web api响应中的额外花括号使响应无法转换为模型

Question

我正在尝试阅读Yelp API。以下是我的代码。

public async Task<HttpContent> InvokeApi(string path, HttpAction action, HttpContent content = null, TimeSpan? overrideTimeout = null, string externalServer = null)
    {

        var sUrl = externalServer == null ? ServerUrl : externalServer;

        using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri(sUrl);
            if (overrideTimeout.HasValue)
            {
                client.Timeout = overrideTimeout.Value;
            }
            //this.Log("Connecting to {0} Api at {1}".Fmt(WebPortalServer, ServerUrl));
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", AccessToken);
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            HttpResponseMessage response;

            switch (action)
            {
                case HttpAction.Get:
                    response = await client.GetAsync(path);
                    break;
                case HttpAction.Post:
                    response = await client.PostAsync(path, content);
                    break;
                case HttpAction.Put:
                    response = await client.PutAsync(path, content);
                    break;
                case HttpAction.Delete:
                    response = await client.DeleteAsync(path);
                    break;
                default:
                    throw new ArgumentOutOfRangeException("action", action, null);
            }

            return response.IsSuccessStatusCode ? response.Content : null;
        }
    }

我将上述函数称为

public async Task<Common.Models.Yelp.Yelp> GetAllBusiness(decimal latitude, decimal longitude)
    {
        var all = await _webPortalApiClient.InvokeApi($"businesses/search?limit=10&latitude={latitude}&longitude={longitude}", HttpAction.Get, null, null, "https://api.yelp.com/v3/");
        if (all == null)
        {
            return null;
        }

        //var business = await all.ReadAsAsync<Common.Models.Yelp.Yelp>();
        var business = all.ReadAsAsync<Object>().Result;
        var result = (Common.Models.Yelp.Yelp)(business);
        return result;
    }

我从这个api获得的响应嵌入在花括号中，因为它不允许我将响应转换为Yelp模型。

她是我得到的回应。

{{“business”：[{“id”：“Xg-FyjVKAN70LO4u4Z1ozg”，“alias”：“hog-island-oyster-co-san-francisco”，“name”：“Hog Island Oyster Co”，“image_url” ：“”，“is_closed”：false，“url”：“”，“review_count”：5550，“categories”：[{“alias”：“seafood”，“title”：“Seafood”}，{“alias” ：“海鲜市场”，“标题”：“海鲜市场”}，{“别名”：“raw_food”，“标题”：“生活/生食”}，“评级”：4.5，“坐标”：{“纬度“：37.795831，”经度“：-122.393303}，”交易“：[]，”价格“：”$$“，”位置“：{”address1“：”1 Ferry Bldg“，”address2“：”“， “address3”：“Shop 11”，“city”：“旧金山”，“zip_code”：“94111”，“country”：“US”，“state”：“CA”，“display_address”：[“1 Ferry Bldg“，”Shop 11“，”San Francisco，CA 94111“]}，”phone“：”+ 14153917117“，”display_phone“：”[phone]“，”distance“：1154.8167382059307}，{”id “：”PsY5DMHxa5iNX_nX0T-qPA“，”别名“：”kokkari-estiatorio-san-francisco“，”name“：”Kokkari Estiatorio“，”image_url“：”“，”is_closed“：false，”url“：”“ ，“review_count”：430 0，“类别”：[{“alias”：“greek”，“title”：“Greek”}，{“alias”：“mediterranean”，“title”：“Mediterranean”}]，“rating”：4.5， “coordinates”：{“latitude”：37.796996，“经度”：-122.399661}，“transactions”：[“pickup”]，“price”：“$$$”，“location”：{“address1”：“200 Jackson St“，”address2“：”“，”address3“：”“，”city“：”旧金山“，”zip_code“：”94111“，”country“：”US“，”state“：”CA“ ，“display_address”：[“200 Jackson St”，“San Francisco，CA 94111”]}，“phone”：“+ 14159810983”，“display_phone”：“[phone]”，“distance”：1124.9562174585888} ，{“id”：“ZoZjbOYR-apY8XvommlNUA”，“别名”：“the-house-san-francisco”，“name”：“The House”，“image_url”：“”：false，“url”：“” ，“review_count”：4521，“类别”：[]}}

在响应的开始和结束处有一对额外的花括号。如何以适当的Json格式获取响应。

Answer 1

呼唤

all.ReadAsAsync<Object>().Result;

返回一个JObject的实例，它不能通过简单转换转换为Yelp。而是像这样打电话给ReadAsAsync

var business = await all.ReadAsAsync<Common.Models.Yelp.Yelp>();
return business;

如果你仍想用object调用它，你可以这样做

var business = await all.ReadAsAsync<object>();
return ((JObject)business).ToObject<Yelp>();

注意

响应json不包含额外的花括号。它只是JObject在调试视图中添加它们。通过检查读取响应的结果作为字符串all.ReadAsStringAsync().Result来检查这一点很容易。

Answer 2

使用JSON.NET的Deserialize method使用泛型类型重载从字符串反序列化为您想要的POCO。

---

public async Task<HttpContent> InvokeApi(string path, HttpAction action, HttpContent content = null, TimeSpan? overrideTimeout = null, string externalServer = null)
{

    var sUrl = externalServer == null ? ServerUrl : externalServer;

    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri(sUrl);
        if (overrideTimeout.HasValue)
        {
            client.Timeout = overrideTimeout.Value;
        }
        //this.Log("Connecting to {0} Api at {1}".Fmt(WebPortalServer, ServerUrl));
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", AccessToken);
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        HttpResponseMessage response;

        switch (action)
        {
            case HttpAction.Get:
                response = await client.GetAsync(path);
                break;
            case HttpAction.Post:
                response = await client.PostAsync(path, content);
                break;
            case HttpAction.Put:
                response = await client.PutAsync(path, content);
                break;
            case HttpAction.Delete:
                response = await client.DeleteAsync(path);
                break;
            default:
                throw new ArgumentOutOfRangeException("action", action, null);
        }

        return response.IsSuccessStatusCode ? response.Content : null;
    }
}

public async Task<Common.Models.Yelp.Yelp> GetAllBusiness(decimal latitude, decimal longitude)
{
    HttpContent all = await _webPortalApiClient.InvokeApi($"businesses/search?limit=10&latitude={latitude}&longitude={longitude}", HttpAction.Get, null, null, "https://api.yelp.com/v3/");
    if (all == null)
    {
        return null;
    }


    string responseBody = await all.ReadAsStringAsync();

    // Deserialize from serialized string into your POCO
    var business = JsonConvert.DeserializeObject<Common.Models.Yelp.Yelp>(responseBody);
    return business;
}

Answer 3

 var business = all.Result;  
 var resultString = business.ReadAsStringAsync();  
 return JsonConvert.DeserializeObject<Common.Models.Yelp.Yelp>(resultString);