C# ASCII码排序SH256加密

        #region 1.参数按照ASCII码从小到大排序
        /// <summary>
        /// 参数按照ASCII码从小到大排序（字典序）
        /// </summary>
        /// <param name="paramsMap">参数</param>
        /// <returns></returns>
        public static string GetParamSrc(Dictionary<string, string> paramsMap)
        {
            string resultStr = string.Empty;

            //对参数进行排序处理
            var param = paramsMap.OrderBy(x => x.Key, new ComparerString()).ToDictionary(x => x.Key, y => y.Value);

            if (param != null)
            {
                StringBuilder strParams = new StringBuilder();
                foreach (var kv in param)
                {
                    var pvalue = kv.Value;
                    var pkay = kv.Key;
                    //if (string.IsNullOrEmpty(pvalue) || string.IsNullOrEmpty(pkay)) continue;
                    strParams.Append(string.Format("{0}{1}{2}{3}", pkay, "=", pvalue, "&"));
                }
                resultStr = strParams.Remove(strParams.Length - 1, 1).ToString();
            }

            return resultStr;
        }

        #region 对比
        /// <summary>
        /// 对比
        /// </summary>
        public class ComparerString : IComparer<String>
        {
            public int Compare(String x, String y)
            {
                return string.CompareOrdinal(x, y);
            }
        }
        #endregion

        #endregion

        #region 2.SH256加密
        /// <summary>
        /// SH256加密
        /// </summary>
        /// <param name="toEncrypt"></param>
        /// <returns></returns>
        public static string GetSHA256HashFromString(string toEncrypt)
        {
            byte[] bytValue = Encoding.UTF8.GetBytes(toEncrypt);
            SHA256 sha256 = new SHA256CryptoServiceProvider();
            byte[] retVal = sha256.ComputeHash(bytValue);
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < retVal.Length; i++)
            {
                sb.Append(retVal[i].ToString("x2"));
            }
            return sb.ToString();
        }
        #endregion