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contentdisposition-datetimes-returns-slightly-different-string.md

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ContentDisposition DateTimes returns slightly different string

Scope

Minor

Version Introduced

4.6

Source Analyzer Status

Available

Change Description

String representations of xref:System.Net.Mime.ContentDisposition?displayProperty=name's have been updated, beginning in 4.6, to always represent the hour component of a xref:System.DateTime?displayProperty=name with two digits. This is to comply with RFC822 and RFC2822. This causes xref:System.Net.Mime.ContentDisposition.ToString to return a slightly different string in 4.6 in scenarios where one of the disposition's time elements was before 10:00 AM. Note that ContentDispositions are sometimes serialized via converting them to strings, so any xref:System.Net.Mime.ContentDisposition.ToString operations, serialization, or GetHashCode calls should be reviewed.

  • Quirked
  • Build-time break

Recommended Action

Do not expect that string representations of ContentDispositions from different .NET Framework versions will correctly compare to one another. Convert the strings back to ContentDispositions, if possible, before conducting a comparison.

Affected APIs

  • M:System.Net.Mime.ContentDisposition.ToString
  • M:System.Net.Mime.ContentDisposition.GetHashCode

Category

Networking