Using WCF Data Services (ODATA) operations in Windows Phone development

I'm developing a windows phone application that needs to consume data from an OData feed (using WCF Data Services). Specifically, I need to call the following operation

http://localhost/ODATA/PIDataService.svc/RecordedValues?path='\\OPENXC\OpenXC\EventFrames[testFrame]|Sinusoid'&startTime='*-1d'&endTime='*'

When I execute this in the browser (Chrome) it gives me the proper result

<feed xml:base="http://[redacted]/OData/PIDataService.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">
<title type="text">RecordedValues</title>
<id>http://[redacted]/ODATA/PIDataService.svc/RecordedValues</id>
<updated>2012-09-11T12:09:12Z</updated>
<link rel="self" title="RecordedValues" href="RecordedValues"/>
<entry>
<id>http://[redacted]/OData/PIDataService.svc/TimeseriesValues(SourceAttributePath='//OPENXC/OpenXC/EventFrames%5BtestFrame%5D%7CSinusoid',Timestamp=datetime'2012-09-10T13%3A31%3A09Z')</id>
<title type="text"/>
<updated>2012-09-11T12:09:12Z</updated>
<author>
<name/>
</author>
<link rel="edit" title="TimeSeriesValue" href="TimeseriesValues(SourceAttributePath='//OPENXC/OpenXC/EventFrames%5BtestFrame%5D%7CSinusoid',Timestamp=datetime'2012-09-10T13%3A31%3A09Z')"/>
<link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/UOM" type="application/atom+xml;type=entry" title="UOM" href="TimeseriesValues(SourceAttributePath='//OPENXC/OpenXC/EventFrames%5BtestFrame%5D%7CSinusoid',Timestamp=datetime'2012-09-10T13%3A31%3A09Z')/UOM"/>
<link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/SourceAttribute" type="application/atom+xml;type=entry" title="SourceAttribute" href="TimeseriesValues(SourceAttributePath='//OPENXC/OpenXC/EventFrames%5BtestFrame%5D%7CSinusoid',Timestamp=datetime'2012-09-10T13%3A31%3A09Z')/SourceAttribute"/>
<category term="vCampus.OData.Web.ObjectModel.TimeSeriesValue" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme"/>
<content type="application/xml">
<m:properties>
<d:Timestamp m:type="Edm.DateTime">2012-09-10T13:31:09Z</d:Timestamp>
<d:SourceAttributePath>\\OPENXC\OpenXC\EventFrames[testFrame]|Sinusoid</d:SourceAttributePath>
<d:Value>85.7081527709961</d:Value>
<d:UOMName m:null="true"/>
<d:AdditionalInfo/>
<d:Annotated m:type="Edm.Boolean">false</d:Annotated>
<d:IsGood m:type="Edm.Boolean">true</d:IsGood>
<d:Questionable m:type="Edm.Boolean">false</d:Questionable>
<d:Status>Good</d:Status>
<d:Substituted m:type="Edm.Boolean">false</d:Substituted>
</m:properties>
</content>
</entry>
<entry>
<id>http://[redacted]/OData/PIDataService.svc/TimeseriesValues(SourceAttributePath='//OPENXC/OpenXC/EventFrames%5BtestFrame%5D%7CSinusoid',Timestamp=datetime'2012-09-10T14%3A40%3A09Z')</id>
<title type="text"/>
<updated>2012-09-11T12:09:12Z</updated>
<author>
<name/>
</author>
<link rel="edit" title="TimeSeriesValue" href="TimeseriesValues(SourceAttributePath='//OPENXC/OpenXC/EventFrames%5BtestFrame%5D%7CSinusoid',Timestamp=datetime'2012-09-10T14%3A40%3A09Z')"/>
<link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/UOM" type="application/atom+xml;type=entry" title="UOM" href="TimeseriesValues(SourceAttributePath='//OPENXC/OpenXC/EventFrames%5BtestFrame%5D%7CSinusoid',Timestamp=datetime'2012-09-10T14%3A40%3A09Z')/UOM"/>
<link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/SourceAttribute" type="application/atom+xml;type=entry" title="SourceAttribute" href="TimeseriesValues(SourceAttributePath='//OPENXC/OpenXC/EventFrames%5BtestFrame%5D%7CSinusoid',Timestamp=datetime'2012-09-10T14%3A40%3A09Z')/SourceAttribute"/>
<category term="vCampus.OData.Web.ObjectModel.TimeSeriesValue" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme"/>
<content type="application/xml">
<m:properties>
<d:Timestamp m:type="Edm.DateTime">2012-09-10T14:40:09Z</d:Timestamp>
<d:SourceAttributePath>\\OPENXC\OpenXC\EventFrames[testFrame]|Sinusoid</d:SourceAttributePath>
<d:Value>99.2516555786133</d:Value>
<d:UOMName m:null="true"/>
<d:AdditionalInfo/>
<d:Annotated m:type="Edm.Boolean">false</d:Annotated>
<d:IsGood m:type="Edm.Boolean">true</d:IsGood>
<d:Questionable m:type="Edm.Boolean">false</d:Questionable>
<d:Status>Good</d:Status>
<d:Substituted m:type="Edm.Boolean">false</d:Substituted>
</m:properties>
</content>
</entry>
...

