1/  multipart/form-data方式 

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 > 0 ? UploadImgMaxByte : 5242880;            //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 > 0 && fileInfo.Length <= UploadImgMaxByte)                {                    if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(UploadImgType.Split(','), fileExt.Substring(1).ToLower()) == -1)                    {                        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:

Error reading MIME multipart body part

解决方法：

web.config: