Azure函数从Cosmos Db Mongo集合返回空数据集

Question

我有一个Azure函数，该函数正在查询肯定包含数据的cosmos db mongo集合。

但是，当通过我的azure函数查询时，该函数返回一个空数组。

我的功能类似于：

    [FunctionName("GetAll")]
    public static IActionResult Run([HttpTrigger(AuthorizationLevel.Function, "get", Route = null)]HttpRequest req, 
        TraceWriter log, [Inject(typeof(IWarehouseStateRepository))]IWarehouseStateRepository repoW)
    {
        log.Info("GetAll Function is processing a request");
        var warehouses = repoW.GetAllWarehouses();
        return warehouses != null ? 
            (ActionResult)new OkObjectResult(warehouses) :
            new BadRequestObjectResult("Something went wrong with this request");
    }

我正在为我的仓库存储库注入自定义类型，该类型取决于数据库配置上下文，如下所示：

public class StateContext : IStateContext
{
    private readonly IMongoDatabase _database = null;
    private readonly string _connectionString;
    private readonly string _dbName;
    private readonly string _collectionName;

    public StateContext()
    {

        _connectionString = Environment.GetEnvironmentVariable("AggregateDbConnectionDev");
        _dbName = Environment.GetEnvironmentVariable("AggregateDbNameDev");
        _collectionName = Environment.GetEnvironmentVariable("AggregateDbCollectionDev");

        MongoClientSettings settings = MongoClientSettings.FromUrl(new MongoUrl(_connectionString));
        settings.SslSettings = new SslSettings() { EnabledSslProtocols = SslProtocols.Tls12 };

        var client = new MongoClient(settings);
        if (client != null)
            _database = client.GetDatabase(_dbName);
    }

    public IMongoCollection<WarehouseState> WarehouseState
    {
        get
        {
            return _database.GetCollection<WarehouseState>(_collectionName);
        }
    }
}

该函数不引发任何错误或异常。

回购查询：

    public IEnumerable<WarehouseState> GetAllWarehouses()
    {
        var warehouses = _context.WarehouseState.Find(_ => true).ToList();
        return warehouses;
    }

有没有人知道这里可能出什么问题？我是否需要使用天蓝色功能以其他方式设置cosmos Db连接？

在将逻辑移到天蓝色函数之前，此设置以前已经起作用。