AzureでConfigurationSetting 、KeyVaultSecretを取得 (DIなし版)

using System;
using System.Linq;
using Azure.Data.AppConfiguration;
using Azure.Identity;
using Azure.Security.KeyVault.Secrets;
using Microsoft.Azure.WebJobs;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace FunctionApp_v2_tf {
    public class Function1 {

        [FunctionName("Function1")]
        public void Run([TimerTrigger("0 */10 * * * *")] TimerInfo myTimer, ILogger log) {
            log.LogInformation($"C# Timer trigger function Started");

            DefaultAzureCredential credential = new DefaultAzureCredential(new DefaultAzureCredentialOptions());

            // AppConfig:Endpoint
            var configUrl = Environment.GetEnvironmentVariable("AppConfig:Endpoint", EnvironmentVariableTarget.Process);
            ConfigurationClient client = new ConfigurationClient(new Uri(configUrl), credential);
            ConfigurationSetting setting = client.GetConfigurationSetting("configs");
            log.LogInformation(@$"{setting.Value}");

            // KeyVault:Endpoint
            var keyVaultUrl = Environment.GetEnvironmentVariable("KeyVault:Endpoint", EnvironmentVariableTarget.Process);
            SecretClient keyVaultClient = new SecretClient(new Uri(keyVaultUrl), credential);
            KeyVaultSecret secret = keyVaultClient.GetSecret("dbkey");
            string dbkey = secret.Value;
            log.LogInformation(@$"{dbkey}");

        }
    }
}