using Abp.UI;

using Abp.Web.Models;

using System;

using System.Collections.Generic;

using System.Configuration;

using System.IO;

using System.Linq;

using System.Net;

using System.Net.Http;

using System.Threading.Tasks;

using System.Web.Http;

namespace OwnerSayCar.Web.ApiControllers

{

    [RoutePrefix("api/upload")]

    public class UploadController : ApiController

    {

        [DontWrapResult]

        [Route("img"), HttpPost]

        public async Task ImgFromDataUploadAsync()

        {

            if (!Request.Content.IsMimeMultipartContent())

                throw new UserFriendlyException("上传格式不是multipart/form-data");

            string UploadImgType = !string.IsNullOrWhiteSpace(ConfigurationManager.AppSettings.Get("UploadImgType")) ?

                ConfigurationManager.AppSettings.Get("UploadImgType") : "jpg,png,gif";

            string UploadSaveImgPath = !string.IsNullOrWhiteSpace(ConfigurationManager.AppSettings.Get("UploadSaveImgPath")) ?

                ConfigurationManager.AppSettings.Get("UploadSaveImgPath") : "/Resource/Images";

            int.TryParse(ConfigurationManager.AppSettings.Get("UploadImgMaxByte"), out int UploadImgMaxByte);

            UploadImgMaxByte = UploadImgMaxByte >  ? UploadImgMaxByte : ;

            //创建保存上传文件的物理路径

            var root = System.Web.Hosting.HostingEnvironment.MapPath(UploadSaveImgPath);

            //如果路径不存在，创建路径

            if (!Directory.Exists(root)) Directory.CreateDirectory(root);

            var provider = new MultipartFormDataStreamProvider(root);

            //读取 MIME 多部分消息中的所有正文部分，并生成一组 HttpContent 实例作为结果

            await Request.Content.ReadAsMultipartAsync(provider);

            foreach (var file in provider.FileData)

            {

                //获取上传文件名 这里获取含有双引号'" '

                string fileName = file.Headers.ContentDisposition.FileName.Trim('"');

                //获取上传文件后缀名

                string fileExt = fileName.Substring(fileName.LastIndexOf('.'));

                FileInfo fileInfo = new FileInfo(file.LocalFileName);

                if (fileInfo.Length >  && fileInfo.Length <= UploadImgMaxByte)

                {

                    if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(UploadImgType.Split(','), fileExt.Substring().ToLower()) == -)

                    {

                        fileInfo.Delete();

                        throw new UserFriendlyException("上传的文件格式不支持");

                    }

                    else

                    {

                        //string newFileName = fileInfo.Name + fileExt;

                        string newFileName = Guid.NewGuid().ToString() + fileExt;

                        //最后保存文件路径

                        string saveUrl = Path.Combine(root, newFileName);

                        fileInfo.MoveTo(saveUrl);

                    }

                }

                else

                {

                    fileInfo.Delete();

                    throw new UserFriendlyException("上传文件的大小不符合");

                }

            }

        }

    }

}

Error reading MIME multipart body part

web.config:

<system.web>

   <!--设置允许请求的长度，比如设置为1GB-->

   <httpRuntime targetFramework="4.5.1" maxRequestLength="" />

</system.web>