C#获取七牛云token/删除七牛云图片接口

// 获取七牛token
        public ApiResponse GetQiniuToken(QiniuToken req)
        {
            try
            {
                Mac mac = new Mac(req.AccessKey, req.SecretKey);

                PutPolicy putPolicy = new PutPolicy();
                // putPolicy.Scope = req.Bucket + ":" + key;
                putPolicy.Scope = req.Bucket;
                putPolicy.SetExpires();
                putPolicy.DeleteAfterDays = ;
                string token = Auth.CreateUploadToken(mac, putPolicy.ToJsonString());
                return Success(token);
            }
            catch (Exception ex)
            {
                return Failed("查询七牛token时发生异常，错误描述：" + ex.Message);
            }
        }　

【putPolicy.DeleteAfterDays = 1;　这是个坑，默认值为1，会导致使用接口上传的图片1天后默认删除，所以记得修改官方demo中的默认值。】

// 删除七牛云空间图片
        public ApiResponse DelQiniuPic(QiniuDel req)
        {
            try
            {
                // 空间名
                string Bucket = req.Bucket;
                // 文件名
                string Key = req.Key;
                // 设置存储区域
                Config config = new Config();
                config.Zone = Zone.ZONE_CN_East;
                Mac mac = new Mac(req.AccessKey, req.SecretKey);
                BucketManager bucketManager = new BucketManager(mac, config);
                HttpResult deleteRet = bucketManager.Delete(Bucket, Key);
                Console.WriteLine("delete error: " + deleteRet.ToString());
                if (deleteRet.Code != (int)HttpCode.OK)
                {
                    Console.WriteLine("delete error: " + deleteRet.ToString());
                }
                return Success("已成功删除七牛云端图片！");
            }
            catch (Exception ex)
            {
                return Failed("删除七牛图片时发生异常，错误描述：" + ex.Message);
            }
        }

【此外，对于调用删除接口，链接地址任然能访问的情况，需要清空CDN缓存　https://portal.qiniu.com/cdn/refresh-prefetch】