1/ multipart/form-data方式

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Web.Http;

namespace FileUpload.Controllers
{
    [RoutePrefix("api/upload")]
    public class UploadController : ApiController
    {

        [Route(
 
"file"), HttpPost]
        public async Task<bool> ImgFromDataUploadAsync()
        {
            if (!Request.Content.IsMimeMultipartContent())
                throw new Exception("is no file");



            //web api 獲取項目根目錄下指定的文件下
            var root = System.Web.Hosting.HostingEnvironment.MapPath("
 
/Resource/Images");

            //如果路徑不存在，創建路徑  
            if (!Directory.Exists(root))
                Directory.CreateDirectory(root);

            var provider = new MultipartFormDataStreamProvider(root);

            //文件已經上傳  但是文件沒有後綴名  需要給文件添加後綴名
            await Request.Content.ReadAsMultipartAsync(provider);

            
 
foreach (var file in provider.FileData)
            {
                //這裏獲取含有雙引號‘" ‘
                string filename = file.Headers.ContentDisposition.FileName.Trim(‘"‘);
                //獲取對應文件後綴名
                string fileExt = filename.Substring(filename.LastIndexOf(‘.‘));

                FileInfo fileinfo = new FileInfo(file.LocalFileName);
                //fileinfo.Name 上傳後的文件路徑 此處不含後綴名 
                //修改文件名 添加後綴名
                string newFilename = fileinfo.Name + fileExt;
                //最後保存文件路徑
                string saveUrl = Path.Combine(root, newFilename);
                fileinfo.MoveTo(saveUrl);
            }
            return true;


        }

    }
}

Webapi文件上傳