在GitHub上有个项目，本来是作为自己研究学习.net core的Demo，没想到很多同学在看，还给了很多星，所以觉得应该升成3.0，整理一下，写成博分享给学习.net core的同学们。

项目名称：Asp.NetCoreExperiment

项目地址：https://github.com/axzxs2001/Asp.NetCoreExperiment

 

今天先分享几个对集合知识点。

两个集合对比代码：

GitHub代码库（https://github.com/axzxs2001/Asp.NetCoreExperiment/tree/master/Asp.NetCoreExperiment/Common/CompareCollections）

        static void Main(string[] args)
        {
            var leftKes = new List<string>() { "111111", "222222", "333333", "444444" };
            var rightKes = new List<string>() { "333333", "444444", "555555", "666666" };

            Console.WriteLine("Left集合");
            Console.WriteLine(string.Join(',', leftKes));
            Console.WriteLine("-------------------------------------");

            Console.WriteLine("Right集合");
            Console.WriteLine(string.Join(',', rightKes));
            Console.WriteLine("-------------------------------------");

            Console.WriteLine("Left多的 ");
            Console.WriteLine(string.Join(',', leftKes.Except(rightKes)));
            Console.WriteLine("-------------------------------------");

            Console.WriteLine("Right多的 ");
            Console.WriteLine(string.Join(',', rightKes.Except(leftKes).ToList()));
            Console.WriteLine("-------------------------------------");

            Console.WriteLine("Left和Right交集 ");
            Console.WriteLine(string.Join(',', rightKes.Intersect(leftKes)));
            Console.WriteLine("-------------------------------------");

            Console.WriteLine("Left和Right并集 ");
            Console.WriteLine(string.Join(',', leftKes.Union(rightKes)));
            Console.WriteLine("-------------------------------------");

            Console.WriteLine("Left和Right对称差集 ");
            Console.WriteLine(string.Join(',', leftKes.Union(rightKes).Except(rightKes.Intersect(leftKes))));
            Console.WriteLine("-------------------------------------");

        }

 

运行速度测试代码：

GitHub代码库（https://github.com/axzxs2001/Asp.NetCoreExperiment/tree/master/Asp.NetCoreExperiment/Common/CSharp%E8%8E%B7%E5%8F%96%E4%B8%A4%E4%B8%AA%E9%9B%86%E5%90%88%E4%B8%AD%E7%9B%B8%E5%90%8C%E7%9A%84%E5%92%8C%E4%B8%8D%E5%90%8C%E7%9A%84%E7%BB%93%E6%9E%9C）

        static void Test()
        {
            Console.WriteLine("-------------------开始初始化集合-------------------");
            #region 制造数据
            var watch = new Stopwatch();
            watch.Start();
            var listA = new List<string>();
            var listB = new List<string>();
            for (int i = 0; i < 1000000; i++)
            {
                var id = Guid.NewGuid().ToString();
                listA.Add(id);
            }
            listB.AddRange(listA);
            //制造B的差异数据
            for (int i = 0; i < 10; i++)
            {
                var tick = DateTime.Now.Ticks;
                var random = new Random((int)(tick & 0xffffffffL) | (int)(tick >> 32));
                var index = random.Next(1, 100000);
                listB[index] = Guid.NewGuid().ToString();
            }
            watch.Stop();
            TimeSpan span = watch.Elapsed;
            Console.WriteLine("制造数据总共花费{0}ms.", span.TotalMilliseconds);
            #endregion

            #region 比较
            Console.WriteLine("-------------------开始比较------------