C#集合运算.docx

C#集合运算

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionAlgebra
{
    class Program
    {
        static void Main(string[] args)
        {
            /// Mozaic集合
            IEnumerable<object> Mozaic = new object[] { new object(), 1, 3, 5, 7, 9, "\"thing\"", Guid.NewGuid() };
            Print("Mozaic集合的内容: {0}", Mozaic);

            /// 偶数集合
            IEnumerable<int> EvenNumber = new int[] { 0, 2, 4, 6, 8 };
            Print("\n偶数集合的内容: {0}", EvenNumber);

            /// 奇数集合
            IEnumerable<int> OddNumber = Mozaic.OfType<int>();
            Print("\n奇数集合的内容: {0}", OddNumber);

            /// 集合操作
            IEnumerable<int> EvenOddSet = EvenNumber.Union(OddNumber);
            Print("\n奇数与偶数集合的并集: {0}", EvenOddSet);

            Print("\n整数集合与偶数集合的并集: {0}", EvenOddSet.Union(EvenNumber));

            Print("\n整数集合与奇数集合相连接: {0}", EvenOddSet.Concat(OddNumber));

            Print("\n整数集合与偶数集合的交集: {0}", EvenOddSet.Intersect(EvenNumber));

            Print("\n整数集合与奇数集合连接，再删除重复值: {0}", EvenOddSet.Concat(OddNumber).Distinct());

            if (!EvenOddSet.SequenceEqual(EvenOddSet.Concat(OddNumber).Distinct()))
            {
                throw new Exception("Unexpectedly unequal");
            }
            else
            {

                Print("\n反转整数集合: {0}", EvenOddSet.Reverse());
                Print("\n求整数集合的平均值: {0}", EvenOddSet.Average());
                Print("\n求整数集合的总和: {0}", EvenOddSet.Sum());
                Print("\n求整数集合的最大值: {0}", EvenOddSet.Max());
                Print("\n求整数集合的最小值: {0}", EvenOddSet.Min());
            }

            Console.ReadKey();
        }

        /// <summary>
        /// 打印
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="format"></param>
        /// <param name="items"></param>
        private static void Print<T>(string format, IEnumerable<T> items)
        {
            StringBuilder text = new StringBuilder();

            foreach (T item in items.Take(items.Count() - 1))
            {
                text.Append(item + ", ");
            }

            text.Append(items.Last());
            Console.WriteLine(format, text);
        }

        /// <summary>
        /// 打印
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="format"></param>
        /// <param name="item"></param>
        private static void Print<T>(string format, T item)
        {
            Console.WriteLine(format, item);
        }
    }
}