System.String)`
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* `M:System.Xml.XmlWriter.WriteEntityRef(System.String)`
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* `M:System.Xml.XmlWriter.WriteEntityRefAsync(System.String)`
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* `M:System.Xml.XmlWriter.WriteRaw(System.Char[],System.Int32,System.Int32)`
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* `M:System.Xml.XmlWriter.WriteProcessingInstruction(System.String,System.String)`
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* `M:System.Xml.XmlWriter.WriteProcessingInstructionAsync(System.String,System.String)`
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* `M:System.Xml.XmlWriter.WriteRaw(System.String)`
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* `M:System.Xml.XmlWriter.WriteRawAsync(System.Char[],System.Int32,System.Int32)`
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* `M:System.Xml.XmlWriter.WriteRawAsync(System.String)`
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* `M:System.Xml.XmlWriter.WriteString(System.String)`
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* `M:System.Xml.XmlWriter.WriteStringAsync(System.String)`
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* `M:System.Xml.XmlWriter.WriteSurrogateCharEntity(System.Char,System.Char)`
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* `M:System.Xml.XmlWriter.WriteSurrogateCharEntityAsync(System.Char,System.Char)`
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* `M:System.Xml.XmlWriter.WriteValue(System.String)`
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### Category
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XML, XSLT
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[More information](https://msdn.microsoft.com/en-us/library/dn833123\(v=vs.110\).aspx)
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<!--
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### Notes
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Analyzer wouldn't add much over ApiPort, but we could do basic parameter analysis
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Single-diagnostic compilation action analyzer?? Depends on how likely it is we think we could usefully analyze arguments to these methods (and whether they contained invalid surrogate pairs)
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-->
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<!-- breaking change id: 81 -->
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