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   源码介绍

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using System.IO;

// For more information on enabling MVC for empty projects, visit http://go.microsoft.com/fwlink/?LinkID=397860

namespace DotNet.Upload.Controllers
{
    public class UploadController : Controller
    {
        // GET: /<controller>/
        public IActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public async Task<ActionResult> UploadFile()
        {
            var data = Request.Form.Files["data"];
            string lastModified = Request.Form["lastModified"].ToString();
            var total = Request.Form["total"];
            var fileName = Request.Form["fileName"];
            var index = Request.Form["index"];

            string temporary = Path.Combine(@"D:\浏览器", lastModified);//临时保存分块的目录
            try
            {
                if (!Directory.Exists(temporary))
                    Directory.CreateDirectory(temporary);
                string filePath = Path.Combine(temporary, index.ToString());
                if (!Convert.IsDBNull(data))
                {
                    await Task.Run(() => {
                        FileStream fs = new FileStream(filePath, FileMode.Create);
                        data.CopyTo(fs);
                    });
                }
                bool mergeOk = false;
                if (total == index)
                {
                    mergeOk = await FileMerge(lastModified, fileName);
                }

                Dictionary<string, object> result = new Dictionary<string, object>();
                result.Add("number", index);
                result.Add("mergeOk", mergeOk);
                return Json(result);

            }
            catch (Exception ex)
            {
                Directory.Delete(temporary);//删除文件夹
                throw ex;
            }
        }

        public async Task<bool> FileMerge(string lastModified,string fileName)
        {
            bool ok = false;
            try
            {
                var temporary = Path.Combine(@"D:\浏览器", lastModified);//临时文件夹
                fileName = Request.Form["fileName"];//文件名
                string fileExt = Path.GetExtension(fileName);//获取文件后缀
                var files = Directory.GetFiles(temporary);//获得下面的所有文件
                var finalPath = Path.Combine(@"D:\浏览器", DateTime.Now.ToString("yyMMddHHmmss")   fileExt);//最终的文件名（demo中保存的是它上传时候的文件名，实际操作肯定不能这样）
                var fs = new FileStream(finalPath, FileMode.Create);
                foreach (var part in files.OrderBy(x => x.Length).ThenBy(x => x))//排一下序，保证从0-N Write
                {
                    var bytes = System.IO.File.ReadAllBytes(part);
                    await fs.WriteAsync(bytes, 0, bytes.Length);
                    bytes = null;
                    System.IO.File.Delete(part);//删除分块
                }
                fs.Close();
                Directory.Delete(temporary);//删除文件夹
                ok = true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return ok;
        }

    }
}