The (Windows Phone) client code:

  var path = attr.Path;
                   var context = new DatabaseData(new Uri(MainPage.serviceUrl));

                   var query = context.CreateQuery<TimeSeriesValue>("RecordedValues")
                       .AddQueryOption("path", string.Format("'{0}'", path))
                       .AddQueryOption("startTime", "'*-1d'")
                       .AddQueryOption("endTime", "'*'");
                   query.BeginExecute(TimeSeriesReady, query);


   private void TimeSeriesReady(IAsyncResult result)
    {
        var context = result.AsyncState as DataServiceQuery<TimeSeriesValue>;
        var values = context.EndExecute(result).ToList();
        values.ForEach(v => Debug.WriteLine(v.Value));
    }

This presents me with an 'InvalidOperationException' with

An error occurred while processing this request.

The innerexception message is '0x80000012' and the stack trace is

 at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
       at MS.Internal.XcpImports.WebRequest_Send(InternalWebRequest request)
       at MS.Internal.InternalWebRequest.Send()
       at System.Net.Browser.ClientHttpWebRequest.PrepareAndSendRequest(String method, Uri requestUri, Stream requestBodyStream, WebHeaderCollection headerCollection, CookieContainer cookieContainer)
       at System.Net.Browser.ClientHttpWebRequest.BeginGetResponseImplementation()
       at System.Net.Browser.ClientHttpWebRequest.InternalBeginGetResponse(AsyncCallback callback, Object state)
       at System.Net.Browser.ClientHttpWebRequest.BeginGetResponse(AsyncCallback callback, Object state)
       at System.Data.Services.Http.ClientHttpWebRequest.BeginGetResponse(AsyncCallback callback, Object state)
       at System.Data.Services.Client.BaseAsyncResult.InvokeAsync(Func`3 asyncAction, AsyncCallback callback, Object state)
       at System.Data.Services.Client.QueryResult.BeginExecute(DataServiceContext context)
       at System.Data.Services.Client.DataServiceRequest.BeginExecute(Object source, DataServiceContext context, AsyncCallback callback, Object state)
       at System.Data.Services.Client.DataServiceQuery`1.BeginExecute(AsyncCallback callback, Object state)
       at vCampus.OData.Phone.DetailsPage.eventFrames_LoadCompleted(Object sender, LoadCompletedEventArgs e)
       at System.Data.Services.Client.DataServiceCollection`1.<>c__DisplayClass11.<>c__DisplayClass13.<BeginLoadAsyncOperation>b__f()
       at System.Reflection.RuntimeMethodInfo.InternalInvoke(RuntimeMethodInfo rtmi, Object obj, BindingFlags invokeAttr, Binder binder, Object parameters, CultureInfo culture, Boolean isBinderDefault, Assembly caller, Boolean verifyAccess, StackCrawlMark& stackMark)
       at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, StackCrawlMark& stackMark)
       at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
       at System.Delegate.DynamicInvokeOne(Object[] args)
       at System.MulticastDelegate.DynamicInvokeImpl(Object[] args)
       at System.Delegate.DynamicInvoke(Object[] args)
       at System.Windows.Threading.DispatcherOperation.Invoke()
       at System.Windows.Threading.Dispatcher.Dispatch(DispatcherPriority priority)
       at System.Windows.Threading.Dispatcher.OnInvoke(Object context)
       at System.Windows.Hosting.CallbackCookie.Invoke(Object[] args)
       at System.Windows.Hosting.DelegateWrapper.InternalInvoke(Object[] args)
       at System.Windows.RuntimeHost.ManagedHost.InvokeDelegate(IntPtr pHandle, Int32 nParamCount, ScriptParam[] pParams, ScriptParam& pResult)

I have searched for this error code, but could not find any answers. Code samples available online suggest this approach, but give no explanation for this error.

As Vitek suggested, Uri.EscapeUriString needs to be used to escape the path query option:

var path = attr.Path;
var context = new DatabaseData(new Uri(MainPage.serviceUrl));
var query = context.CreateQuery<TimeSeriesValue>("RecordedValues")
                .AddQueryOption("path", string.Format("'{0}'", Uri.EscapeUriString(path)))
                .AddQueryOption("startTime", "'*-1d'")
                .AddQueryOption("endTime", "'*'");
query.BeginExecute(TimeSeriesReady, query);

One of our devs tested and verified on both our existing Windows Phone client bits as well as our upcoming Windows Phone client bits.