C#在foreach循环中修改字典等集合出错:System.InvalidOperationException: Collection was modified; enumeration operation may not execute.这是因为在foreach中不允许修改集合,可通过如下方式修改dictPublish的值,如: Dictionary<string, string> _dict = new Dictionary<string, string>(dictPublis
The content of element type "web-app" must match "(icon?,display-name?,description?,distributable?,context-param*,filter*,filter-mapping*,listener*,servlet*,servlet-mapping*,session-config?,mime-mapping*,welcome-file-list?,error-page*,tagli
目录 一.链接报错 客户端连接mysql出错 链接客户端出错 交互登陆mysql出现warning警告Using a password 导入数据到数据库报错ERROR 1050 登陆数据库提示-bash: !@: event not found ACCess Denied for user(using password:YES) ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mys
遍历List集合删除元素的出现报错 遍历List集合删除元素的时候会发生索引越界异常或内容遍历不全等问题. 例子: List<String> al = new ArrayList<String>(); al.add("12"); al.add("1"); al.add("13"); int size = al.size(); 问题1:索引越界异常Exception in thread "main"
# result 是一个字典, 把里面属性值是None的属性删除 for key in result: if not result[key]: del result[key] continue 但是报错信息如下 RuntimeError: dictionary changed size during iteration # 字典在迭代的时候改变了字典大小 python 遍历一个dict.set类型的同时,并且在改变这个变量的长度或者一边遍历一边修改,这时候就会抛出这错误: 我查了一些资料之后,