/// <summary> /// Synchronizely get the query set count from the server by executing the $count=value query /// </summary> /// <param name="context">The context</param> /// <returns>The server side count of the query set</returns> internal long GetQuerySetCount(DataServiceContext context) { Debug.Assert(null != context, "context is null"); Version requestVersion = this.QueryComponents(context.Model).Version; if (requestVersion == null) { requestVersion = Util.ODataVersion4; } QueryResult response = null; QueryComponents qc = this.QueryComponents(context.Model); Uri requestUri = qc.Uri; DataServiceRequest <long> serviceRequest = new DataServiceRequest <long>(requestUri, qc, null); HeaderCollection headers = new HeaderCollection(); // Validate and set the request DSV header headers.SetRequestVersion(requestVersion, context.MaxProtocolVersionAsVersion); context.Format.SetRequestAcceptHeaderForCount(headers); string httpMethod = XmlConstants.HttpMethodGet; ODataRequestMessageWrapper request = context.CreateODataRequestMessage( context.CreateRequestArgsAndFireBuildingRequest(httpMethod, requestUri, headers, context.HttpStack, null /*descriptor*/), null /*descriptor*/); response = new QueryResult(this, Util.ExecuteMethodName, serviceRequest, request, new RequestInfo(context), null, null); try { response.ExecuteQuery(); if (HttpStatusCode.NoContent != response.StatusCode) { StreamReader sr = new StreamReader(response.GetResponseStream()); long r = -1; try { r = XmlConvert.ToInt64(sr.ReadToEnd()); } finally { sr.Close(); } return(r); } else { throw new DataServiceQueryException(Strings.DataServiceRequest_FailGetCount, response.Failure); } } catch (InvalidOperationException ex) { QueryOperationResponse operationResponse = null; operationResponse = response.GetResponse <long>(MaterializeAtom.EmptyResults); if (null != operationResponse) { operationResponse.Error = ex; throw new DataServiceQueryException(Strings.DataServiceException_GeneralError, ex, operationResponse); } throw; } }