Csharp 将 IConfiguration 注入服务集合时环境变量为空

我正在try 将azure函数中的本地配置传递给另一个项目中的iServiceCollection，该函数与该项目有依赖关系.

我正在工作.净额6

这是我的函数启动.cs基于此question的答案

[assembly: FunctionsStartup(typeof(DatabaseInit.Startup))]
namespace Edos.DatabaseInit;
public class Startup:FunctionsStartup
{


    public override void Configure(IFunctionsHostBuilder builder)
    {
        var configuration = builder.GetContext().Configuration;
       
        builder.Services.AddInfrastructure(configuration);
       
    }

}

这是我的地方.设置.json

{
  "IsEncrypted": false,
  "ServiceBusConnectionString": "myconnectionstring",
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet"
  }
}

我的职能

public class CosmosInit
{
    private readonly IMessagingService _messagingService;


    public CosmosInit(IMessagingService messagingService)
    {
        _messagingService = messagingService;
        
    }
    [FunctionName("CosmosInit")]
    public async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
        ILogger log)
    {

        await _messagingService.PushToTopic("demotopic", "message");

        return new OkObjectResult(responseMessage);
    }
}

以下是Azure函数的依赖项项目中的上述AddInfrastructure方法

public static class DependencyInjection
{
    public static IServiceCollection AddInfrastructure(this IServiceCollection services, IConfiguration configuration)
    { 
        var serviceBusConnectionString = Environment.GetEnvironmentVariable("ServiceBusConnectionString");
        if (string.IsNullOrEmpty(serviceBusConnectionString))
        {
            throw new InvalidOperationException(
                "Please specify a valid ServiceBusConnectionString in the Azure Functions Settings or your local.settings.json file.");
        }

        //using AMQP as transport
        services.AddSingleton((s) => {
            return new ServiceBusClient(serviceBusConnectionString, new ServiceBusClientOptions() { TransportType = ServiceBusTransportType.AmqpWebSockets });
        });
        services.AddScoped<IMessagingService, MessagingService>();

        return services;
    }
}

这就是我的方法(在基础设施项目中)

public class MessagingService: IMessagingService
{
    private readonly ServiceBusClient _serviceBusClient;

    public MessagingService(ServiceBusClient serviceBusClient)
    {
        _serviceBusClient = serviceBusClient;
    }
    // the sender used to publish messages to the topic
    
    public async Task<int> PushToTopic(string topic, string serviceMessage)
    {
        var sender = _serviceBusClient.CreateSender(topic);
        var message = new ServiceBusMessage(serviceMessage);
        await sender.SendMessageAsync(message);
        return 1;

    }
}

但执行时没有错误.但在基础设施项目环境中.GetEnvironmentVariable("ServiceBusConnectionString")仅显示为null.我没有发现它从本地函数获取的配置.设置.json

请建议我做错了什么，或者我如何解决这个问题..请