Question

我正在尝试阅读Yelp API。下面是我的代码。

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;
    }

我从此api获得的响应嵌入在花括号中，因此不允许将响应转换为Yelp模型。

她是我得到的答复。

{{“企业”：[{“ id”：“ Xg-FyjVKAN70LO4u4Z1ozg”，“ alias”：“ hog-island-oyster-co-san-francisco”，“名称”：“ Hog Island Oyster Co”， “ image_url”：“”，“ is_closed”：否，“ url”：“”，“ review_count”：5550，“类别”：[{“ alias”：“ seafood”，“ title”：“ Seafood”}，{ “ alias”：“ seafoodmarkets”，“ title”：“海鲜市场”}，{“ alias”：“ raw_food”，“ title”：“生/生食物”}]，“等级”：4.5，“坐标”： {“纬度”：37.795831，“经度”：-122.393303}，“交易”：[]，“价格”：“ $$”，“位置”：{“ address1”：“ 1 Ferry Bldg”，“ address2”： “”，“ address3”：“商店11”，“城市”：“旧金山”，“邮政编码”：“ 94111”，“国家”：“美国”，“州”：“ CA”，“ display_address”：[ “ 1 Ferry Bldg”，“ Shop 11”，“ San Francisco，CA 94111” ]}，“ phone”：“ +14153917117”，“ display_phone”：“（415）391-7117”，“ distance”：1154.8167382059307}，{“ id”：“ PsY5DMHxa5iNX_nX0T-qPA”，“ alias”：“ kokkari- estiatorio-san-francisco”，“名称”：“ Kokkari Estiatorio”，“ image_url”：“”，“ is_closed”：false，“ url”：“”，“ review_count”：4300，“类别”：[{ “：” greek“，” title“：”希腊“}，{” alias“：” mediterranean“，” title“：” Mediterranean“}]，”等级“：4.5，”坐标“：{”纬度“：37.796996 ，“经度”：-122.399661}，“交易”：[“提取”]，“价格”：“ $$$”，“位置”：{“ address1”：“ 200 Jackson St”，“ address2”：“” ，“ address3”：“”，“ city”：“旧金山”，“邮政编码”：“ 94111”，“国家”：“美国”，“州”：“ CA”，“ display_address”：[“ Jackson Jackson 200号“， “旧金山，CA 94111“]}，” phone“：” +14159810983“，” display_phone“：”（415）981-0983“，” distance“：1124.9562174585888}，{” id“：” ZoZjbOYR-apY8XvommlNUA“，” alias“ ：“” the-house-san-francisco“，” name“：” The House“，” image_url“：”“：假，” url“：”“，” review_count“：4521，”类别“：[]}}

响应的开始和结束处有一对多余的花括号。如何获取正确的Json格式的响应。

Answer 1

的呼叫

all.ReadAsAsync<Object>().Result;

返回JObject的实例，该实例无法通过简单的强制转换转换为Yelp。而是这样叫ReadAsAsync

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

如果您仍然想用object调用它，可以这样做

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

注意

响应json不包含多余的花括号。只是JObject将它们添加到调试视图中。通过将读取响应的结果作为字符串all.ReadAsStringAsync().Result进行检查，很容易检查这一点。

Answer 2

使用通用类型重载，使用JSON.NET的Deserialize method将字符串反序列化为所需的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);

Web API响应中多余的花括号使响应变得难以处理，无法转换为模型

3 个答案: