客户端通过http 传送多文件给服务端

 var path = @"C:\Users\HK\Desktop\项目1\00611844.tif";
            var path2 = @"C:\Users\HK\Desktop\项目1\006118441.tif";
            var uriString = @"http://localhost:5085/icapi/invoice/recognize/upload";
            var url = new Uri(uriString);
            // 设置参数
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = "POST";
            request.Timeout = 10000 * 30;
            string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
            request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
            byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "
");
            byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "--
");

            int pos = path.LastIndexOf("\");
            string fileName = path.Substring(pos + 1);

            int pos2 = path2.LastIndexOf("\");
            string fileName2 = path2.Substring(pos2 + 1);

            //请求头部信息 
            StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name="file";filename="{0}"
Content-Type:application/octet-stream

", fileName));
            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

            //请求头部信息2 
            StringBuilder sbHeader2 = new StringBuilder(string.Format("Content-Disposition:form-data;name="file";filename="{0}"
Content-Type:application/octet-stream

", fileName2));
            byte[] postHeaderBytes2 = Encoding.UTF8.GetBytes(sbHeader2.ToString());

            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            byte[] bArr = new byte[fs.Length];
            fs.Read(bArr, 0, bArr.Length);
            fs.Close();

            FileStream fs2 = new FileStream(path2, FileMode.Open, FileAccess.Read);
            byte[] bArr2 = new byte[fs2.Length];
            fs2.Read(bArr2, 0, bArr2.Length);
            fs2.Close();

            Stream postStream = request.GetRequestStream();
            postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
            postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
            postStream.Write(bArr, 0, bArr.Length);

            postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
            postStream.Write(postHeaderBytes2, 0, postHeaderBytes2.Length);
            postStream.Write(bArr2, 0, bArr2.Length);
            postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
            postStream.Close();

            //发送请求并获取相应回应数据
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程序才开始向目标网页发送Post请求
            Stream instream = response.GetResponseStream();
            StreamReader sr = new StreamReader(instream, Encoding.UTF8);
            //返回结果网页（html）代码
            string content = sr.ReadToEnd();

上面的是客户端

服务端：

通过 

Request.Files即可获得传过来的文件，一般是mvc比较支持文件的传输，但是在配置如果你想自己的方法加上特定的路由如：

[RoutePrefix("icapi/invoice")]
    public class ArgRecognitionApiController : Controller
    {
        [Route("recognize/upload")]
        public JsonResult T()
        {
            JsonResult jsonResult = new JsonResult();
            List<BanthResult> result = new List<BanthResult>();

            jsonResult.Data = result;

            var fileCount = Request.Files.Count;

            for (int i = 0; i < fileCount; i++)
            {
                var file = Request.Files[i];
                BanthResult banthResult = new BanthResult();
                Invoice inv = new Invoice();
                banthResult.invoice = inv;
                banthResult.fileId = file.FileName;
                result.Add(banthResult);
            }
            return jsonResult;
        }
    }

　　这个是后再配置路由的时候要加上

routes.MapMvcAttributeRoutes();