数组、IEnumerable、List、合分片或分块

/// <summary>
    /// 
    /// </summary>
    public static class IEnumerableExtentions
    {
        /// <summary>
        /// 复制序列中的数据
        /// </summary>
        /// <typeparam name="T">泛型</typeparam>
        /// <param name="iEnumberable">原数据</param>
        /// <param name="startIndex">原数据开始复制的起始位置</param>
        /// <param name="length">需要复制的数据长度</param>
        /// <returns></returns>
        public static IEnumerable<T> Copy<T>(this IEnumerable<T> iEnumberable, int startIndex, int length)
        {
            var sourceArray = iEnumberable.ToArray();
            T[] newArray = new T[length];
            Array.Copy(sourceArray, startIndex, newArray, 0, length);

            return newArray;
        }

        /// <summary>
        /// 给IEnumerable拓展ForEach方法
        /// </summary>
        /// <typeparam name="T">模型类</typeparam>
        /// <param name="iEnumberable">数据源</param>
        /// <param name="func">方法</param>
        public static void ForEach<T>(this IEnumerable<T> iEnumberable, Action<T> func)
        {
            foreach (var item in iEnumberable)
            {
                func(item);
            }
        }

        /// <summary>
        /// 给IEnumerable拓展ForEach方法
        /// </summary>
        /// <typeparam name="T">模型类</typeparam>
        /// <param name="iEnumberable">数据源</param>
        /// <param name="func">方法</param>
        public static void ForEach<T>(this IEnumerable<T> iEnumberable, Action<T, int> func)
        {
            var array = iEnumberable.ToArray();
            for (int i = 0; i < array.Count(); i++)
            {
                func(array[i], i);
            }
        }

        /// <summary>
        /// 分块
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source"></param>
        /// <param name="chunkSize"></param>
        /// <returns></returns>
        public static IEnumerable<IEnumerable<T>> Chunk<T>(this IEnumerable<T> source, int chunkSize)
        {
            return source
                .Select((x, i) => new { Index = i, Value = x })
                .GroupBy(x => x.Index / chunkSize)
                .Select(x => x.Select(v => v.Value).ToList())
                .ToList();
        }