是否可以在
Windows 8中取消HttpClient GET Web请求.我正在寻找一种解决方案来取消我的Web请求,如果用户按下页面上的键.在我的应用程序中,我使用静态类来创建Web请求.
Alos我在应用程序中使用MVVM Light和静态视图模型.
在目前的情况下,即使用户按下后退按钮,
vm保持活动状态,回叫到达并在VM中执行.
所以我正在寻找一个解决方案来取消背面的请求.
试试这个
- protected async override void OnNavigatedTo(NavigationEventArgs e)
- {
- await HttpGetRequest();
- }
- public CancellationTokenSource cts = new CancellationTokenSource();
- private async Task HttpGetRequest()
- {
- try
- {
- DateTime now = DateTime.Now;
- var httpClient = new HttpClient();
- var message = new HttpRequestMessage(HttpMethod.Get,"https://itunes.apple.com/us/RSS/toppaidapplications/limit=400/genre=6000/json");
- var response = await httpClient.SendAsync(message,cts.Token);
- System.Diagnostics.Debug.WriteLine("HTTP Get request completed. Time taken : " + (DateTime.Now - now).TotalSeconds + " seconds.");
- }
- catch (TaskCanceledException)
- {
- System.Diagnostics.Debug.WriteLine("HTTP Get request canceled.");
- }
- }
- private void btnCancel_Click(object sender,RoutedEventArgs e)
- {
- cts.Cancel();
- }
