SqlSugar C#代码中批量更新时报错：You cannot have no primary key and no conditions

问题：使用SqlSugar批量更新时报错“SqlSugar.SqlSugarException: You cannot have no primary key and no conditions”；
  主键或条件不存在

  Db.Updateable<User>(users).ExecuteCommand();

解决办法
  就是用WhereColumns指定条件，无主键更新

  Db.Updateable<User>(users).WhereColumns(it => new { it.Id }).ExecuteCommand();

作者：一纸年华