C# 移动列表中的元素
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Move elements in list
提问by Jacek
I declare following object
我声明以下对象
List<string> list = {"Kate", "John", "Paul", "Eve", "Hugo"};
I would like to move "Eve" at front of my list? How can I do that. I must not to reorder other elements!
At output I want to get this
我想将“Eve”移到我的列表前面？我怎样才能做到这一点。我不能对其他元素重新排序！
在输出我想得到这个
"Eve", "Kate", "John", "Paul", "Hugo"
采纳答案by Cédric Bignon
list.Remove("Eve"); // Removes the first "Eve" element in the list
list.Insert(0, "Eve"); // Inserts "Eve" at the first position in the list
However, if your list contains multiple "Eve"s, calling Remove("Eve") will only remove the first occurrence of "Eve".
但是，如果您的列表包含多个“Eve”，则调用 Remove("Eve") 只会删除第一次出现的“Eve”。
And you have to know that inserting element at the beginning of a list is an expensive operation. Because all elements already in the list have to be shifted.
而且您必须知道在列表的开头插入元素是一项昂贵的操作。因为列表中已经存在的所有元素都必须移动。
UPDATE
更新
As @AlvinWong commented, LinkedList<string>is a very good solution to avoid this overhead when inserting an element. The Insertoperation is done in O(1) (O(n-i) in a List). The major drawback of LinkedList<string>is that accessing the ith element is an operation in O(i) (O(1) in a List).
正如@AlvinWong 评论的那样，这LinkedList<string>是一个很好的解决方案，可以在插入元素时避免这种开销。该Insert操作在 O(1) 中完成（O(ni) in a List）。的主要缺点LinkedList<string>是访问第ith 个元素是 O(i) 中的操作（a 中的 O(1) List）。
回答by Soner G?nül
You can remove and insert it to first index.
您可以将其删除并将其插入到第一个索引中。
List<string> list = new List<string>(){ "Kate", "John", "Paul", "Eve", "Hugo" };
list.Remove("Eve");
list.Insert(0, "Eve");
foreach (var i in list)
{
Console.WriteLine(i);
}
If you know your specific index of "Eve", you can remove it with List.RemoveAt()method.
如果您知道 的特定索引"Eve"，则可以使用List.RemoveAt()方法将其删除。
Here is a DEMO.
这是一个DEMO.
回答by Grant Thomas
You can use the List.RemoveAt(so you don't remove allEve's) and List.Insert.
您可以使用List.RemoveAt(因此您不会删除所有Eve) 和List.Insert.
回答by onkar
You can use RemoveAt method to remove Eve from the given index and use Insert to add the Eve at the start of the list.
您可以使用 RemoveAt 方法从给定的索引中删除 Eve，并使用 Insert 将 Eve 添加到列表的开头。
回答by Fredrick Gauss
list.Remove("Eve");
list.Insert(0, "Eve");
