WCF Data Services はヘッダーに基づいて応答の JSON 形式を変更するAccept:ため、これら 2 つのヘッダーは異なる結果を提供します。
Accept: application/json
Accept: application/json; odata=verbose
ただし、OData 仕様では$format=、同じことを行うクエリ パラメーターが提供されています。WCF はパラメーターを尊重しているようですが、 accept ヘッダー$format=jsonのように扱います。application/jsonしかし、詳細なJSONが必要です...
私の質問は次のとおりです。の可能な値は$format=何ですか? それを使用して詳細な JSON を指定する方法はありますか?
(accept ヘッダーを使用するようにコードを変更できることは既に知っていますが、既存のコードは $format を使用しているため、代わりにそれを変更することを好みます。)
プレリリースの WCF Data Services v5.1.0-rc2 を使用しています。
編集：
私のリクエストは次のようになります。
URL:
http://localhost:52116/Services/MusicStore.svc/Albums?$format=json&%24inlinecount=allpages&%24filter=substringof('the'%2Ctolower(Title))
リクエスト ヘッダー:
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
DataServiceVersion: 3.0
Host: localhost:52116
MaxDataServiceVersion: 3.0
MinDataServiceVersion: 3.0
Proxy-Connection: keep-alive
Referer: http://localhost:52116/
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4
X-Requested-With: XMLHttpRequest
これは、有効な JSON (非詳細) を返します。
ただし、試してみると$format=jsonverbose、WCF から HTTP 500 が取得され、これがトレース ログに記録されます。
<Exception>
<ExceptionType>System.ServiceModel.CommunicationObjectAbortedException, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
<Message>The communication object, System.ServiceModel.Channels.TransportReplyChannelAcceptor+TransportReplyChannel, cannot be used for communication because it has been Aborted.</Message>
<StackTrace>
at System.ServiceModel.Channels.CommunicationObject.ThrowIfAborted()
at System.ServiceModel.Channels.InputQueueChannel`1.EndDequeue(IAsyncResult result, TDisposable& item)
at System.ServiceModel.Channels.ReplyChannel.EndTryReceiveRequest(IAsyncResult result, RequestContext& context)
at System.ServiceModel.Dispatcher.ReplyChannelBinder.EndTryReceive(IAsyncResult result, RequestContext& requestContext)
at System.ServiceModel.Dispatcher.ErrorHandlingReceiver.EndTryReceive(IAsyncResult result, RequestContext& requestContext)
at System.ServiceModel.Dispatcher.ChannelHandler.EndTryReceive(IAsyncResult result, RequestContext& requestContext)
at System.ServiceModel.Dispatcher.ChannelHandler.AsyncMessagePump(IAsyncResult result)
at System.ServiceModel.Dispatcher.ChannelHandler.OnAsyncReceiveComplete(IAsyncResult result)
at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.ServiceModel.Diagnostics.TraceUtility.<>c__DisplayClass4.<CallbackGenerator>b__2(AsyncCallback callback, IAsyncResult result)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously, Exception exception)
at System.Runtime.InputQueue`1.AsyncQueueReader.Set(Item item)
at System.Runtime.InputQueue`1.Shutdown(Func`1 pendingExceptionGenerator)
at System.ServiceModel.Channels.InputQueueChannel`1.OnClosing()
at System.ServiceModel.Channels.CommunicationObject.Abort()
at System.ServiceModel.Dispatcher.ReplyChannelBinder.Abort()
at System.ServiceModel.Channels.ServiceChannel.OnAbort()
at System.ServiceModel.Channels.CommunicationObject.Abort()
at System.Data.Services.DelegateBodyWriter.OnWriteBodyContents(XmlDictionaryWriter writer)
at System.ServiceModel.Channels.BodyWriter.WriteBodyContents(XmlDictionaryWriter writer)
at System.ServiceModel.Channels.BodyWriterMessage.OnWriteBodyContents(XmlDictionaryWriter writer)
at System.ServiceModel.Channels.Message.OnWriteMessage(XmlDictionaryWriter writer)
at System.ServiceModel.Channels.Message.WriteMessage(XmlDictionaryWriter writer)
at System.ServiceModel.Channels.Message.WriteMessage(XmlWriter writer)
at System.ServiceModel.Channels.ByteStreamMessageEncoder.WriteMessage(Message message, Int32 maxMessageSize, BufferManager bufferManager, Int32 messageOffset)
at System.ServiceModel.Channels.WebMessageEncoderFactory.WebMessageEncoder.WriteMessage(Message message, Int32 maxMessageSize, BufferManager bufferManager, Int32 messageOffset)
at System.ServiceModel.Channels.MessageEncoder.WriteMessage(Message message, Int32 maxMessageSize, BufferManager bufferManager)
at System.ServiceModel.Channels.HttpOutput.SerializeBufferedMessage(Message message)
at System.ServiceModel.Channels.HttpOutput.Send(TimeSpan timeout)
at System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.SendReplyCore(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.SendReply(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.HttpRequestContext.OnReply(Message message, TimeSpan timeout)
