windows-phone-7 - Windows Phone 開発での WCF Data Services (ODATA) 操作の使用

Question

OData フィードからのデータを使用する必要がある Windows Phone アプリケーションを開発しています (WCF Data Services を使用)。具体的には、次の操作を呼び出す必要があります

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

これをブラウザ（Chrome）で実行すると、適切な結果が得られます

<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>
...

(Windows Phone) クライアントコード:

  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));
    }

これにより、「InvalidOperationException」が表示されます

このリクエストの処理中にエラーが発生しました。

内部例外メッセージは「0x80000012」で、スタックトレースは

 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)

このエラーコードを検索しましたが、答えが見つかりませんでした。オンラインで入手できるコードサンプルは、このアプローチを示唆していますが、このエラーの説明はありません。

score 0 · Accepted Answer

Vitek が提案したように、クエリオプションUri.EscapeUriStringをエスケープするために使用する必要があります。path

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);

当社の開発者の 1 人が、既存の Windows Phone クライアントビットと今後の Windows Phone クライアントビットの両方でテストおよび検証を行いました。

windows-phone-7 - Windows Phone 開発での WCF Data Services (ODATA) 操作の使用

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