C# UndoManager类代码示例

        public void SetUp()
        {
            _comboBox = new ComboBox();
            _comboBox.SetValue(UndoManager.UndoScopeNameProperty, "ScopeName");
            _fakeVm = new FakeVm();
            var selected = new Binding("SelectedEnum")
            {
                Source = _fakeVm,
                UpdateSourceTrigger = UpdateSourceTrigger.Explicit,
                NotifyOnSourceUpdated = true,
                NotifyOnTargetUpdated = true,
                Mode = BindingMode.TwoWay
            };
            BindingOperations.SetBinding(_comboBox, Selector.SelectedItemProperty, selected);

            var itemsSource = new Binding("EnumValues")
            {
                Source = _fakeVm,
                UpdateSourceTrigger = UpdateSourceTrigger.Explicit,
                NotifyOnSourceUpdated = true,
                NotifyOnTargetUpdated = true,
                Mode = BindingMode.OneWay
            };
            BindingOperations.SetBinding(_comboBox, ItemsControl.ItemsSourceProperty, itemsSource);
            _comboBox.DataContext = _fakeVm;
            _undoManager = UndoManager.GetUndoManager(_comboBox);
        }

		/// <summary>
		/// Initializes a new instance of <see cref="UndoPopup"/>.
		/// </summary>
		/// <param name="undoManager">The undo manager used to populate the action list.</param>
		/// <param name="mode">The mode the popup shows actions for.</param>
		public UndoPopup(UndoManager undoManager, UndoPopupMode mode)
			: base(new Control())
		{
			// Set some defaults on the host control.
			Control.Margin = Padding.Empty;
			Control.Size = new Size(400, 300);
			Control.TabStop = false;

			// Add the listbox.
			_listBox = new ListBox
			{
				Dock = DockStyle.Fill,
				BorderStyle = BorderStyle.None,
				IntegralHeight = false,
				SelectionMode = SelectionMode.MultiSimple,
				HorizontalScrollbar = true
			};
			_listBox.MouseDown += ListBox_MouseDown;
			_listBox.MouseMove += ListBox_MouseMove;

			Control.Controls.Add(_listBox);

			// Create tooltip.
			_tooltip = new ToolTip();

			_mode = mode;
			UndoManager = undoManager;
		}

 void Start()
 {
     playerSelectManager = GetComponent<PlayerSelectManager>();
     gameManager = GetComponent<GameManager>();
     undoManager = GetComponent<UndoManager>();
     mapGenerator = GetComponent<MapGenerator>();
     currentActionSelected = -1;
     tileColorManager = GetComponent<TileColorManager>();
 }

 public UndoRedoAction(UndoManager undoManager, int position, string oldText, string newText,
     int insertMarkPosition, int selectionBoundPosition)
 {
     this.undoManager = undoManager;
     Position = position;
     OldText = oldText;
     NewText = newText;
     this.insertMarkPosition = insertMarkPosition;
     this.selectionBoundPosition = selectionBoundPosition;
 }

 public UndoRedoButtons(UndoManager undoManager,
     ToolStripMenuItem undoMenuItem, ToolStripSplitButton undoButton,
     ToolStripMenuItem redoMenuItem, ToolStripSplitButton redoButton,
     Action<Action> runUIAction)
 {
     _undoManager = undoManager;
     _undoMenuItem = undoMenuItem;
     _undoButton = undoButton;
     _redoMenuItem = redoMenuItem;
     _redoButton = redoButton;
     _runUIAction = runUIAction;
 }

        public UndoManagerVm(string name, UndoManager manager)
        {
            Name = name;
            Manager = manager;

            UndoStack = new CollectionView(Manager.History.UndoStack);
            RedoStack = new CollectionView(Manager.History.RedoStack);
            manager.History.PropertyChanged += (sender, args) =>
            {
                UndoStack.Refresh();
                RedoStack.Refresh();
            };
        }

 public MainWindow()
     : base(Gtk.WindowType.Toplevel)
 {
     Build ();
     _undoManager = new UndoManager ();
     View = new StandardDrawingView (this);
     _scrolledwindow.Add ((Widget) View);
     Tool = new SelectionTool (this);
     UndoManager.StackChanged += delegate {
         UpdateUndoRedoSensitiveness ();
     };
     ShowAll ();
 }

    void Start()
    {
        initializeEntityLists();
		turnsCompleted = 0;
        gameManager = this;
        currentPlayers = new LinkedList<Entity>();
        currentTurn = JANITOR;
        cameraManager = GetComponent<CameraManager>();
        undoManager = GetComponent<UndoManager>();
        uiManager = GameObject.FindObjectOfType<UIManager>();
        aiStateMachine = GameObject.FindObjectOfType<AIStateMachine>();
        turnsLeft = turnsPerPlayer;
        updateEntitiesPresent();
    }

 public void ExecuteXDocumentVariation(XNode toReplace, XNode newValue)
 {
     XDocument xDoc = new XDocument(toReplace);
     XDocument xDocOriginal = new XDocument(xDoc);
     using (UndoManager undo = new UndoManager(xDoc))
     {
         undo.Group();
         using (EventsHelper docHelper = new EventsHelper(xDoc))
         {
             toReplace.ReplaceWith(newValue);
             docHelper.Verify(new XObjectChange[] { XObjectChange.Remove, XObjectChange.Add }, new XObject[] { toReplace, newValue });
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(xDoc, xDocOriginal), "Undo did not work!");
     }
 }

