Asp.Net Core文件上传IFormFile

　　文件上传功能在实际开发中经常使用，在 .Net Core中，文件上传接收类型不再使用 HttpPostedFile 或 HttpFileCollection来接收，而是使用 IFormFile 或 IFormFileCollection来接收。

　　下面看一个例子就明白怎么使用了，具体代码如下：

<div class="form-group">
    <form enctype="multipart/form-data" asp-controller="home" asp-action="upload" method="post">
        <input type="file" name="input" id="input" class="custom-file-input" />
        <label class="custom-file-label" for="input"></label>
        <input type="submit" value="提交" />
    </form>
</div>


@section scripts{
    <script>
        $(document).ready(function () {
            $(".custom-file-input").on("change", function () {
                var fileName = $(this).val().split("\\").pop();
                $(this).next(".custom-file-label").html(fileName);
            })
        });
    </script>
}

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using FileUpload.Models;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Hosting;
using System.IO;

namespace FileUpload.Controllers
{
    public class HomeController : Controller
    {
        private readonly IHostingEnvironment _hostingEnvironment;

        public HomeController(IHostingEnvironment hostingEnvironment)
        {
            _hostingEnvironment = hostingEnvironment;
        }

        public IActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public IActionResult Upload(IFormFile input)
        {
            if (input == null) return BadRequest();

            string uploadsFolder = Path.Combine(_hostingEnvironment.WebRootPath, "images");
            string uniqueFileName = Guid.NewGuid().ToString() + "_" + input.FileName;

            string filePath = Path.Combine(uploadsFolder,uniqueFileName);

            input.CopyTo(new FileStream(filePath, FileMode.Create));


            return Ok();
        }
    }
}

　　多文件上传

<div class="form-group">
    <form enctype="multipart/form-data" asp-controller="home" asp-action="upload" method="post">
        <input type="file" name="input" id="input" class="custom-file-input" multiple />
        <label class="custom-file-label" for="input"></label>
        <input type="submit" value="提交" />
    </form>
</div>


@section scripts{
    <script>
        $(document).ready(function () {
            $(".custom-file-input").on("change", function () {

                var fileLabel = $(this).next(".coustom-file-lable");
                var files = $(this)[0].files;
                if (files.length > 1) {
                    fileLabel.html("你已选择了" + files.length + "个文件");
                } else {
                    fileLabel.html(files[0].name);
                }
            })
        });
    </script>
}

  [HttpPost]
        public IActionResult Upload(IFormFileCollection input)
        {
            if (input == null) return BadRequest();

            string uploadsFolder = Path.Combine(_hostingEnvironment.WebRootPath, "images");
            string uniqueFileName = Guid.NewGuid().ToString() + "_" + input[0].FileName;

            string filePath = Path.Combine(uploadsFolder,uniqueFileName);

            input[0].CopyTo(new FileStream(filePath, FileMode.Create));


            return Ok();
        }

原文地址：https://www.cnblogs.com/jesen1315/p/11459838.html