LinqExtensions

using System;
using System.Linq;

namespace System.Collections.Generic
{
    public static class LinqExtensions
    {
        public static void ForEach<T>(this IEnumerable<T> array, Action<T> action)
        {
            foreach (T item in array)
            {
                if (action != null)
                {
                    action(item);
                }
            }
        }

        public static IEnumerable<T> AsEnumerable<T>(this IEnumerable array)
        {
            foreach (var item in array)
            {
                if (item is T)
                {
                    yield return (T)item;
                }
            }
        }

        /// <summary>
        /// 对枚举进行分组
        /// </summary>
        public static IEnumerable<T[]> GroupArray<T>(this IEnumerable<T> arr, int count)
        {
            List<T> temp = new List<T>();
            foreach (T item in arr)
            {
                if (temp.Count == count)
                {
                    yield return temp.ToArray();
                    temp.Clear();
                }
                temp.Add(item);
            }
            if (temp.Count > 0) yield return temp.ToArray();
        }

        public static IEnumerable<T[]> SplitContent<T>(this T[] array, int count)
        {
            int page_count = (int)Math.Ceiling((double)array.Length / count);
            for (int i = 0; i < page_count; i++)
            {
                int size = i != page_count - 1 ? count : array.Length - i * count;
                T[] temp = new T[size];
                Array.Copy(array, i * count, temp, 0, size);
                yield return temp;
                //yield return array.Skip(i * count).Take(count).ToArray();
            }
        }
    }
}