Question

What is the best way to return a subset of a C# array given a fromIndex and toIndex?

Obviously I can use a loop but are there other approaches?

This is the method signature I am looking to fill.

public static FixedSizeList<T> FromExisting(FixedSizeList<T> fixedSizeList, Int32 fromIndex, Int32 toIndex)

FixedSizeList internal implementation is

private T[] _Array;
this._Array = new T[size];

Answer 1

myArray.Skip(fromIndex).Take(toIndex - fromIndex + 1);

EDIT:
The result of Skip and Take are IEnumerable and the count will be zero until you actually use it.

if you try

        int[] myArray = {1, 2, 3, 4, 5};
        int[] subset = myArray.Skip(2).Take(2).ToArray();

subset will be {3, 4}