Question

我尝试将文件上传到OneDrive。我已成功连接并验证OneDrive，但在尝试上传时，我收到错误：Object reference not set to an instance of an object.

代码是：

IsolatedStorageFile iso = IsolatedStorageFile.GetUserStoreForApplication();
// Release all resources from DB 
App.AppViewModel.DisposeCurrentDB();

IsolatedStorageFileStream toUploadStream = iso.OpenFile(AppResources.DatabaseName + ".sdf", FileMode.Open);

LiveConnectClient liveClient = new LiveConnectClient(oneDriveAuthClient.Session);

try
{
    LiveOperationResult uploadResult = await liveClient.BackgroundUploadAsync(
        oneDriveFolderId, 
        DatabaseBackupname, 
        toUploadStream.AsInputStream(),
        OverwriteOption.Overwrite);

    dynamic result = uploadResult.Result;
    MessageBox.Show("Upload successful. Uploaded to " + result.source);
}
catch (LiveConnectException ex)
{
    MessageBox.Show("Error uploading backup: " + ex.Message);
}

App.AppViewModel.RefreshCurrentDB();

BackgroundUploadAysnc方法抛出异常。 oneDriveFolderId已设置并存在于OneDrive中。 DatabaseBackupname是OneDrive中不存在的正确的新文件名。我在调试器中检查了流，这个对象不是空的并且有一个大小。

Stacktrace
   at Microsoft.Live.Operations.TailoredUploadOperation.<OnGetUploadLinkCompleted>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__4(Object state)
   at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

我将上传代码更改为：

LiveUploadOperation operation = await liveClient.CreateBackgroundUploadAsync(
    oneDriveFolderId, 
    DatabaseBackupname, 
    toUploadStream, 
    OverwriteOption.DoNotOverwrite);
await operation.StartAsync();

并且CreateBackgroundUploadAsync方法抛出以下异常：

Message = "Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"
   at Windows.Networking.BackgroundTransfer.BackgroundUploader.CreateUploadFromStreamAsync(Uri uri, IInputStream sourceStream)
   at Microsoft.Live.Operations.CreateBackgroundUploadOperation.<OnGetUploadLinkCompleted>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__4(Object state)
   at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

Answer 1

这不是错误消息的真正解决方案，但我将Live.SDK引用更改为Windows Phone dll，现在我可以使用BackgroundUploadAsync（path，uri，overwrite）方法，它可以正常工作。

我还必须更改Auth方法。

Answer 2

我在这个问题上浪费了几个小时。对我来说，它发生在我正在迁移到Windows Phone 8.1 Silverlight的Windows Phone 8.0应用程序上。最终为我解决的问题是更新到最新的Microsoft Advertising SDK for Windows Phone。我从版本6.2.960.0到8.1.50112.0。在我重建之后，我上传到OneDrive的工作开始完美。根本不确定根本原因是什么，但我想在这里分享以防万一它可以帮助任何人。

要清楚，我的项目文件来自：

<Reference Include="Microsoft.Advertising.Mobile, Version=6.2.960.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
<Reference Include="Microsoft.Advertising.Mobile.UI, Version=6.2.960.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />

到此：

<Reference Include="Microsoft.Advertising.Mobile, Version=8.1.50112.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
<Reference Include="Microsoft.Advertising.Mobile.Common, Version=8.1.50112.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
<Reference Include="Microsoft.Advertising.Mobile.UI, Version=8.1.50112.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />

Answer 3

我必须＆＃34;关联＆＃34;我的应用程序＆＃34;与商店。＆＃34;

在Visual Studio的解决方案资源管理器中右键单击项目行。

左键单击Store - ＆gt;将应用程序与商店关联

我必须以Microsoft开发人员的身份注册（并为此付费），但是一旦我这样做，我对BackgroundUploadAsync的调用返回了合理的值。

因为无论如何我带着我最终会去的方向，我想，哎呀。

BackgroundUploadAsync错误对象未设置为实例

3 个答案: