/// <summary>
/// Creates the result object for the specified query parameters.
/// </summary>
/// <param name="source">The source object for the request.</param>
/// <param name="context">The data service context.</param>
/// <param name="callback">The AsyncCallback delegate.</param>
/// <param name="state">The state object for the callback.</param>
/// <param name="method">async method name at the source.</param>
/// <returns>Result representing the create request. The request has not been initiated yet.</returns>
private QueryResult CreateExecuteResult(object source, DataServiceContext context, AsyncCallback callback, object state, string method)
{
Debug.Assert(null != context, "context is null");
QueryComponents qc = this.QueryComponents(context.Model);
RequestInfo requestInfo = new RequestInfo(context);
Debug.Assert(
string.CompareOrdinal(XmlConstants.HttpMethodPost, qc.HttpMethod) == 0 ||
string.CompareOrdinal(XmlConstants.HttpMethodGet, qc.HttpMethod) == 0,
"Only get and post are supported in the execute pipeline, which should have been caught earlier");
if (qc.UriOperationParameters != null)
{
Debug.Assert(qc.UriOperationParameters.Any(), "qc.UriOperationParameters.Any()");
Serializer serializer = new Serializer(requestInfo);
this.RequestUri = serializer.WriteUriOperationParametersToUri(this.RequestUri, qc.UriOperationParameters);
}
HeaderCollection headers = new HeaderCollection();
if (string.CompareOrdinal(XmlConstants.HttpMethodPost, qc.HttpMethod) == 0)
{
if (qc.BodyOperationParameters == null)
{
// set the content length to be 0 if there are no operation parameters.
headers.SetHeader(XmlConstants.HttpContentLength, "0");
}
else
{
context.Format.SetRequestContentTypeForOperationParameters(headers);
}
}
// Validate and set the request DSV and MDSV header
headers.SetRequestVersion(qc.Version, requestInfo.MaxProtocolVersionAsVersion);
requestInfo.Format.SetRequestAcceptHeaderForQuery(headers, qc);
// We currently do not have a descriptor to expose to the user for invoking something through Execute. Ideally we could expose an OperationDescriptor.
ODataRequestMessageWrapper requestMessage = new RequestInfo(context).WriteHelper.CreateRequestMessage(context.CreateRequestArgsAndFireBuildingRequest(qc.HttpMethod, this.RequestUri, headers, context.HttpStack, null /*descriptor*/));
requestMessage.FireSendingRequest2(null /*descriptor*/);
QueryResult queryResult = null;
if (qc.BodyOperationParameters != null)
{
Debug.Assert(
string.CompareOrdinal(XmlConstants.HttpMethodPost, qc.HttpMethod) == 0,
"qc.HttpMethod == XmlConstants.HttpMethodPost");
Debug.Assert(qc.BodyOperationParameters.Any(), "unexpected body operation parameter count of zero.");
Serializer serializer = new Serializer(requestInfo);
serializer.WriteBodyOperationParameters(qc.BodyOperationParameters, requestMessage);
// pass in the request stream so that request payload can be written to the http webrequest.
queryResult = new QueryResult(source, method, this, requestMessage, requestInfo, callback, state, requestMessage.CachedRequestStream);
}
else
{
queryResult = new QueryResult(source, method, this, requestMessage, requestInfo, callback, state);
}
return(queryResult);
}
/// <summary>
/// Fire SendingRequest event if its conditions are met.
/// If the user has a handler for BuildingRequest, we will throw.
/// If the user has no BuildingRequest handlers but does have a SendingRequest2 handler, we silently do not fire this event (this is shipped 5.0 behavior).
/// </summary>
private void FireSendingRequest()
{
// Do not fire SendingRequest event when user tries to wrap the HttpWebRequestMessage
if (this.fireSendingRequestMethodCalled || this.requestInfo == null)
{
return;
}
// We need to set this before SendingRequest event is fired so that
// GetStream method can throw if it is called from SendingRequest event.
this.fireSendingRequestMethodCalled = true;
HeaderCollection cachedHeaders = null;
if (this.requestInfo.HasSendingRequestEventHandlers)
{
// Before firing SendingRequest event, we need to cache all the header values so that
// we can reset them to the original values after SendingRequest event has been fired.
cachedHeaders = new HeaderCollection();
foreach (var header in this.Headers)
{
cachedHeaders.SetHeader(header.Key, header.Value);
}
#if PORTABLELIB
cachedHeaders.SetHeader(XmlConstants.HttpContentLength, this.httpRequest.Headers[XmlConstants.HttpContentLength]);
#endif
#if !ASTORIA_LIGHT && !PORTABLELIB
// Content-Length and accept header does not show up in the header collection at all.
// Hence adding it explicitly, since we reset the content length header
// after firing SendingRequest event
cachedHeaders.SetHeader(XmlConstants.HttpContentLength, this.httpRequest.ContentLength.ToString(CultureInfo.InvariantCulture));
#endif
}
// Fires whenever a new HttpWebRequest has been created
// The event fires early - before the client library sets many of its required property values.
// This ensures the client library has the last say on the value of mandated properties
// such as the HTTP verb being used for the request.
if (this.requestInfo.HasSendingRequestEventHandlers)
{
System.Net.WebHeaderCollection requestHeaders;
#if !ASTORIA_LIGHT
requestHeaders = this.httpRequest.Headers;
SendingRequestEventArgs args = new SendingRequestEventArgs(this.httpRequest, requestHeaders);
#else
requestHeaders = this.httpRequest.CreateEmptyWebHeaderCollection();
/* Also set header for SL, MaxDataServcieVersion is required header */
foreach (var head in this.Headers)
{
if (head.Key == XmlConstants.HttpMaxDataServiceVersion)
{
requestHeaders[XmlConstants.HttpMaxDataServiceVersion] = head.Value;
break;
}
}
SendingRequestEventArgs args = new SendingRequestEventArgs(null, requestHeaders);
#endif
this.requestInfo.FireSendingRequest(args);
#if !ASTORIA_LIGHT
if (!Object.ReferenceEquals(args.Request, this.httpRequest))
{
this.httpRequest = (System.Net.HttpWebRequest)args.Request;
}
#else
// apply all headers to the request
foreach (string key in requestHeaders.AllKeys)
{
this.httpRequest.Headers[key] = requestHeaders[key];
}
#endif
HttpWebRequestMessage.SetHeaderValues(this, cachedHeaders, this.Method);
}
}
