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我想在我的应用程序和akavache/Akavache中使用paulcbetts/refit。

问题是根据我的逻辑，Windows Phone 不喜欢我执行以下操作：

我得到学期（从缓存中，然后获取），选择想要的学期（我将 H2014 用于测试），获取所选（许多）学期的时间表（从缓存中，然后获取，如下所示：

var defer = Observable.Defer(() =>
    BlobCache.Secure.GetAndFetchLatest("Semesters", () => _api.GetSemesters())
        .Select(x => x.Single(semester => semester.AbredgedName == "H2014"))
        .SelectMany(currentSemester => BlobCache.Secure.GetAndFetchLatest("Schedule_" + currentSemester.AbredgedName,
            () => _api.GetSchedule(currentSemester.AbredgedName)))
        );

defer.Subscribe(scheduleVms => {
    foreach (var activity in scheduleVms)
    {
        Debug.WriteLine("1 {0}", activity.Name);
    }
});

Observable.Timer(TimeSpan.FromSeconds(4)).Subscribe(_ =>
{
    defer.Subscribe(scheduleVms => {
        foreach (var activity in scheduleVms)
        {
            Debug.WriteLine("2 {0}", activity.Name);
        }
    });
});

如果我使用 5 或更多的 TimeSpan.FromSeconds，它会做我想做的事，就好像我给了 Windows Phone 喘息的时间。否则（5岁以下），我得到的例外情况如下：

抛出异常：mscorlib.ni.dll StackTrace 中的“System.NotSupportedException”：

at MS.Internal.Modern.InternalNetworkStream.BeginRead(Byte[] buffer, Int32 offset, Int32 count, AsyncCallback callback, Object state)
at System.IO.Stream.<BeginEndReadAsync>b__d(Stream stream, ReadWriteParameters args, AsyncCallback callback, Object state)
at System.Threading.Tasks.TaskFactory`1.FromAsyncTrim[TInstance,TArgs](TInstance thisRef, TArgs args, Func`5 beginMethod, Func`3 endMethod)
at System.IO.Stream.BeginEndReadAsync(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.Stream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at System.Net.Http.DelegatingStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at System.Net.Http.DelegatingStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at System.IO.Stream.<CopyToAsyncInternal>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Refit.RequestBuilderImplementation.<>c__DisplayClass2a`1.<<buildCancellableTaskFuncForMethod>b__29>d__2c.MoveNext()

想要的行为：

  1. 获取缓存学期 -> 获取该学期的缓存计划，获取该学期的计划
  2. 获取学期 -> 获取该学期的缓存计划，获取该学期的计划

我试过了：

  • 在没有 Refit 的情况下链接akavache/Akavache并且它可以工作。
  • 在没有akavache/Akavache的情况下链接 GetSchedule 和 GetSemesters 的选择，它可以工作。

如果你们对工作有想法或我做错了什么，请告诉我！

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