自定义app.config的<configSections>

<configuration>
  <configSections>
    <!-- 定义自定义配置节 -->
    <sectionGroup name="ServiceConfig">
      <section name="Debug" type="System.Configuration.NameValueSectionHandler"/>
      <section name="Release" type="System.Configuration.NameValueSectionHandler"/>
    </sectionGroup>
  </configSections>

  <!-- 使用自定义配置节 -->
  <ServiceConfig>
    <Debug>
      <add key="AUTHORITY" value="aa"/>
      <add key="APPLICATIONID" value="bb"/>
      <add key="CLIENTSECRET" value="cc"/>
      <add key="RESOURCE" value="dd"/>
      <!--<add key="URI" value="ee"/>-->
      <add key="URI" value="ff"/>
    </Debug>
    <Release>
      <add key="AUTHORITY" value="aa"/>
      <add key="APPLICATIONID" value="bb"/>
      <add key="CLIENTSECRET" value="cc"/>
      <add key="RESOURCE" value="dd"/>
      <!--<add key="URI" value="ee"/>-->
      <add key="URI" value="ff"/>
    </Release>
  </ServiceConfig>
</configuration>

    public class ServiceConfigSection
    {
        public CustomConfigSection Debug { get; set; }
        public CustomConfigSection Release { get; set; }
    }

    public class CustomConfigSection
    {
        public string Authority { get; set; }

        public string ApplicationId { get; set; }

        public string ClientSecret { get; set; }

        public string Resource { get; set; }

        public string Uri { get; set; }
    }

    public class ConfigurationReader
    {
        public static ServiceConfigSection ReadServiceConfiguration()
        {
            ServiceConfigSection serviceConfig = new ServiceConfigSection
            {
                Debug = ParseServiceSection("ServiceConfig/Debug"),
                Release = ParseServiceSection("ServiceConfig/Release")
            };
            return serviceConfig;
        }

        private static CustomConfigSection ParseServiceSection(string sectionName)
        {
            var serviceSection = ConfigurationManager.GetSection(sectionName) as System.Collections.Specialized.NameValueCollection;
            if (serviceSection != null)
            {
                var config = new CustomConfigSection
                {
                    Authority = serviceSection["AUTHORITY"],
                    ApplicationId = serviceSection["APPLICATIONID"],
                    ClientSecret = serviceSection["CLIENTSECRET"],
                    Resource = serviceSection["RESOURCE"],
                    Uri = serviceSection["URI"]
                };
                return config;
            }
            return null;
        }
    }

使用：

 

       /// <summary>
        /// 获取令牌
        /// </summary>
        /// <returns></returns>
        private static string GetToken()
        {
            string accessToken;
            try
            {
                 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
#if DEBUG
                var serviceConfig = ServiceConfig.Debug;
#else
                var ServiceConfig = _serviceConfig.Release;
#endif

                ClientCredential clientCred = new ClientCredential(serviceConfig.ApplicationId, serviceConfig.ClientSecret);
                Task<AuthenticationResult> vauthResult = new AuthenticationContext(serviceConfig.Authority).AcquireTokenAsync(serviceConfig.Resource, clientCred);
                Task.WaitAll(vauthResult);
                accessToken = vauthResult.Result.AccessToken;
            }
            catch (Exception ex)
            {

                if (ex.InnerException != null)
                {
                    WriteExceptions($"Exception : Failed to get Access Token!  { ex.InnerException.Message}");
                    throw;
                }
                WriteExceptions($"Exception : Failed to get Access Token!  {ex.Message}");
                throw;
            }
            return accessToken;
        }

参考：

https://www.cnblogs.com/yibinboy/articles/1649177.html