这里的主要思路是利用html5 File api的slice方法把文件分块，然后new一个FormData()对象用于储存文件数据，之后就是递归调用AjaxFile方法直至上传完毕。
2.后台C#：
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(@"E: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(@"E: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(@"E: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;
}
}
}
