Neat way to write loop that has special logic for the first item in a collection

Question

Often I have to code a loop that needs a special case for the first item, the code never seems as clear as it should ideally be.

Short of a redesign of the C# language,

Answer 1

Here's a slightly simpler extension method that does the job. This is a combination of KeithS's solution and my answer to a related Java question:

public static void ForEach(this IEnumerable elements,
                              Action firstElementAction,
                              Action standardAction)
{
    var currentAction = firstElementAction;
    foreach(T element in elements)
    {
        currentAction(element);
        currentAction = standardAction;
    }
}