.net mvc 使用盛派Senparc.Weixin 上传图片接口

首先获取微信签名，Controller代码：

public ActionResult MutualHelpAdd()

        {

            var jssdkUiPackage = JSSDKHelper.GetJsSdkUiPackage(WeChatParameter._appID, WeChatParameter._appSecret, Request.Url.AbsoluteUri);

            ViewBag.AppId = WeChatParameter._appID;

            ViewBag.Timestamp = jssdkUiPackage.Timestamp;

            ViewBag.NonceStr = jssdkUiPackage.NonceStr;

            ViewBag.Signature = jssdkUiPackage.Signature;
return View();

        }

视图代码：

  wx.config({

            //debug: true,

            appId: '@ViewBag.AppId',

            timestamp: '@ViewBag.Timestamp',

            nonceStr: '@ViewBag.NonceStr',

            signature: '@ViewBag.Signature',

            jsApiList: [

               'chooseImage',

               'previewImage',

               'uploadImage',

               'downloadImage'

            ]

        });
wx.ready(function () {
// 5 图片接口

            // 5.1 拍照、本地选图

            var images = {

                localId: [],

                serverId: []

            };

            document.querySelector('#btnAddImage').onclick = function () {

                wx.chooseImage({

                    count: , // 默认9，设置可以同时上传的图片数量

                    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) {

                        images.localId = res.localIds;

                        //alert('已选择 ' + res.localIds.length + ' 张图片');
var i = , length = images.localId.length;

                        images.serverId = [];

                        function upload() {

                            wx.uploadImage({

                                localId: images.localId[i],

                                success: function (res) {

                                    i++;

                                    //alert('已上传：' + i + '/' + length);

                                    images.serverId.push(res.serverId);
//TODO: res.serverId 就是 media_id，根据它去微信服务器读取图片数据：自定义上传到自己服务器

                                    var imageJson = $("#hdImageJson").val();
$.ajax({

                                        type: 'post',

                                        url: '/Common/AddImage',

                                        async: false,

                                        data: {

                                            media_id: res.serverId,

                                            imageJson: imageJson,

                                            folderName:"MutualHelp"

                                        },

                                        success: function (data) {

                                            if (data.ImageUrl != '') {

                                                // 返回 图片在我们自己的服务器的url

                                                var img = "<img class='task_image' src='/images/" + data.ImageUrl + "'/>";

                                                $("#imgList").append(img);

                                                $("#hdImageJson").val(data.ImageJson);

                                            }

                                        },

                                        error: function (err) {
}

                                    })
if (i < length) {

                                        upload();

                                    }

                                },

                                fail: function (res) {

                                    alert(JSON.stringify(res));

                                }

                            });

                        }

                        upload();
}

                });

            };
});

图片保存到本地服务器方法：

  /// <summary>

        /// 公用 微信 上传图片方法

        /// </summary>

        /// <param name="media_id"></param>

        /// <param name="imageJson"></param>

        /// <returns></returns>

        public JsonResult AddImage(string media_id, string imageJson,string folderName)

        {

            var imgUrl = "";

            try

            {

                List<ImageList> curImageResult;

                if (!string.IsNullOrEmpty(imageJson))

                {

                    curImageResult = JsonConvert.DeserializeObject<List<ImageList>>(imageJson);

                }

                else

                {

                    curImageResult = new List<ImageList>();

                }

                var accessToken = AccessTokenContainer.TryGetAccessToken(WeChatParameter._appID, WeChatParameter._appSecret);
System.IO.MemoryStream stream = new System.IO.MemoryStream();

                MediaApi.Get(accessToken, media_id, stream);

                Image img = Image.FromStream(stream);

                var imgName = DateTime.Now.ToString("yyyyMMddhhss");

                var fileSaveUrl =string.Format(FilePath + "/{0}/" + imgName + ".jpg", folderName);

                imgUrl = string.Format("/{0}/" + imgName + ".jpg", folderName);

                img.Save(fileSaveUrl);
var imageEntity = new ImageList

                {

                    ImageKey = imgName,

                    ImageUrl = imgUrl,

                    UploadTime = DateTime.Now

                };

                curImageResult.Add(imageEntity);
imageJson = JsonConvert.SerializeObject(curImageResult);

            }

            catch (Exception ex)

            {

                imgUrl = "";

            }
var result = new

            {

                ImageJson = imageJson,

                ImageUrl = imgUrl

            };

            return Json(result);

        }