Qiniu.Conf.Config.ACCESS_KEY = "5iujaJ62Q9eQc94uF0sgFzxwVTP-9c_hKq_2jC-j";
Qiniu.Conf.Config.SECRET_KEY = "RMRV45M6J-GpLvz2pAgndn3i-MmTxnDcJMqwsWKG";

private const string Bucket = "grapecity";
private const string Domain = Bucket + ".qiniudn.com";

       public void List(ListView listView1, string bucket = Bucket)
        {
            Qiniu.RSF.RSFClient rsf = new Qiniu.RSF.RSFClient(bucket);
            rsf.Prefix = "";
            rsf.Limit = 100;
            List<DumpItem> items;
            while ((items = rsf.Next()) != null)
            {
                foreach (DumpItem item in items)
                {
                    Stat(listView1, item.Key, bucket);
                }
            }
        }

        public void Stat(ListView listView1, string key, string bucket = Bucket)
        {

            RSClient client = new RSClient();
            Entry entry = client.Stat(new EntryPath(bucket, key));
            if (entry.OK)
            {
                ListViewItem item = new ListViewItem(new string[]{key, entry.MimeType, 
                    DateTime.FromFileTime(entry.PutTime).ToLongDateString(), entry.Fsize.ToString()});
                listView1.Items.Add(item);
            }
            else
            {
                Console.WriteLine("Failed to Stat");
            }
        }

      public bool Delete(string key, string bucket = Bucket)
        {
            RSClient client = new RSClient();
            CallRet ret = client.Delete(new EntryPath(bucket, key));
            return ret.OK;
        }

        public string DownLoad(string key1, string domain = Domain)
        {
            string baseUrl = GetPolicy.MakeBaseUrl(domain, key1);
            string private_url = GetPolicy.MakeRequest(baseUrl);
            private_url = HttpUtility.UrlPathEncode(private_url);

            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(private_url);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream stream = response.GetResponseStream();
                string newFile = AppDomain.CurrentDomain.BaseDirectory + key1;
                FileStream write = new FileStream(newFile, FileMode.OpenOrCreate);

                stream.CopyTo(write);

                stream.Close();
                write.Close();

                return newFile;
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.Assert(false, ex.Message);
                return "";
            }
        }