C# 集合总是强制执行顺序吗？
IE 如果我想从数组中进行选择，生成的 IEnumerable
public class Student { public string FullName, ... }
public class School { public string Name, public Student[] Students, ... }
public void StudentListWork(School thisSchool)
{
IEnumerable<string> StudentNames = thisSchool.Students.Select(student => student.FullName);
// IS StudentNames GUARANTEED TO BE IN THE SAME ORDER AS thisSchool.Students?
}
谢谢！
I.E. If I want to select from an array, is the resultant IEnumerable<object> object necessarily in order?
public class Student { public string FullName, ... }
public class School { public string Name, public Student[] Students, ... }
public void StudentListWork(School thisSchool)
{
IEnumerable<string> StudentNames = thisSchool.Students.Select(student => student.FullName);
// IS StudentNames GUARANTEED TO BE IN THE SAME ORDER AS thisSchool.Students?
}
Thanks!
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是的，在这种情况下：
Enumerable.Select按原始序列的顺序返回项目（当然是在投影之后），但是有些集合不保留顺序。特别是：
HashSet和Dictionary等集合不保证返回值的SortedDictionary根据放置在其中的项目应用保证排序Yes, in this case:
Enumerable.Selectreturns items in the order of the original sequence (after projection, of course)Some collections do not retain order, however. In particular:
HashSet<T>andDictionary<TKey, TValue>make no guarantees about the order in which values are returnedSortedSet<T>andSortedDictionary<TKey, TValue>apply guaranteed ordering based on the items placed within them