一个序列的扩展函数的帮助类

/// <summary>
/// 序列的扩展函数
/// </summary>
public static class IEnumerableExtensions {
/// <summary>
/// 添加对象到指定的序列中，如果对象不等于null
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="elements">序列</param>
/// <param name="element">添加的对象</param>
/// <returns></returns>
public static IEnumerable<T> ConcatIfNotNull<T>(
this IEnumerable<T> elements, T element) {
if (element != null) {
return elements.Concat(new[] { element });
}
return elements;
}

/// <summary>
/// 对序列中的每一个元素执行指定的函数
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="elements">序列</param>
/// <param name="action">执行的函数</param>
/// <returns></returns>
public static void ForEach<T>(
this IEnumerable<T> elements, Action<T> action) {
foreach (var element in elements) {
action(element);
}
}
}