Question

我正在尝试使用带有Nugget软件包Google.Cloud.Firestore的Firestore

使用调试器，我可以看到在尝试调用方法Query.GetSnapshotAsync（）

时，程序的执行停止了。

我只想从集合中获取文档列表。

控制器

+--------------+--------+--------+------------+-------+
| id_dependent |  name  | number | primary_id | Value |
+--------------+--------+--------+------------+-------+
|           51 | Carlos | 956585 |          2 | 15,00 |
|           52 | João   | 985868 |          2 | 13,50 |
|           53 | Jaime  | 985868 |          2 | 11,50 |
|           54 | Evan   | 985847 |          3 | 15,00 |
|           55 | Kaus   | 584788 |          3 | 13,50 |
+--------------+--------+--------+------------+-------+

DataLayer

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Web.Http;
using System.Web.Http.Results;
using FirestoreAPI.Domain.Restaurants;
using FirestoreAPI.Repository.Restaurants;
using System.Threading.Tasks;

namespace FirestoreAPI.Controllers
{
    [RoutePrefix("api")]
    public class RestaurantsController : ApiController
    {
        public RestaurantsController() { }

        [HttpGet]
        [Route("restaurants")]
        public IHttpActionResult GetAllRestaurants()
        {
            //var restAggregate = new RestaurantsAggregate();
            var restaurantsRepo = new RestaurantsRepo();
            return new NegotiatedContentResult<Task<List<Restaurant>>>(
                HttpStatusCode.OK,
                restaurantsRepo.GetAllRestaurants(),
                this
            ); ;
        }
    }
}

餐厅

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Web;
using Google.Cloud.Firestore;

namespace FirestoreAPI.Repository.Restaurants
{
    public class RestaurantsRepo
    {
        //public FirestoreConn dbConn;
        string projectId;
        FirestoreDb firestoreDb;
        public RestaurantsRepo()
        {
            //dbConn = new FirestoreConn();
            string credentials = "C:\\Users\\ezequiel.lopez\\projects\\firestoredotnet\\FirestoreAPI\\firestoreapi-dca55-0be2f7d57f41.json";
            Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", credentials);
            projectId = "firestoreapi-dca55";
            firestoreDb = FirestoreDb.Create(projectId);
        }

        public async Task<List<Restaurant>> GetAllRestaurants()
        {
            //FirestoreDb fsDB = dbConn.GetFSConnection();
            //Query query = fsDB.Collection("restaurants").OrderByDescending("avgRating").Limit(50);
            Query query = firestoreDb.Collection("restaurants").OrderByDescending("avgRating").Limit(50);
            QuerySnapshot restSnaps = await query.GetSnapshotAsync();
            List<Restaurant> restaurants = new List<Restaurant>();

            return restSnaps.Documents
                            .Where<DocumentSnapshot>(ds => ds.Exists)
                            .Select(ds => ds.ConvertTo<Restaurant>()).ToList();
        }
    }
}

Answer 1

我遇到了同样的问题。问题是，我正在从同步方法中调用异步方法。直到我使调用者方法异步并等待它，它才起作用。

GetSnapshotAsync（）永不返回，我也没有收到任何错误。如何调试此问题？

1 个答案: