重载了一个方法: public class RepeatDictionaryComparer : IEqualityComparer<string> { public bool Equals(string x, string y) { return x != y; } public int GetHashCode(string obj) { return obj.GetHashCode(); } } 调用: Dictionary<string, string> _dic = new
ä和a插入到唯一键时总提示重复 总提示:Duplicate entry 'a' for key 'name' 后来发现我用的COLLATE是utf8_general_ci,改为utf8_bin即可,命令如下: ALTER TABLE table CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin; 注意加上“ CONVERT TO ” 看样做国际化站点最好用区分大小的编码 参考问答:http://stackoverflow.com/questions/6
1. unordered_map 和 unordered_set template < class Key, // unordered_map::key_type class T, // unordered_map::mapped_type class Hash = hash<Key>, // unordered_map::hasher class Pred = equal_to<Key>, // unordered_map::key_equal class Alloc =