コード例 #1
0
        public override void WriteStart(DataServiceODataWriterNavigationLinkArgs args)
        {
            var current = new CustomInstanceAnnotationsDescriptor {
                TypeOfAnnotatedItem = typeof(ODataNavigationLink)
            };

            writtenItemsStack.Push(current);
            base.WriteStart(args);
        }
コード例 #2
0
            public override void WriteEnd(DataServiceODataWriterNavigationLinkArgs args)
            {
                if (WriteLinkEnd.Value != null)
                {
                    if (WriteLinkEnd.Value(args))
                    {
                        return;
                    }
                }

                base.WriteEnd(args);
            }
コード例 #3
0
        private void WriteNavigationProperties(IExpandedResult expanded, EntityToSerialize entityToSerialize, bool resourceInstanceInFeed, IEnumerable <ProjectionNode> projectionNodesForCurrentResourceType)
        {
            Debug.Assert(entityToSerialize != null, "entityToSerialize != null");
            Debug.Assert(
                projectionNodesForCurrentResourceType == null ||
                projectionNodesForCurrentResourceType.All(projectionNode => projectionNode.TargetResourceType.IsAssignableFrom(entityToSerialize.ResourceType)),
                "The projection nodes must be filtered to the current resource type only.");

            IEnumerable <ResourceProperty> navProperties =
                projectionNodesForCurrentResourceType == null
                ? this.Provider.GetResourceSerializableProperties(this.CurrentContainer, entityToSerialize.ResourceType).Where(p => p.TypeKind == ResourceTypeKind.EntityType)
                : projectionNodesForCurrentResourceType.Where(p => p.Property != null && p.Property.TypeKind == ResourceTypeKind.EntityType).Select(p1 => p1.Property);

            foreach (ResourceProperty property in navProperties)
            {
                ResourcePropertyInfo navProperty = this.GetNavigationPropertyInfo(expanded, entityToSerialize.Entity, entityToSerialize.ResourceType, property);
                ODataNavigationLink  navLink     = this.GetNavigationLink(entityToSerialize, navProperty.Property);

                // WCF Data Services show performance degradation with JsonLight when entities have > 25 Navgations on writing entries
                // DEVNOTE: for performance reasons, if the link has no content due to the metadata level, and is not expanded
                // then don't tell ODataLib about it at all.
                if (navLink.Url == null && navLink.AssociationLinkUrl == null && !navProperty.Expand)
                {
                    continue;
                }

                var linkArgs = new DataServiceODataWriterNavigationLinkArgs(navLink, this.Service.OperationContext);
                this.dataServicesODataWriter.WriteStart(linkArgs);

                if (navProperty.Expand)
                {
                    object          navPropertyValue          = navProperty.Value;
                    IExpandedResult navPropertyExpandedResult = navPropertyValue as IExpandedResult;
                    object          expandedPropertyValue     =
                        navPropertyExpandedResult != null?
                        GetExpandedElement(navPropertyExpandedResult) :
                            navPropertyValue;

                    bool needPop = this.PushSegmentForProperty(navProperty.Property, entityToSerialize.ResourceType, navProperty.ExpandedNode);

                    // if this.CurrentContainer is null, the target set of the navigation property is hidden.
                    if (this.CurrentContainer != null)
                    {
                        if (navProperty.Property.Kind == ResourcePropertyKind.ResourceSetReference)
                        {
                            IEnumerable enumerable;
                            bool        collection = WebUtil.IsElementIEnumerable(expandedPropertyValue, out enumerable);
                            Debug.Assert(collection, "metadata loading must have ensured that navigation set properties must implement IEnumerable");

                            QueryResultInfo queryResults = new QueryResultInfo(enumerable);
                            try
                            {
                                queryResults.MoveNext();
                                Func <Uri> getNavPropertyRelativeUri = () => RequestUriProcessor.AppendUnescapedSegment(entityToSerialize.SerializedKey.RelativeEditLink, navLink.Name);
                                Func <Uri> getNavPropertyAbsoluteUri = () => RequestUriProcessor.AppendUnescapedSegment(entityToSerialize.SerializedKey.AbsoluteEditLink, navLink.Name);
                                this.WriteFeedElements(navPropertyExpandedResult, queryResults, navProperty.Property.ResourceType, navLink.Name, getNavPropertyRelativeUri, getNavPropertyAbsoluteUri, false);
                            }
                            finally
                            {
                                // After the navigation property is completely serialized, dispose the property value.
                                WebUtil.Dispose(queryResults);
                            }
                        }
                        else if (WebUtil.IsNullValue(expandedPropertyValue))
                        {
                            // Write a null reference navigation property
                            var entryArgs = new DataServiceODataWriterEntryArgs(null, null, this.Service.OperationContext);
                            this.dataServicesODataWriter.WriteStart(entryArgs);
                            this.dataServicesODataWriter.WriteEnd(entryArgs);
                        }
                        else
                        {
                            this.WriteEntry(navPropertyExpandedResult, expandedPropertyValue, resourceInstanceInFeed, navProperty.Property.ResourceType);
                        }
                    }

