/// <summary>
        /// 添加 JWT 验证
        /// </summary>
        /// <param name="services"></param>
        /// <returns></returns>
        public static IServiceCollection AddJwt(this IServiceCollection services, out JwtIssuerOptions _tokenOptions)
        {
            _tokenOptions = new JwtIssuerOptions();
            var keyDir = PlatformServices.Default.Application.ApplicationBasePath;

            if (!RsaHelper.TryGetKeyParameters(keyDir, true, out RSAParameters keyParameters))
            {
                keyParameters = RsaHelper.CreateAndSaveKey(keyDir);
            }
            var key = new RsaSecurityKey(keyParameters);

            _tokenOptions.Key                = key;
            _tokenOptions.Issuer             = "qdcares_net";
            _tokenOptions.SigningCredentials = new SigningCredentials(_tokenOptions.Key, SecurityAlgorithms.RsaSha256Signature);

            services.AddSingleton <JwtIssuerOptions>(_tokenOptions);
            return(services);
        }