C# (CSharp) UndoService.Do示例

示例#1

        public static void UndoService_DoUndoRedoTest()
        {
            var undoService = new UndoService();
            var value       = -1;

            for (var i = 0; i < 10; i++)
            {
                var command = new UndoCommand(() => value++, () => value--);
                undoService.Do(command);
                Assert.AreEqual(i, value);
            }

            Assert.True(undoService.CanUndo);
            Assert.False(undoService.CanRedo);

            var undoValue = value;

            while (undoService.CanUndo)
            {
                undoService.Undo();
                Assert.AreEqual(--undoValue, value);
            }

            Assert.False(undoService.CanUndo);
            Assert.True(undoService.CanRedo);

            var redoValue = value;

            while (undoService.CanRedo)
            {
                undoService.Redo();
                Assert.AreEqual(++redoValue, value);
            }

            Assert.True(undoService.CanUndo);
            Assert.False(undoService.CanRedo);
        }