Question

我有这段代码从WP8的API获取JSON数据：

HttpClient client = new HttpClient();
client.BaseAddress = new Uri(mainURL.ToString());
HttpResponseMessage response = await client.GetAsync("");
string res = await response.Content.ReadAsStringAsync();
var root = await JsonConvert.DeserializeObjectAsync<Rootobject>(res);

一切都运行良好，但是当我从网站更新Web API上的数据并尝试使用此代码再次检索数据时，即使在浏览器中访问URL，它也会获取新数据。

当我逐行调试时，我看到“response”对象包含旧数据。

我找到解决此问题的唯一方法是以这种方式重建项目。

如何正确获取更新数据？

Answer 1

我有同样的问题。我试过这可能对你有帮助。

HttpWebRequest request = HttpWebRequest.CreateHttp(mainURL.ToString());
     request.Method = "GET or Post";
     request.BeginGetResponse(ResponseCallBack, request);


    void ResponseCallBack(IAsyncResult asyncResult)
     {
     HttpWebRequest request = (HttpWebRequest)asyncResult.AsyncState;
                    HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asyncResult);
                   using (Stream data = response.GetResponseStream())
                            {
                                using (var reader = new StreamReader(data))
                                {
                                    string jsonString = reader.ReadToEnd();
                                    MemoryStream memoryStream = new MemoryStream(Encoding.Unicode.GetBytes(jsonString));
                                    DataContractJsonSerializer dataContractJsonSerializer = new DataContractJsonSerializer(typeof(Rootobject));
                                    Rootobject yourdata= dataContractJsonSerializer.ReadObject(memoryStream) as Rootobject;

                                }
                            }
     }

Answer 2

可能涉及一些缓存。尝试在URL中添加一些随机字符串，例如

client.BaseAddress = new Uri(mainURL.ToString()+"&random="+DateTime.Now.Ticks);

更新WP8后，HttpClient不会获取数据

2 个答案: