27.6 Parallel的静态For，Foreach和Invoke方法-优快云博客

本文探讨了C#中使用并行计算的方法，包括并行循环和并行调用，以提高多核处理器上的执行效率。同时，详细介绍了如何使用Parallel.ForEach结合目录遍历API统计指定路径下所有文件的总大小，展示了并行处理在实际应用中的优势。

        static void Main(string[] args)
        {
            //for (int i = 0; i < 10000; i++)
            //    DoWork(i);

            //Parallel.For(0, 10000, i => DoWork(i));

            //Mehtod1();
            //Mehtod2();
            //Mehtod3();

            Parallel.Invoke(() => Mehtod1(), () => Mehtod2(), () => Mehtod3());

            Console.ReadKey();
        }
        private static void DoWork(int a)
        {
            Console.WriteLine(a);
        }
        private static void Mehtod1()
        {
            Console.WriteLine("Mehtod1");
        }
        private static void Mehtod2()
        {
            Console.WriteLine("Mehtod2");
        }
        private static void Mehtod3()
        {
            Console.WriteLine("Mehtod3");
        }

        static void Main(string[] args)
        {
            var a = DirectoryBytes(@"I:\BaiduNetdiskDownload", "*.*", SearchOption.AllDirectories);
            Console.ReadKey();
        }
        private static long DirectoryBytes(string path, string searchPattern, SearchOption searchOption)
        {
            var files = Directory.EnumerateFiles(path, searchPattern, searchOption);
            long masterTotal = 0;
            ParallelLoopResult result = Parallel.ForEach<string, long>(files,
                () => { return 0; /*每个任务开始前，总计值都初始化为0*/},
                (file, loopState, index, taskLocalTotal) =>
                {
                    long fileLength = 0;
                    FileStream fs = null;
                    try
                    {
                        fs = File.OpenRead(file);
                        fileLength = fs.Length;
                    }
                    catch (Exception) {/*忽略拒绝访问过得文件*/ }
                    finally { if (fs != null) fs.Close(); }
                    return taskLocalTotal += fileLength;
                },
                taskLocalTotal => { Interlocked.Add(ref masterTotal, taskLocalTotal); }
                );
            return masterTotal;
        }