asp.net core 上传多个文件

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace NetCoreLoadFilesSample
{
    public class Program
    {
        public static void Main（string[] args）
        {
            BuildWebHost（args）.Run（）;
        }

        public static IWebHost BuildWebHost（string[] args） =>
            WebHost.CreateDefaultBuilder（args）
                .UseStartup（）
                .Build（）;
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\.vs\
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\.vs\NetCoreLoadFilesSample\
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\.vs\NetCoreLoadFilesSample\v15\
     文件       82944  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\.vs\NetCoreLoadFilesSample\v15\.suo
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\.vs\NetCoreLoadFilesSample\v15\sqlite3\
     文件     1978368  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\.vs\NetCoreLoadFilesSample\v15\sqlite3\storage.ide
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\.vs\config\
     文件       79302  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\.vs\config\applicationhost.config
     文件        1137  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample.sln
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\
     文件          12  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\.gitignore
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Controllers\
     文件        2385  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Controllers\HomeController.cs
     文件         934  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Controllers\ValuesController.cs
     文件         382  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\NetCoreLoadFilesSample.csproj
     文件         614  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Program.cs
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Properties\
     文件         701  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Properties\launchSettings.json
     文件        2281  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Startup.cs
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\Home\
     文件         701  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\Home\Index.cshtml
     文件         702  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\Home\Upload.cshtml
     文件        1230  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\Home\UploadFiles.cshtml
     目录           0  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\Shared\
     文件         710  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\Shared\Error.cshtml
     文件        3168  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\Shared\_Layout.cshtml
     文件        1160  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\Shared\_ValidationscriptsPartial.cshtml
     文件          86  2017-09-12 08:32  NetCoreLoadFilesSample-master\NetCoreLoadFilesSample\NetCoreLoadFilesSample\Views\_ViewImports.cshtml
............此处省略346个文件信息