常用的辅助工具类

 public static class Utility
    {
        //MD5加密
        public static string GetMD5_32(string s)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] data = md5.ComputeHash(Encoding.UTF8.GetBytes(s));
            StringBuilder sb = new StringBuilder();
            foreach (byte b in data)
                sb.Append(b.ToString("X2"));
            return sb.ToString().ToUpper();
        }
       //获取签名
        public static string GetSign<T>(T t, string key)
        {
            var items = t.GetType().GetProperties().Where(ii => !string.IsNullOrEmpty(ii.GetValue(t)?.ToString())).Select(ii => new { Key = ii.Name, Value = ii.GetValue(t).ToString() }).OrderBy(ii => ii.Key).ToList();
            var item = items.FirstOrDefault(j => j.Key == "sign");
            string sign = GetMD5_32($"{ string.Join("&", items.Select(ii => ii.Key + "=" + ii.Value))}" + key);
            return sign;
            //string str = "";
            ////str += t.GetType().GetProperty("appkey").GetValue(t).ToString()+ t.GetType().GetProperty("hotelid").GetValue(t).ToString()+ t.GetType().GetProperty("loc").GetValue(t).ToString()+ t.GetType().GetProperty("ts").GetValue(t).ToString();
            //List<string> items = t.GetType().GetProperties().Where(ii => !string.IsNullOrEmpty(ii.GetValue(t)?.ToString())).Select(ii =>  ii.GetValue(t).ToString().ToUpper()).ToList();
            //items.Sort();
            //for(int i=0;i<items.Count;i++)
            //{
            //    str += items[i];
            //}
            //string sign = GetMD5_32(str);
            //return sign;

        }
        //发送post请求
        public static T HttpPost<T>(string url, string data)
        {
            WebClient wc = new WebClient();
            wc.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            var ret = wc.UploadData(url, Encoding.UTF8.GetBytes(data));
            return JsonConvert.DeserializeObject<T>(Encoding.UTF8.GetString(ret));
        }
        //去掉json序列化中值为空的字段
        public static string JsonStrGet(object data)
        {
            var jsonSetting = new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore };
            return JsonConvert.SerializeObject(data, Formatting.Indented, jsonSetting);
        }
        //生成时间戳
        public static long GetTimeStamp()
        {
            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            return Convert.ToInt64(ts.TotalSeconds);
        }
        //获取七位数据数
        public static string RandomGet()
        {
            Random random = new Random();
            string s = "";
            for (int i = 0; i < 7; i++)
            {
                s += random.Next(10).ToString();
            }
            return s;
        }