                    this.PopSegmentName(needPop);
                }

                this.dataServicesODataWriter.WriteEnd(linkArgs); // end of navigation property
            }
        }
コード例 #4
0
        private void WriteNavigationProperties(IExpandedResult expanded, EntityToSerialize entityToSerialize, bool resourceInstanceInFeed, IEnumerable<ProjectionNode> projectionNodesForCurrentResourceType)
        {
            Debug.Assert(entityToSerialize != null, "entityToSerialize != null");
            Debug.Assert(
                projectionNodesForCurrentResourceType == null ||
                projectionNodesForCurrentResourceType.All(projectionNode => projectionNode.TargetResourceType.IsAssignableFrom(entityToSerialize.ResourceType)),
                "The projection nodes must be filtered to the current resource type only.");

            IEnumerable<ResourceProperty> navProperties =
                projectionNodesForCurrentResourceType == null
                ? this.Provider.GetResourceSerializableProperties(this.CurrentContainer, entityToSerialize.ResourceType).Where(p => p.TypeKind == ResourceTypeKind.EntityType)
                : projectionNodesForCurrentResourceType.Where(p => p.Property != null && p.Property.TypeKind == ResourceTypeKind.EntityType).Select(p1 => p1.Property);

            foreach (ResourceProperty property in navProperties)
            {
                ResourcePropertyInfo navProperty = this.GetNavigationPropertyInfo(expanded, entityToSerialize.Entity, entityToSerialize.ResourceType, property);
                ODataNavigationLink navLink = this.GetNavigationLink(entityToSerialize, navProperty.Property);

                // WCF Data Services show performance degradation with JsonLight when entities have > 25 Navgations on writing entries
                // DEVNOTE: for performance reasons, if the link has no content due to the metadata level, and is not expanded
                // then don't tell ODataLib about it at all.
                if (navLink.Url == null && navLink.AssociationLinkUrl == null && !navProperty.Expand)
                {
                    continue;
                }

                var linkArgs = new DataServiceODataWriterNavigationLinkArgs(navLink, this.Service.OperationContext);
                this.dataServicesODataWriter.WriteStart(linkArgs);

                if (navProperty.Expand)
                {
                    object navPropertyValue = navProperty.Value;
                    IExpandedResult navPropertyExpandedResult = navPropertyValue as IExpandedResult;
                    object expandedPropertyValue =
                                navPropertyExpandedResult != null ?
                                GetExpandedElement(navPropertyExpandedResult) :
                                navPropertyValue;

                    bool needPop = this.PushSegmentForProperty(navProperty.Property, entityToSerialize.ResourceType, navProperty.ExpandedNode);

                    // if this.CurrentContainer is null, the target set of the navigation property is hidden.
                    if (this.CurrentContainer != null)
                    {
                        if (navProperty.Property.Kind == ResourcePropertyKind.ResourceSetReference)
                        {
                            IEnumerable enumerable;
                            bool collection = WebUtil.IsElementIEnumerable(expandedPropertyValue, out enumerable);
                            Debug.Assert(collection, "metadata loading must have ensured that navigation set properties must implement IEnumerable");

                            QueryResultInfo queryResults = new QueryResultInfo(enumerable);
                            try
                            {
                                queryResults.MoveNext();
                                Func<Uri> getNavPropertyRelativeUri = () => RequestUriProcessor.AppendUnescapedSegment(entityToSerialize.SerializedKey.RelativeEditLink, navLink.Name);
                                Func<Uri> getNavPropertyAbsoluteUri = () => RequestUriProcessor.AppendUnescapedSegment(entityToSerialize.SerializedKey.AbsoluteEditLink, navLink.Name);
                                this.WriteFeedElements(navPropertyExpandedResult, queryResults, navProperty.Property.ResourceType, navLink.Name, getNavPropertyRelativeUri, getNavPropertyAbsoluteUri, false);
                            }
                            finally
                            {
                                // After the navigation property is completely serialized, dispose the property value.
                                WebUtil.Dispose(queryResults);
                            }
                        }
                        else if (WebUtil.IsNullValue(expandedPropertyValue))
                        {
                            // Write a null reference navigation property
                            var entryArgs = new DataServiceODataWriterEntryArgs(null, null, this.Service.OperationContext);
                            this.dataServicesODataWriter.WriteStart(entryArgs);
                            this.dataServicesODataWriter.WriteEnd(entryArgs);
                        }
                        else
                        {
                            this.WriteEntry(navPropertyExpandedResult, expandedPropertyValue, resourceInstanceInFeed, navProperty.Property.ResourceType);
                        }
                    }

                    this.PopSegmentName(needPop);
                }

                this.dataServicesODataWriter.WriteEnd(linkArgs); // end of navigation property
            }
        }