微信小程序上传文件

wx.chooseImage({
      count: 1, // 默认9
      sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
      sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
      success: function (res) {
        // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
        var tempFilePaths = res.tempFilePaths
        console.log(tempFilePaths[0])
        wx.uploadFile({
      url: 'https://gh.ydfos.com/wxfileUplad/Post', //仅为示例，非真实的接口地址
      filePath: tempFilePaths[0],
      name: 'file',
      formData:{
        'address': 'jinhua',
        'name':'zjh'
      },
      success: function(res2){
        console.log(res2);
        var data = res2.data
        console.log(data);
        //do something
      }
    })
  }
      }
    )

服务端代码

var logCfg = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "config/log4net.config");
            XmlConfigurator.ConfigureAndWatch(logCfg);
            var logger = LogManager.GetLogger("log");

            try
            {

                logger.Info("files:" + Request.Files.Count);
                logger.Info("filename:" + Request.Files[0].FileName);

                string filepath = Server.MapPath("/upload/");
                Stream sin = Request.InputStream;

                string name = Request.QueryString["name"];
                string fileExt = Path.GetExtension(Request.Files[0].FileName).ToLower();
                string fileName = Guid.NewGuid().ToString() + fileExt;
                Request.Files[0].SaveAs(filepath + fileName);

                logger.Info("name:" + Request.Form["name"] + ";address:" + Request.Form["address"]);

                return Json(new { success="ok"}, JsonRequestBehavior.AllowGet);
            }
            catch (Exception ex)
            {
                logger.Error(ex.Message);
                return Json(new { success = "fail" }, JsonRequestBehavior.AllowGet);
            }