dotnet-learn-vs/asyncawait/asyncWhenAll/Program.cs

using System.Linq;

namespace asyncWhenAll
{

    public static class ExtMethod
    {  //扩展语法
       public static int SumMe(this IEnumerable<int> source)
        {
            int sum = 0;
            foreach (var item in source)
            {
                sum += item;
            }
            return sum;
        }
        //扩展语法
        public static IEnumerable<int> WhereMe(this IEnumerable<int> source,Func<int,bool> func)
        {
            foreach (var item in source)
            {
                if (func(item)) yield return item;
            } 
        }
    }

    internal class Program
    {
        static async Task Main(string[] args)
        {
            string[] files = Directory.GetFiles(@"C:\Users\61778\Desktop\enfi-boot-order\enfi-boot-module-system\src\main\java\org\enfi\config\init");
            Task<int>[] tasks  = new Task<int>[files.Length];
            for (int i = 0; i < files.Length; i++)
            {
                tasks[i] = ReadCharsCount(files[i]);
            }
            int[] rs  = await Task.WhenAll(tasks);
            Console.WriteLine(rs.SumMe());
            foreach (var item in rs.WhereMe(n=>n>1200))
            {
                Console.WriteLine(item);
            }

            string cj = "61,90,100,99,18,22,38,66,80,93,55,50,89";
           Console.WriteLine(cj.Split(",").Average(s=>int.Parse(s)));
            
        }
  
        static async Task<int> ReadCharsCount(string filename)
        {
            string s = await File.ReadAllTextAsync(filename);
            return s.Length;
        }

    }
}