c# list how to insert a new value in between two values

Question

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.

List initiali         


        

Answer 1

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.

Answer 2

Use List<T>.Insert:

initializers.Insert(index, value);

Answer 3

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 index of an item in a list), here is the answer:

Insert one item between 2 values is dead easy, as already mentioned by others:

myList.Insert(index, newItem);

Insert more than one item also is easy, thanks to InsertRange method:

myList.InsertRange(index, newItems);

And finally using following code you can find the index of an item in list:

var index = myList.FindIndex(x => x.Whatever == whatever); // e.g x.Id == id

Answer 4

Another approach, if there is a computationally viable way of sorting the elements, is:

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));

Answer 5

You can just use List.Insert() instead of List.Add() to insert items at a specific position.