Question

我需要获取从Json反序列化的对象列表。

我的问题是这个代码在行responseMessage = await httpClient.GetAsync(uri);中挂起我在Fiddler中检查了get和响应，我在Fiddler中获取Json，一切都有200代码，但由于某种原因代码不能继续下一步虽然在VS中进行调配，但它只会永远挂起。我在这段代码中缺少什么来获取对象列表？

由于代码在提到的行中挂起，因此问题必须在HttpClient中。

using (HttpClient httpClient = new HttpClient())
            {
                try
                {
                    var headers = httpClient.DefaultRequestHeaders;

                    HttpResponseMessage responseMessage;

                    responseMessage = await httpClient.GetAsync(uri);
                    responseMessage.Content.Headers.ContentType = new HttpMediaTypeHeaderValue("application/x-www-form-urlencoded; charset=UTF-8");

                    var content = responseMessage.Content.ReadAsStringAsync();


                    tvChannelList = JsonConvert.DeserializeObject<List<TvChannels>>(content.GetResults());

                    return tvChannelList;
                }
                catch (Exception ex)
                {
                    throw;
                }
            }

提前感谢任何提示。

Answer 1

问题是如此悲惨，我忘了将await放在从Web服务调用数据的方法名称之前，从而阻止UI。

前

ListOfTvChannels = _remoteController.GetChannelListAsync();

后

ListOfTvChannels = await _remoteController.GetChannelListAsync();

感谢所有人的帮助。

Answer 2

I use this method when using the HttpClient and want to return an object from a JSON response.

    public async Task<TResult> MakeGetRequest<TResult>(string uri)
    {
        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            client.DefaultRequestHeaders.TryAddWithoutValidation("Accept-Encoding", "gzip, deflate");
            client.DefaultRequestHeaders.TryAddWithoutValidation("Accept-Charset", "ISO-8859-1");

            HttpResponseMessage response = await client.GetAsync(uri);
            response.EnsureSuccessStatusCode();
            var data = await response.Content.ReadAsStringAsync();
            return JsonConvert.DeserializeObject<TResult>(data);
        }
    }

如何使用Windows.Web.HttpClient获取数据反序列化？

2 个答案: