在解除WP8应用程序后，UploadAsync不起作用

问题描述

我有一个应用程序尝试将文件保存到SkyDrive即将关闭。

当我的应用程序在前台运行时，我的UploadAsync调用没有问题。

为了在我的应用程序关闭时将文件保存到SkyDrive，我像这样覆盖了OnBack按钮：

 protected override void OnBackKeyPress（CancelEventArgs e）
 {
 SaveSkydriveData（）; 
 base.OnBackKeyPress（e）; 
} 

SaveSkydriveData看起来像这样：

公共异步任务SaveSkydriveData（）
{
IsolatedStorageFile商店= IsolatedStorageFile.GetUserStoreForApplication（）;
FileStream stream = store.OpenFile（" MyData.txt"，FileMode.Create）;
StreamWriter writer = new StreamWriter（stream）;
writer.Write（" blah"）;
writer.Close（）;
stream.Close（）;

FileStream readstream = store.OpenFile（" MyData.txt"，FileMode.Open）;
readstream.Position = 0;
var result = await client.UploadAsync（" me / skydrive"，" MyData.txt"，readstream，OverwriteOption.Overwrite）;
readstream.Close（）;
}

为什么这不起作用？如果在我的应用程序仍在运行时调用，SaveSkydriveData（）将按预期工作。但它似乎不适用于上述情况。

谢谢！

解决方案

Hi, I have an app that tries to save a file to SkyDrive when it is just about the be closed.

While my app is running in the foreground, my UploadAsync call works without a problem.

In order to save the file to SkyDrive as my app closes, I overrode the OnBack button like so:

protected override void OnBackKeyPress(CancelEventArgs e)
        {
            SaveSkydriveData();
            base.OnBackKeyPress(e);
        }

And SaveSkydriveData looks something like this:

public async Task SaveSkydriveData()
        {
            IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication();
            FileStream stream = store.OpenFile("MyData.txt", FileMode.Create);
            StreamWriter writer = new StreamWriter(stream);
            writer.Write("blah");
            writer.Close();
            stream.Close();

            FileStream readstream = store.OpenFile("MyData.txt", FileMode.Open);
            readstream.Position = 0;
            var result = await client.UploadAsync("me/skydrive", "MyData.txt", readstream, OverwriteOption.Overwrite);
            readstream.Close();
        }

Why doesn't this work? SaveSkydriveData() works as expected if called while my app is still running. But it doesn't seem to work in the above scenario.

Thanks!

解决方案

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