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copied!<p>EDIT: added usage example, added a ForFirst method, reordered my paragraphs.</p> <p>Below is a complete solution.</p> <p>Usage is either of the following:</p> <pre><code> list.ForFirst(DoWorkForFirst).ForRemainder(DoWork); // or list.ForNext(1, DoWorkForFirst).ForRemainder(DoWork); </code></pre> <p>The crux is the <code>ForNext</code> method, which performs an action for the specified next set of items from the collection and returns the remaining items. I've also implemented a <code>ForFirst</code> method that simply calls ForNext with count: 1.</p> <pre><code>class Program { static void Main(string[] args) { List<string> list = new List<string>(); // ... list.ForNext(1, DoWorkForFirst).ForRemainder(DoWork); } static void DoWorkForFirst(string s) { // do work for first item } static void DoWork(string s) { // do work for remaining items } } public static class EnumerableExtensions { public static IEnumerable<T> ForFirst<T>(this IEnumerable<T> enumerable, Action<T> action) { return enumerable.ForNext(1, action); } public static IEnumerable<T> ForNext<T>(this IEnumerable<T> enumerable, int count, Action<T> action) { if (enumerable == null) throw new ArgumentNullException("enumerable"); using (var enumerator = enumerable.GetEnumerator()) { // perform the action for the first <count> items of the collection while (count > 0) { if (!enumerator.MoveNext()) throw new ArgumentOutOfRangeException(string.Format(System.Globalization.CultureInfo.InvariantCulture, "Unexpected end of collection reached. Expected {0} more items in the collection.", count)); action(enumerator.Current); count--; } // return the remainder of the collection via an iterator while (enumerator.MoveNext()) { yield return enumerator.Current; } } } public static void ForRemainder<T>(this IEnumerable<T> enumerable, Action<T> action) { if (enumerable == null) throw new ArgumentNullException("enumerable"); foreach (var item in enumerable) { action(item); } } } </code></pre> <p>I felt a bit ridiculous making the <code>ForRemainder</code> method; I could swear that I was re-implementing a built-in function with that, but it wasn't coming to mind and I couldn't find an equivalent after glancing around a bit. UPDATE: After reading the other answers, I see there apparently isn't an equivalent built into Linq. I don't feel so bad now.</p>

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