if(Request.Content.IsMimeMultipartContent())

{

             

   var streamProvider =newMultipartMemoryStreamProvider();

   var task =Request.Content.ReadAsMultipartAsync(streamProvider).ContinueWith(t =>//上传多个文件

   {

     foreach(var item in streamProvider.Contents)

     {

       //do something

     }

});

public class UploadFileController : ApiController

    {

        public async Task<string> Post()

        {

            // 检查是否是 multipart/form-data

            if (!Request.Content.IsMimeMultipartContent("form-data"))

                throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);

            // 设置上传目录

            var provider = new MultipartFormDataStreamProvider(@"c:\\temp");

        

            // 接收数据，并保存文件

            var bodyparts = await Request.Content.ReadAsMultipartAsync(provider);

            string result = "";

            // 获取表单数据

            result += "formData txtName: " + bodyparts.FormData["txtName"];

            result += "<br />";

            // 获取文件数据

            result += "fileData headers: " + bodyparts.FileData[0].Headers; // 上传文件相关的头信息

            result += "<br />";

            result += "fileData localFileName: " + bodyparts.FileData[0].LocalFileName; // 文件在服务端的保存地址，需要的话自行 rename 或 move

            return result;

        }

    }