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

Whilst I wouldn't personally do this, there is another way using enumerators, which alleviates the need for conditional logic. Something like this:

void Main()
{
    var numbers = Enumerable.Range(1, 5);
    IEnumerator num = numbers.GetEnumerator();

    num.MoveNext();
    ProcessFirstItem(num.Current); // First item

    while(num.MoveNext()) // Iterate rest
    {
        Console.WriteLine(num.Current);
    }

}

    void ProcessFirstItem(object first)
    {
        Console.WriteLine("First is: " + first);
    }

Sample output would be:

First is: 1
2
3
4
5