UnityEditor.GUID.GetHashCode C# (CSharp) Method

        public override int GetHashCode()
        {
            return this.m_Value0.GetHashCode();
        }

        protected override DragAndDropVisualMode HandleDragAndDrop(DragAndDropArgs args)
        {
            DragAndDropVisualMode visualMode = DragAndDropVisualMode.None;

            var draggedIDs = DragAndDrop.GetGenericData("BuildPlayerSceneTreeViewItem") as List <int>;

            if (draggedIDs != null && draggedIDs.Count > 0)
            {
                visualMode = DragAndDropVisualMode.Move;
                if (args.performDrop)
                {
                    int newIndex = FindDropAtIndex(args);

                    var result   = new List <TreeViewItem>();
                    int toInsert = 0;
                    foreach (var item in rootItem.children)
                    {
                        if (toInsert == newIndex)
                        {
                            foreach (var id in draggedIDs)
                            {
                                result.Add(FindItem(id, rootItem));
                            }
                        }
                        toInsert++;
                        if (!draggedIDs.Contains(item.id))
                        {
                            result.Add(item);
                        }
                    }

                    if (result.Count < rootItem.children.Count) //must be appending.
                    {
                        foreach (var id in draggedIDs)
                        {
                            result.Add(FindItem(id, rootItem));
                        }
                    }
                    rootItem.children          = result;
                    EditorBuildSettings.scenes = GetSceneList();
                    ReloadAndSelect(draggedIDs);
                    Repaint();
                }
            }
            else if (DragAndDrop.paths != null && DragAndDrop.paths.Length > 0)
            {
                visualMode = DragAndDropVisualMode.Copy;
                if (args.performDrop)
                {
                    var scenes      = new List <EditorBuildSettingsScene>(EditorBuildSettings.scenes);
                    var scenesToAdd = new List <EditorBuildSettingsScene>();
                    var selection   = new List <int>();

                    foreach (var path in DragAndDrop.paths)
                    {
                        if (AssetDatabase.GetMainAssetTypeAtPath(path) == typeof(SceneAsset))
                        {
                            var guid = new GUID(AssetDatabase.AssetPathToGUID(path));
                            selection.Add(guid.GetHashCode());

                            bool unique = true;
                            foreach (var scene in scenes)
                            {
                                if (scene.path == path)
                                {
                                    unique = false;
                                    break;
                                }
                            }
                            if (unique)
                            {
                                scenesToAdd.Add(new EditorBuildSettingsScene(path, true));
                            }
                        }
                    }


                    int newIndex = FindDropAtIndex(args);
                    scenes.InsertRange(newIndex, scenesToAdd);
                    EditorBuildSettings.scenes = scenes.ToArray();
                    ReloadAndSelect(selection);
                    Repaint();
                }
            }
            return(visualMode);
        }