第三个参数告诉Compare方法是否在进行比较时忽略字母的大小写。

This third parameter tells the Compare method whether it should ignore the letter case when making comparisons.

youdao

区分大小写：对单词的字母大小写进行搜索（默认是忽略字母大小）

Case sensitive : search is performed with respect to the letter-case of the words (default is to ignore letter-case)

youdao

区分大小写：对单词的字母大小写进行搜索（默认是忽略字母大小）

Case sensitive : search is performed with respect to the letter-case of the words (default is to ignore letter-case)

youdao