Google Drive SDK fetch causes unhandled exception

Question

I'm trying to handle network failure exceptions when using Google Drive SDK and I have the following problem. I'm disconnecting my network and running this code

try
{
    FilesResource.InsertRequest r = service_.Files.Insert(body);
    r.Fetch();
} catch
{
    Console.WriteLine("Error");
}

but instead of printing "Error" the application is terminated due to unhandled exception. Debugger shows the following stack trace

Unable to connect to the remote server
   at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
   at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult)
   at Google.Apis.Requests.Request.EndAttachBody(IAsyncResult asyncResult) in c:\code.google.com\google-api-dotnet-client\default_release\Tools\BuildRelease\bin\Debug\output\default\Src\GoogleApis\Apis\Requests\Request.cs:line 714
   at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
   at System.Net.ContextAwareResult.CompleteCallback(Object state)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Net.ContextAwareResult.Complete(IntPtr userToken)
   at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
   at System.Net.HttpWebRequest.SetResponse(Exception E)
   at System.Net.HttpWebRequest.SetAndOrProcessResponse(Object responseOrException)
   at System.Net.ConnectionReturnResult.SetResponses(ConnectionReturnResult returnResult)

Looks like Fetch() does some asynchronous operations inside and the exception is not handled. So I can't find a way handling this exception. It always terminates my application. How can I fix that?

update

I found this line of code

Stream bodyStream = request.EndGetRequestStream(asyncResult);

in Src\GoogleApis.Tests\Apis\Requests\RequestTest.cs:731

EndGetRequestStream throws an exception which is unhandled by the thread, so it looks like this is a bug in Client API. Am I right? Any workarounds?

update

Any answers? That's very important. My application crashes every time I disconnect the network and this cannot be solved without touching Google API source codes. I changed BeginGetResponse() to GetResponse() and recompiled the code, so currently it works for me and Fetch() throws an exception as expected, but synchronous and asynchronous operations are sharing a common code (synchronous operation executes asynchronous and waits) so currently I can't do async fetch. Will you guys fix this?

update

Google says We support the Google Drive SDK on Stack Overflow. Guys, do you really provide kind of support for your SDK? I'm waiting for ANY answer almost 5 days. Is there anybody?

Answer 1

Sorry for the delay. It looks like a bug and I just opened a new issue in our issue tracker - you can add more details to it here. We will try to fix it in the next release.

Answer 2

In the next couple of weeks we are going to publish version 1.4.0-beta which has a fix for this problem. Just to let you know, the new version of Google.Apis core library will be PCL. It requires upgrading the .NET framework to 4.0, and there is a great usage of TPL.