System.Windows.Forms.ToolStripItemCollection.RemoveAt C# (CSharp) Méthode

		public void RemoveAt (int index)
		{
			if (this.IsReadOnly)
				throw new NotSupportedException ("This collection is read-only");

			ToolStripItem tsi = (ToolStripItem)base[index];
			this.Remove (tsi);
		}

        private static void MergeRecursive(ToolStripItem source, ToolStripItemCollection destinationItems, Stack<MergeHistoryItem> history) {
            Debug.Indent();
            MergeHistoryItem maction;
            switch (source.MergeAction) {
                case MergeAction.MatchOnly:
                case MergeAction.Replace:
                case MergeAction.Remove:
                    ToolStripItem item = FindMatch(source, destinationItems);
                    if (item != null) {
                        switch (source.MergeAction) {
                            case MergeAction.MatchOnly:
                                //Debug.WriteLine("matchonly");
                                ToolStripDropDownItem tsddownDest = item as ToolStripDropDownItem;
                                ToolStripDropDownItem tsddownSrc = source as ToolStripDropDownItem;
                                if (tsddownDest != null && tsddownSrc != null && tsddownSrc.DropDownItems.Count != 0) {

                                    int originalCount = tsddownSrc.DropDownItems.Count;

                                    if (originalCount > 0) {
                                        int lastCount = originalCount;
                                        tsddownSrc.DropDown.SuspendLayout();

                                        try {
                                            // the act of walking through this collection removes items from
                                            // the dropdown.
                                            for (int i = 0, itemToLookAt = 0; i < originalCount; i++) {

                                                MergeRecursive(tsddownSrc.DropDownItems[itemToLookAt], tsddownDest.DropDownItems, history);

                                                int numberOfItemsMerged = lastCount - tsddownSrc.DropDownItems.Count;
                                                itemToLookAt = (numberOfItemsMerged > 0) ? itemToLookAt : itemToLookAt + 1;
                                                lastCount = tsddownSrc.DropDownItems.Count;
                                            }
                                        }
                                        finally {
                                            tsddownSrc.DropDown.ResumeLayout();
                                        }
                                    }
                                }
                                break;
                            case MergeAction.Replace:
                            case MergeAction.Remove:
                                //Debug.WriteLine("remove");
                                maction = new MergeHistoryItem(MergeAction.Insert);
                                maction.TargetItem = item;
                                int indexOfDestinationItem = destinationItems.IndexOf(item);
                                destinationItems.RemoveAt(indexOfDestinationItem);
                                maction.Index = indexOfDestinationItem;
                                maction.IndexCollection = destinationItems;
                                maction.TargetItem = item;
                                history.Push(maction);
                                //Debug.WriteLine(maction.ToString());
                                if (source.MergeAction == MergeAction.Replace) {
                                    //Debug.WriteLine("replace");
                                    //ToolStripItem clonedItem = source.Clone();
                                    maction = new MergeHistoryItem(MergeAction.Remove);
                                    maction.PreviousIndexCollection = source.Owner.Items;
                                    maction.PreviousIndex = maction.PreviousIndexCollection.IndexOf(source);
                                    maction.TargetItem = source;
                                    destinationItems.Insert(indexOfDestinationItem, source);
                                    maction.Index = indexOfDestinationItem;
                                    maction.IndexCollection = destinationItems;
                                    history.Push(maction);
                                    //Debug.WriteLine(maction.ToString());
                                }
                                break;
                        }
                    }
                    break;
                case MergeAction.Insert:
                    if (source.MergeIndex > -1) {
                        maction = new MergeHistoryItem(MergeAction.Remove);
                        maction.PreviousIndexCollection = source.Owner.Items;
                        maction.PreviousIndex = maction.PreviousIndexCollection.IndexOf(source);
                        maction.TargetItem = source;
                        int insertIndex = Math.Min(destinationItems.Count, source.MergeIndex);
                        destinationItems.Insert(insertIndex, source);
                        maction.IndexCollection = destinationItems;
                        maction.Index = insertIndex;
                        history.Push(maction);
                        //Debug.WriteLine(maction.ToString());
                    }
                    break;
                case MergeAction.Append:
                    maction = new MergeHistoryItem(MergeAction.Remove);
                    maction.PreviousIndexCollection = source.Owner.Items;
                    maction.PreviousIndex = maction.PreviousIndexCollection.IndexOf(source);
                    maction.TargetItem = source;
                    int index = destinationItems.Add(source);
                    maction.Index = index;
                    maction.IndexCollection = destinationItems;
                    history.Push(maction);
                    //Debug.WriteLine(maction.ToString());
                    break;
            }
            Debug.Unindent();
        }