c# – 关于字符串比较的奇怪之处

这段代码：

        Console.WriteLine("~".CompareTo("a") > 0);
        Console.WriteLine('~'.CompareTo('a') > 0);

给我：

False
True

WTF？

解决方法:

显示此行为的另一种方法是：

Console.WriteLine("a".CompareTo("b")); // -1 
Console.WriteLine("b".CompareTo("a")); // 1
Console.WriteLine('a'.CompareTo('b')); // -1 
Console.WriteLine('b'.CompareTo('a')); // 1

Console.WriteLine("~".CompareTo("a")); // -1
Console.WriteLine("a".CompareTo("~")); // 1
Console.WriteLine('~'.CompareTo('a')); // 29
Console.WriteLine('a'.CompareTo('~')); // -29

差异可能很微妙,但它是documented.Char.CompareTo(Char)中的比较是

based on
the encoded values of this instance
and value, not their lexicographical
characteristics.

同时,documentation for String.CompareTo(String)

performs a word (case-sensitive and
culture-sensitive) comparison using
the current culture.

即第一个基于订单的比较,后者基于当前文化中的默认规则(您可能在字典中看到的顺序).

标签：c,net,net-3-5,net-4-0
来源： https://codeday.me/bug/20190713/1451937.html