Webapi文件上传

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:

<system.web>
   <!--设置允许请求的长度，比如设置为1GB-->
   <httpRuntime targetFramework="4.5.1" maxRequestLength="1073741824" />
</system.web>