System/Linq/Enumerable.cs

gistfile1.cs

public static bool Any<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate) {
    if (source == null) throw Error.ArgumentNull("source");
    if (predicate == null) throw Error.ArgumentNull("predicate"); 
    foreach (TSource element in source) {
        if (predicate(element)) return true; 
    } 
    return false;
} 

public static bool All<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate) {
    if (source == null) throw Error.ArgumentNull("source");
    if (predicate == null) throw Error.ArgumentNull("predicate"); 
    foreach (TSource element in source) {
        if (!predicate(element)) return false; 
    } 
    return true;
}