没有toUpper / toLower的最有效的大写/小写字符串的方法

Question

在不使用toUpper / toLower的情况下，在.Net中大写/小写字符串的最佳方法是什么？

Answer 1

myString.ToLowerInvariant() 

and

myString.ToUpperInvariant()

Is what I'd use if ToLower and ToUpper is banned. Also check out The Turkey Test for why it's better to use the invariants.

or

You could create a function that will loop through the chars, adding to the ASCII values. If you can find out the difference between the lower case and upper case chars ASCII indexes.

Answer 2

I tried a few different things before I realized you had 'Most efficient' in your question :)

Anyway, this will work and (on my machine/with limited testing) it appears to perform the same as .ToLower().

Dim lower1 As String = StrConv(myStr, VbStrConv.Lowercase)

I ran it 100,000 times each way and the results were nearly identical