I want to do some performance measurement for a method that does some work with int arrays, so I wrote the following class:

public class TimeKeeper
{
    public TimeSpan Measure(Action[] actions)
    {
        var watch = new Stopwatch();
        watch.Start();
        foreach (var action in actions)
        {
            action();
        }
        return watch.Elapsed;
    }
}

But I can not call the Measure mehotd for the example below:

var elpased = new TimeKeeper();
elpased.Measure(
    () =>
    new Action[]
        {
            FillArray(ref a, "a", 10000),
            FillArray(ref a, "a", 10000),
            FillArray(ref a, "a", 10000)
        });

I get the following errors:

Cannot convert lambda expression to type 'System.Action[]' because it is not a delegate type
Cannot implicitly convert type 'void' to 'System.Action'
Cannot implicitly convert type 'void' to 'System.Action'
Cannot implicitly convert type 'void' to 'System.Action'

Here is the method that works with arrays:

private void FillArray(ref int[] array, string name, int count)
{
    array = new int[count];

    for (int i = 0; i < array.Length; i++)
    {
        array[i] = i;
    }

    Console.WriteLine("Array {0} is now filled up with {1} values", name, count);
}

What I am doing wrong?