at System.ServiceModel.Activation.HostedHttpContext.OnReply(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.RequestContextBase.Reply(Message message, TimeSpan timeout)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.Reply(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage9(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage8(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage6(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.Dispatch(MessageRpc& rpc, Boolean isOperationContextSet)
at System.ServiceModel.Dispatcher.ChannelHandler.DispatchAndReleasePump(RequestContext request, Boolean cleanThread, OperationContext currentOperationContext)
at System.ServiceModel.Dispatcher.ChannelHandler.HandleRequest(RequestContext request, OperationContext currentOperationContext)
at System.ServiceModel.Dispatcher.ChannelHandler.AsyncMessagePump(IAsyncResult result)
at System.ServiceModel.Dispatcher.ChannelHandler.OnAsyncReceiveComplete(IAsyncResult result)
at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.ServiceModel.Diagnostics.TraceUtility.<>c__DisplayClass4.<CallbackGenerator>b__2(AsyncCallback callback, IAsyncResult result)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously, Exception exception)
at System.Runtime.InputQueue`1.AsyncQueueReader.Set(Item item)
at System.Runtime.InputQueue`1.EnqueueAndDispatch(Item item, Boolean canDispatchOnThisThread)
at System.Runtime.InputQueue`1.EnqueueAndDispatch(T item, Action dequeuedCallback, Boolean canDispatchOnThisThread)
at System.ServiceModel.Channels.InputQueueChannel`1.EnqueueAndDispatch(TDisposable item, Action dequeuedCallback, Boolean canDispatchOnThisThread)
at System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType item, Action dequeuedCallback, Boolean canDispatchOnThisThread)
at System.ServiceModel.Channels.HttpPipeline.EnqueueMessageAsyncResult.CompleteParseAndEnqueue(IAsyncResult result)
at System.ServiceModel.Channels.HttpPipeline.EnqueueMessageAsyncResult.HandleParseIncomingMessage(IAsyncResult result)
at System.Runtime.AsyncResult.SyncContinue(IAsyncResult result)
at System.ServiceModel.Channels.HttpPipeline.EnqueueMessageAsyncResult..ctor(ReplyChannelAcceptor acceptor, Action dequeuedCallback, HttpPipeline pipeline, AsyncCallback callback, Object state)
at System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.BeginProcessInboundRequest(ReplyChannelAcceptor replyChannelAcceptor, Action dequeuedCallback, AsyncCallback callback, Object state)
at System.ServiceModel.Channels.HttpRequestContext.BeginProcessInboundRequest(ReplyChannelAcceptor replyChannelAcceptor, Action acceptorCallback, AsyncCallback callback, Object state)
at System.ServiceModel.Channels.HttpChannelListener`1.HttpContextReceivedAsyncResult`1.ProcessHttpContextAsync()
at System.ServiceModel.Channels.HttpChannelListener`1.HttpContextReceivedAsyncResult`1..ctor(HttpRequestContext requestContext, Action acceptorCallback, HttpChannelListener`1 listener, AsyncCallback callback, Object state)
at System.ServiceModel.Channels.HttpChannelListener`1.BeginHttpContextReceived(HttpRequestContext context, Action acceptorCallback, AsyncCallback callback, Object state)
at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.HandleRequest()
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state)
at System.ServiceModel.AspNetPartialTrustHelpers.PartialTrustInvoke(ContextCallback callback, Object state)
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequestWithFlow(Object state)
at System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
</StackTrace>
<ExceptionString>System.ServiceModel.CommunicationObjectAbortedException: The communication object, System.ServiceModel.Channels.TransportReplyChannelAcceptor+TransportReplyChannel, cannot be used for communication because it has been Aborted.</ExceptionString>
編集2：
OK、$format=jsonverboseHTTP500 のように見えますが、この URL は私が望むものを提供します:
http://localhost:52116/Services/MusicStore.svc/Albums?$format=application%2fjson%3bodata%3dverbose&%24inlinecount=allpages&%24filter=substringof('the'%2Ctolower(Title))
したがって、基本的には$format=application/json;odata=verboseURLエスケープされています。
素晴らしい！