Char implements the methods ToLowerInvariant and ToUpperInvariant to transform a character to upper/lower case independent of the current culture. However, there are no IsUpperInvariant and IsLowerInvariant methods. Why?
Why are there no char.IsUpperInvariant / char.IsLowerInvariant methods?
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The following methods are the best you can get:
Once a character is converted to lower/upper format, whether the conversion was culture specific or not, they will properly detect its case.
On the other hand, you cannot say if a given character is the product of a culture specific or an invariant transformation. You can just look at it and observe that its current case is either lower or upper. Given, for example, the character
Eobtained from an upper case transformation... how can you say if it originally wasëore? If you don't know it's original form and the current culture the system is using... you simply can't.