Quickstarts.DataAccessServer.SegmentBrowser.Next C# (CSharp) Méthode

        public override IReference Next()
        {
            UnderlyingSystem system = (UnderlyingSystem)this.SystemContext.SystemHandle;

            lock (DataLock)
            {
                IReference reference = null;

                // enumerate pre-defined references.
                // always call first to ensure any pushed-back references are returned first.
                reference = base.Next();

                if (reference != null)
                {
                    return reference;
                }

                if (m_stage == Stage.Begin)
                {
                    m_segments = system.FindSegments(m_source.SegmentPath);
                    m_stage = Stage.Segments;
                    m_position = 0;
                }

                // don't start browsing huge number of references when only internal references are requested.
                if (InternalOnly)
                {
                    return null;
                }
                
                // enumerate segments.
                if (m_stage == Stage.Segments)
                {
                    if (IsRequired(ReferenceTypeIds.Organizes, false))
                    {
                        reference = NextChild();

                        if (reference != null)
                        {
                            return reference;
                        }
                    }

                    m_blocks = system.FindBlocks(m_source.SegmentPath);
                    m_stage = Stage.Blocks;
                    m_position = 0;
                }
                
                // enumerate blocks.
                if (m_stage == Stage.Blocks)
                {
                    if (IsRequired(ReferenceTypeIds.Organizes, false))
                    {
                        reference = NextChild();

                        if (reference != null)
                        {
                            return reference;
                        }

                        m_stage = Stage.Done;
                        m_position = 0;
                    }
                }

                // all done.
                return null;
            }
        }
        #endregion