Unicode versions in .NET

Question

The documentation of CharUnicodeInfo.GetUnicodeCategory says:

Note that CharUnicodeInfo.GetUnicodeCategory does not always return the same UnicodeCategory value as the Char.GetUnicodeCategory method when passed a particular character as a parameter.

The CharUnicodeInfo.GetUnicodeCategory method is designed to reflect the current version of the Unicode standard. In contrast, although the Char.GetUnicodeCategory method usually reflects the current version of the Unicode standard, it might return a character's category based on a previous version of the standard, or it might return a category that differs from the current standard to preserve backward compatibility.

So, which version of the Unicode standard is reflected by CharUnicodeInfo.GetUnicodeCategory and Char.GetUnicodeCategory in which version of the .NET Framework?

Answer 1

The documentation for the String Class states the Unicode version that the .NET Framework 4 and 4.5 conform to:

.NET Framework 4

In the .NET Framework 4, sorting, casing, normalization, and Unicode character information is synchronized with Windows 7 and conforms to the Unicode 5.1 standard.

.NET Framework 4.5

In the .NET Framework 4.5 running on the Windows 8 operating system, sorting, casing, normalization, and Unicode character information conforms to the Unicode 6.0 standard. On other operating systems, it conforms to the Unicode 5.0 standard.