C# Array initialization - with non-default value

Question

What is the slickest way to initialize an array of dynamic size in C# that you know of?

This is the best I could come up with

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Answer 1

EDIT: as a commenter pointed out, my original implementation didn't work. This version works but is rather un-slick being based around a for loop.

If you're willing to create an extension method, you could try this

public static T[] SetAllValues(this T[] array, T value) where T : struct
{
    for (int i = 0; i < array.Length; i++)
        array[i] = value;

    return array;
}

and then invoke it like this

bool[] tenTrueBoolsInAnArray = new bool[10].SetAllValues(true);

As an alternative, if you're happy with having a class hanging around, you could try something like this

public static class ArrayOf
{
    public static T[] Create(int size, T initialValue)
    {
        T[] array = (T[])Array.CreateInstance(typeof(T), size);
        for (int i = 0; i < array.Length; i++)
            array[i] = initialValue;
        return array;
    }
}

which you can invoke like

bool[] tenTrueBoolsInAnArray = ArrayOf.Create(10, true);

Not sure which I prefer, although I do lurv extension methods lots and lots in general.