HttpWebRequest 和 HttpWebResponse 显示旧数据 [英] HttpWebRequest and HttpWebResponse shows old data

问题描述

更新数据后，当webservice被调用时，它仍然获取旧数据.仅当我注销应用程序然后再次登录时才会加载新数据.

After updating the data, when the webservice is called, it still fetches old data. New data is loaded only when I logout of the app and then login again.

protected async override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
    {
            base.OnNavigatedTo(e);
            parameterValue = this.NavigationContext.QueryString["parameter"];

            Uri UserDetailUrl = new Uri(Constants.WebService.ws_single_user + "?user_id=" + parameterValue);
            HttpWebRequest UserDetailRequest = (HttpWebRequest)HttpWebRequest.Create(UserDetailUrl);
            HttpWebResponse UserDetailResponse = (HttpWebResponse)await UserDetailRequest.GetResponseAsync();
            StreamReader reader = new StreamReader(UserDetailResponse.GetResponseStream());
            string UserDetailString = reader.ReadToEnd();
            reader.Close();
            XDocument XUserDetailDoc = XDocument.Load(new StringReader(UserDetailString));
            if (((XElement)XUserDetailDoc.Element("main")).Element("result").Value == "success")
            {
                txtEmail.Text = ((XElement)XUserDetailDoc.Element("main")).Element("user").Element("email").Value;
                txtFirstName.Text = ((XElement)XUserDetailDoc.Element("main")).Element("user").Element("fname").Value;
                txtLastName.Text = ((XElement)XUserDetailDoc.Element("main")).Element("user").Element("lname").Value;
                txtMobile.Text = ((XElement)XUserDetailDoc.Element("main")).Element("user").Element("mobile").Value;
            }
    }

Windows 8 Phone 应用程序 - 使用 C# 和 XAML

Windows 8 Phone App - using C# and XAML

GetResponseAsync 如下:

The GetResponseAsync is as follows:

  public static Task<HttpWebResponse> GetResponseAsync(this HttpWebRequest request)
    {
        var taskComplete = new TaskCompletionSource<HttpWebResponse>();
        request.BeginGetResponse(asyncResponse =>
        {
            try
            {
                HttpWebRequest responseRequest = (HttpWebRequest)asyncResponse.AsyncState;
                HttpWebResponse someResponse = (HttpWebResponse)responseRequest.EndGetResponse(asyncResponse);
                taskComplete.TrySetResult(someResponse);
            }
            catch (WebException webExc)
            {
                HttpWebResponse failedResponse = (HttpWebResponse)webExc.Response;
                taskComplete.TrySetResult(failedResponse);
            }
        }, request);
        return taskComplete.Task;

推荐答案

我面临同样的问题，我通过在我的服务器端添加响应头来解决这个问题..

I am facing same problem, and i solved by add response header in my server side like this..

response.setHeader("Cache-Control", "no-cache");

也许这也能帮到你.

这篇关于HttpWebRequest 和 HttpWebResponse 显示旧数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！