删除所有你不想要的字符，然后使用TOLOWER（）方法来忽略大小写。

Remove all the characters you don't want and then use the ToLower() method to ignore case.

编辑：虽然上述作品，***使用 StringComparison.OrdinalIgnoreCase 。只是把它作为第二个参数等于方法。

edit: While the above works, it's better to use StringComparison.OrdinalIgnoreCase. Just pass it as the second argument to the Equals method.