        /// <summary>
        /// Execution of the Action.  
        /// </summary>
        /// <returns>True:  Execution of the Action was successful</returns>
        public bool Execute(ActionCallingContext ctx)
        {
            using (UndoStep undo = new UndoManager().CreateUndoStep())
            {
                SelectionSet sel = new SelectionSet();

                //Make sure that terminals are ordered by designation
                var terminals = sel.Selection.OfType<Terminal>().OrderBy(t => t.Properties.FUNC_PINORTERMINALNUMBER.ToInt());
                if (terminals.Count() < 2)
                    throw new Exception("Must select at least 2 Terminals");

                //Create a list of terminals for each level. Those lists get added to a dictionnary
                //with the level as the key.
                Dictionary<int, List<Terminal>> levels = new Dictionary<int, List<Terminal>>();

                //Fill the dictionnary
                foreach (Terminal t in terminals)
                {
                    int level = t.Properties.FUNC_TERMINALLEVEL;

                    if (!levels.ContainsKey(level))
                        levels.Add(level, new List<Terminal>());

                    levels[level].Add(t);
                }

                var keys = levels.Keys.OrderBy(k => k);

                //Make sure that all levels have the same number of terminals
                int qty = levels.First().Value.Count;
                if (!levels.All(l => l.Value.Count == qty))
                    throw new Exception("There must be the same number of Terminals on each level");

                //Assign sort code by taking a terminal from each level in sequence
                int sortCode = 1;
                for (int i = 0; i < qty; i++)
                {
                    foreach (int j in keys)
                    {
                        levels[j][i].Properties.FUNC_TERMINALSORTCODE = sortCode++;
                    }
                }

            }

            return true;
        }

 public void SetUp()
 {
     _textBox = new TextBox();
     _textBox.SetValue(UndoManager.UndoScopeNameProperty, "ScopeName");
     _fakeVm = new FakeVm();
     var binding = new Binding("Value")
     {
         Source = _fakeVm,
         UpdateSourceTrigger = UpdateSourceTrigger.Explicit,
         NotifyOnSourceUpdated = true,
         NotifyOnTargetUpdated = true,
         Mode = BindingMode.TwoWay
     };
     BindingOperations.SetBinding(_textBox, TextBox.TextProperty, binding);
     _textBox.DataContext = _fakeVm;
     _undoManager = UndoManager.GetUndoManager(_textBox);
 }

 public void ExecuteXElementVariation(XElement toChange, XName newName)
 {
     XElement original = new XElement(toChange);
     using (UndoManager undo = new UndoManager(toChange))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(toChange))
         {
             toChange.Name = newName;
             Assert.True(newName.Namespace == toChange.Name.Namespace, "Namespace did not change");
             Assert.True(newName.LocalName == toChange.Name.LocalName, "LocalName did not change");
             eHelper.Verify(XObjectChange.Name, toChange);
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(toChange, original), "Undo did not work");
     }
 }

 public void ExecuteXDocumentVariation(XNode[] content, int index)
 {
     XDocument xDoc = new XDocument(content);
     XDocument xDocOriginal = new XDocument(xDoc);
     XNode toRemove = xDoc.Nodes().ElementAt(index);
     using (UndoManager undo = new UndoManager(xDoc))
     {
         undo.Group();
         using (EventsHelper docHelper = new EventsHelper(xDoc))
         {
             toRemove.Remove();
             docHelper.Verify(XObjectChange.Remove, toRemove);
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(xDoc, xDocOriginal), "Undo did not work!");
     }
 }

 public void XProcessingInstructionPIVariation()
 {
     XProcessingInstruction toChange = new XProcessingInstruction("target", "data");
     XProcessingInstruction original = new XProcessingInstruction(toChange);
     using (UndoManager undo = new UndoManager(toChange))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(toChange))
         {
             toChange.Target = "newTarget";
             Assert.True(toChange.Target.Equals("newTarget"), "Name did not change");
             eHelper.Verify(XObjectChange.Name, toChange);
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(toChange, original), "Undo did not work");
     }
 }

 public void ExecuteXElementVariation(XNode toReplace, XNode newValue)
 {
     XElement xElem = new XElement("root", toReplace);
     XElement xElemOriginal = new XElement(xElem);
     using (UndoManager undo = new UndoManager(xElem))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(xElem))
         {
             toReplace.ReplaceWith(newValue);
             xElem.Verify();
             eHelper.Verify(new XObjectChange[] { XObjectChange.Remove, XObjectChange.Add }, new XObject[] { toReplace, newValue });
         }
         undo.Undo();
         Assert.True(xElem.Nodes().SequenceEqual(xElemOriginal.Nodes(), XNode.EqualityComparer), "Undo did not work!");
         Assert.True(xElem.Attributes().EqualsAllAttributes(xElemOriginal.Attributes(), Helpers.MyAttributeComparer), "Undo did not work!");
     }
 }