ToolStripMenuItem Click 后获得 SourceControl 问题
在一个listbox中，ContextMenuStrip 被绑定了一个多级的ToolStripMenuItem菜单。
经过网上的一些方法，在第一级下可以获得这个菜单所属的控件。但是多级下就获取不到了。
求办法


[解决办法]
试下这个代码，虽然已经实现了你要的功能，还没有做得很完善，有点BUG，不影响简单的使用。

    public static class ContextMenuStripHelper
    {
        public static event ContextMenuStripItemClickedEventHandler ItemClick;

        static Dictionary<ContextMenuStrip, ContextMenuStripState> _menus;
        
        public static void InitializeHelper(this ContextMenuStrip menu)
        {
            if (menu == null)
                throw new ArgumentNullException("menu");

            if (_menus == null)
                _menus = new Dictionary<ContextMenuStrip, ContextMenuStripState>();

            if (!_menus.ContainsKey(menu))
            {
                WireEvents(menu);
                _menus.Add(menu, new ContextMenuStripState());
            }
        }

        static void ContextMenuStrip_Disposed(object sender, EventArgs e)
        {
            ContextMenuStrip menu = (ContextMenuStrip)sender; 
 

            UnwireEvents(menu);
            _menus.Remove(menu);
        }

        private static void WireEvents(ContextMenuStrip menu)
        {
            menu.Opening += ContextMenuStrip_Opening;
            menu.ItemClicked += ContextMenuStrip_ItemClick;
            menu.Disposed += ContextMenuStrip_Disposed;
            WireEvents(menu.Items);
        }

        private static void WireEvents(ToolStripItemCollection coll)
        {
            foreach (ToolStripMenuItem item in coll)
            {
                ToolStripDropDownItem ddi = item as ToolStripDropDownItem;

                if (ddi != null)
                {
                    ddi.DropDownItemClicked += ContextMenuStrip_ItemClick;
                    WireEvents(ddi.DropDownItems);
                }
            }
        }

        private static void UnwireEvents(ContextMenuStrip menu)
        {
            menu.Opening -= ContextMenuStrip_Opening;
            menu.ItemClicked -= ContextMenuStrip_ItemClick;
            menu.Disposed -= ContextMenuStrip_Disposed;
            UnwireEvents(menu.Items); 
 
        }

        private static void UnwireEvents(ToolStripItemCollection coll)
        {
            foreach (ToolStripMenuItem item in coll)
            {
                ToolStripDropDownItem ddi = item as ToolStripDropDownItem;

                if (ddi != null)
                {
                    ddi.DropDownItemClicked -= ContextMenuStrip_ItemClick;
                    UnwireEvents(ddi.DropDownItems);
                }
            }
        }


        static void ContextMenuStrip_ItemClick(object sender, ToolStripItemClickedEventArgs e)
        {
            if (ItemClick != null)
            {
                ContextMenuStrip menu = sender as ContextMenuStrip;

                if (menu == null)
                    menu = FindContextMenuStrip((ToolStripItem)sender);

                if (menu != null)
                {
                    ItemClick(menu, new ContextMenuStripItemClickedEventArgs(e.ClickedItem, _menus[menu].SourceControl));
                }
            } 
 
        }

        public static Control GetSourceControl(object context)
        {
            if (context == null)
                throw new ArgumentNullException("context");

            var state = GetState(context);

            if (state != null) return state.SourceControl;
            else return null;
        }

        private static ContextMenuStripState GetState(object context)
        {
            if (_menus != null)
            {
                ContextMenuStrip menu = context as ContextMenuStrip;

                if (menu == null && context is ToolStripItem)
                    menu = FindContextMenuStrip((ToolStripItem)context);

                if (menu == null && context is ToolStrip)
                    menu = FindContextMenuStrip((ToolStrip)context);

                if (menu != null)
                {
                    ContextMenuStripState state;

                    if (_menus.TryGetValue(menu, out state))
                        return state;
                } 
 
            }

            return null;
        }

        private static ContextMenuStrip FindContextMenuStrip(ToolStripItem item)
        {
            return FindContextMenuStrip(item.Owner);
        }

        private static ContextMenuStrip FindContextMenuStrip(ToolStrip toolStrip)
        {
            if (toolStrip != null)
            {
                if (toolStrip is ContextMenuStrip)
                    return (ContextMenuStrip)toolStrip;
                else if (toolStrip is ToolStripDropDown)
                    return FindContextMenuStrip(((ToolStripDropDown)toolStrip).OwnerItem);
            }

            return null;

        }

        private static void ContextMenuStrip_Opening(object sender, CancelEventArgs e)
        {
            ContextMenuStrip menu = (ContextMenuStrip)sender;
            _menus[menu].SourceControl = menu.SourceControl;
        }

        class ContextMenuStripState
        {
            public ContextMenuStripState()
            {

            }

            private Control _sourceControl; 
 

            public Control SourceControl
            {
                get { return _sourceControl; }
                set { _sourceControl = value; }
            }

        }
    }

    public class ContextMenuStripItemClickedEventArgs : ToolStripItemClickedEventArgs
    {
        public ContextMenuStripItemClickedEventArgs(ToolStripItem item, Control sourceControl)
            : base(item)
        {
            _sourceControl = sourceControl;
        }

        private Control _sourceControl;

        public Control SourceControl
        {
            get { return _sourceControl; }
        }
    }

    public delegate void ContextMenuStripItemClickedEventHandler(object sender, ContextMenuStripItemClickedEventArgs e);

        public Form1()
        {
            InitializeComponent();
            ContextMenuStripHelper.InitializeHelper(contextMenuStrip1);
            ContextMenuStripHelper.ItemClick += ContextMenuStripHelper_ItemClick;
        }

        void ContextMenuStripHelper_ItemClick(object sender, ContextMenuStripItemClickedEventArgs e)
        {
            var source = e.SourceControl;

            if (source != null) 
 
                Console.WriteLine("Source: {0}#{1}", source.GetType().Name, source.Name);
            else
                Console.WriteLine("NULL");
        }