高度封装精简版MD5加解密

using资源管理、横线替换、大小写转换，用方法MD5HashExeute统一管理，需要改动只改这一个地方，无需两个方法都改

 public class MD5Helper
    {
        public static string PasswordSalt
        {
            get { return "landic"; }
        }
        public static string MD5Hash(string input)
        {
            var result = MD5HashExeute((md5) => md5.ComputeHash(Encoding.ASCII.GetBytes(input)));
            return result;
        }
        public static string MD5Hash(Stream inputStream)
        {
            var result = MD5HashExeute((md5) => md5.ComputeHash(inputStream));
            return result;
        }
        private static string MD5HashExeute(Func func)
        {
            using (var md5 = MD5.Create())
            {
                var value = func(md5);
                var result = BitConverter.ToString(value);
                return result.Replace("-", "").ToLower();
            }
        }
        public static string GetPassword(string password)
        {
            var res = MD5Hash(password + PasswordSalt);
            return res;
        }
    }