我有一个非常晦涩的问题，我现在已经努力解决了两三天，我有一个.Net核心应用程序，我部署在K8s。
这是我的部分代码片段。

public static async Task<MessageTranslationResDto> GetRedisCache(string uuid, string languageCode, string messageCode, string channel, IDistributedCache distributedCache, IConfiguration configuration)
{
    try
    {
        var URL = configuration["MessageTranslationService"];
        HttpClient client = new HttpClient();
        client.BaseAddress = new Uri(URL);

        var StartTimeAPI = DateTime.Now;
        var httpContent = new StringContent(System.Text.Json.JsonSerializer.Serialize(messageTransalationReqDto), Encoding.UTF8, "application/json");
        var response = await client.PostAsync(URL, httpContent);
        var responseContent = await response.Content.ReadAsStringAsync();
        var user = JsonConvert.DeserializeObject<MessageTranslationResDto>(responseContent);

        var redival = configuration["RedisExpiration"];
        if (!String.IsNullOrEmpty(redival))
        {
            Console.WriteLine("RedisExpiration is : " + redival);
        }
        else
        {
            Console.WriteLine("RedisExpiration is not available");
        }
    }
    catch (Exception ex)
    {

    }
}

和Yaml文件如下，

apiVersion: v1
kind: ConfigMap
metadata:  
  labels:
    app: ms-common
  name: ms-common-configmap
data:
  appsettings.common.json: |-
    {
      "Logging": {
        "LogLevel": {
          "Default": "Information",
          "Microsoft": "Warning",
          "Microsoft.Hosting.Lifetime": "Information"
        }
      },
      "AllowedHosts": "*",
      "RabbitMQ": {
        "HostUrl": "*"
      }
      "ConnectionStrings": {
        "DMAIN": "***",
        "DADMIN": "***"
      },
      "Environment": "Dev",
      "Otlp": {
        "Endpoint": ""
      },
      "AspNetCoreInstrumentation": {
        "RecordException": "true"
      },
      "UseTracingExporter": "otlp",
      "UseMetricsExporter": "otlp",
      "ExceptionHandlingService": "",
      "RedisConnection": "***",
      "MessageTranslationService": "http://test/api/message",
      "RedisExpiration": "30"
    }

---
apiVersion: v1
kind: Secret
metadata:
  labels:
    app: ms-common
  name: ms-common-secret
data:  
  MessageTranslationService: dsdsdssd==
  ExceptionHandlingService: dsdsdsdsdsfs==
  RedisConnection: cm########wMA==
  ConnectionStrings__DMAIN: test1=
  ConnectionStrings__DADMIN: test==
type: Opaque

问题是在获取**"RedisExpiration"时，它始终返回null。在获取配置值时，仅为此"RedisExpiration"值返回null，其他值 正确接收。例如"MessageTranslationService"**。可能的原因是什么？