C# way to add value in a List<T> at index

Question

Is there any way you can add a value at a specific index? I try to do indexator and I have Lists. Is there any trick for making this this in this context :D

 public class Multime<T> {     private List<Multime<T>> multiSets;     private List<T> multimea;       ***public Multime<T> this[int index]     {         get { return this.Multisets.ElementAt(index); }         set { this.Multisets.CopyTo(value,index); }     }***        public List<Multime<T>> Multisets     {         get { return this.multiSets; }         set { this.multiSets = value; }     }//accesori Multimea de multimi      public List<T> Multimea     {         get { return this.multimea; }         set { this.multimea = value; }     }//Accesori Multime 

Answer 1

The .Insert() method on List<T> is exactly for this purpose:

someList.Insert(2, someValue); 

This would modify the someList collection to insert someValue at index 2, pushing other values up one index.

More information here.

Answer 2

List<T>.Insert, perhaps?

But I'd suggest you probably just want to fetch/write - not insert:

public Multime<T> this[int index] {     get { return Multisets[index]; }     set { Multisets[index] = value; } } 

Note that as of C# 3, there are simpler ways of writing those properties, btw:

public List<T> Multimea { get; set; } public List<Multime<T>> Multisets { get; set; } 

It's also not generally a good idea to actually expose composed collections directly - it means you have no control over what happens in those collections.