c# - 使用 WebClient 的 wp7 REST 服务调用超时异常

Question

编辑:我很乐意放弃这个问题的赏金 - 时间快到了 - 下面的所有评论都是最新的，但仍然没有解决。

出现奇怪的错误。我已将我的代码简化为绝对最简单的形式，但对于以下代码仍然出现错误。

    public partial class MainPage : PhoneApplicationPage {
    private readonly WebClient webClient;

    public MainPage() {
        InitializeComponent();

        webClient = new WebClient();
        webClient.OpenReadCompleted += clientOpenRead_Completed;
    }

    private void LoadButton_Click(object sender, RoutedEventArgs e) {
        webClient.OpenReadAsync(new Uri(@"validURL"));
    }

    private void clientOpenRead_Completed(object sender, System.Net.OpenReadCompletedEventArgs e) {
        using (var sr = new StreamReader(e.Result)) {
            Result.Text = sr.ReadToEnd();
        }
    }  
}

sr.ReadToEnd();总是返回空字符串，当我从 clientOpenRead_Completed 检查“e.Result”时，它包含以下异常:

base    {"Timeouts are not supported on this stream."}  System.SystemException {System.InvalidOperationException}

其他重要验证:validURL 在浏览器请求时起作用。此外，上述代码在控制台应用程序中调用时工作正常，同样的 URL 和类似代码在 Monodroid 中也工作正常。

最后，服务源非 WCF。

有什么想法吗？

谢谢。

编辑:我正在检查 e.Result 时的堆栈跟踪:(来自一个略有不同但有相同问题的项目)

>   AppTest.dll!AppTest.Data.AsyncServiceProvider.clientOpenRead_Completed(object sender, System.Net.OpenReadCompletedEventArgs e) Line 20  C#
System.Net.dll!System.Net.WebClient.OnOpenReadCompleted(System.Net.OpenReadCompletedEventArgs e) + 0x15 bytes   
System.Net.dll!System.Net.WebClient.OpenReadOperationCompleted(object arg) + 0xc bytes  
mscorlib.dll!System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo rtmi, object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, object parameters, System.Globalization.CultureInfo culture, bool isBinderDefault, System.Reflection.Assembly caller, bool verifyAccess, ref System.Threading.StackCrawlMark stackMark)   
mscorlib.dll!System.Reflection.RuntimeMethodInfo.InternalInvoke(object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, object[] parameters, System.Globalization.CultureInfo culture, ref System.Threading.StackCrawlMark stackMark) + 0x168 bytes 
mscorlib.dll!System.Reflection.MethodBase.Invoke(object obj, object[] parameters) + 0xa bytes   
mscorlib.dll!System.Delegate.DynamicInvokeOne(object[] args) + 0x98 bytes   
mscorlib.dll!System.MulticastDelegate.DynamicInvokeImpl(object[] args) + 0x8 bytes  
mscorlib.dll!System.Delegate.DynamicInvoke(object[] args) + 0x2 bytes   
System.Windows.dll!System.Windows.Threading.DispatcherOperation.Invoke() + 0xc bytes    
System.Windows.dll!System.Windows.Threading.Dispatcher.Dispatch(System.Windows.Threading.DispatcherPriority priority) + 0x83 bytes  
System.Windows.dll!System.Windows.Threading.Dispatcher.OnInvoke(object context) + 0x8 bytes 
System.Windows.dll!System.Windows.Hosting.CallbackCookie.Invoke(object[] args) + 0x19 bytes 
System.Windows.dll!System.Windows.Hosting.DelegateWrapper.InternalInvoke(object[] args) + 0x2 bytes 
System.Windows.RuntimeHost.dll!System.Windows.RuntimeHost.ManagedHost.InvokeDelegate(System.IntPtr pHandle, int nParamCount, System.Windows.Hosting.NativeMethods.ScriptParam[] pParams, ref System.Windows.Hosting.NativeMethods.ScriptParam pResult) + 0x5e bytes 
[External Code] 

Answer 1

也许试试:webClient.DownloadStringAsync(yourUrl);

代替

webClient.OpenReadAsync(yourUrl);