c#list<int> 如何在两个值之间插入一个新值
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c# list<int> how to insert a new value in between two values
提问by gdubs
so i have a list where i need to add new values constantly but when i do i need to increment it and insert it in between two values.
所以我有一个列表，我需要在其中不断添加新值，但是当我这样做时，我需要增加它并将其插入两个值之间。
List<int> initializers = new List <int>();
initializers.Add(1);
initializers.Add(3);
so initializers would have 1, 3 values.
所以初始值设定项将有 1, 3 个值。
i would then process a new set of numbers. the initializers will need to have the values.
然后我会处理一组新的数字。初始值设定项将需要具有值。
1, 5, 3, 7
1, 5, 3, 7
and if i process another set of numbers it should become
如果我处理另一组数字，它应该变成
1, 9, 5, 13, 3, 11, 7, 15
1, 9, 5, 13, 3, 11, 7, 15
i know how to properly generate the new values inserted, i just need some help on inserting it in between the existing values of the initializers without having to add 2 or 3 more loops to move the values' positions.
我知道如何正确生成插入的新值，我只需要一些帮助就可以将它插入到初始值设定项的现有值之间，而不必再添加 2 或 3 个循环来移动值的位置。
采纳答案by Phil
List<int> initializers = new List <int>();
initializers.Add(1);
initializers.Add(3);
int index = initializers.IndexOf(3);
initializers.Insert(index, 2);
Gives you 1,2,3.
给你 1,2,3。
回答by Grant Thomas
回答by Lam Tran Duy
You can just use List.Insert()instead of List.Add() to insert items at a specific position.
您可以只使用List.Insert()而不是 List.Add() 在特定位置插入项目。
回答by Elideb
Another approach, if there is a computationally viable way of sorting the elements, is:
另一种方法，如果有一种计算上可行的元素排序方法，是：
list.Insert(num);
// ...
list.Insert(otherNum);
// Sorting function. Let's sort by absolute value
list.Sort((x, y) => return Math.Abs(x) - Math.Abs(y));
回答by Mehdi Dehghani
For those who are looking for something more complex (inserting more than one item between 2 values, or don't know how to find the indexof an item in a list), here is the answer:
对于那些正在寻找更复杂的东西（在 2 个值之间插入多个项目，或者不知道如何index在列表中找到项目的）的人，这里是答案：
Insert one item between 2 values is dead easy, as already mentioned by others:
正如其他人已经提到的那样，在 2 个值之间插入一项非常容易：
myList.Insert(index, newItem);
Insert more than one item also is easy, thanks to InsertRangemethod:
插入多个项目也很容易，感谢InsertRange方法：
myList.InsertRange(index, newItems);
And finally using following code you can find the index of an item in list:
最后使用以下代码，您可以在列表中找到项目的索引：
var index = myList.FindIndex(x => x.Whatever == whatever); // e.g x.Id == id
