示例#1
0
            private int AddInternal(object item)
            {
                if (item == null)
                {
                    throw new ArgumentNullException(nameof(item));
                }
                int index = -1;

                if (!owner.sorted)
                {
                    InnerArray.Add(item);
                }
                else
                {
                    if (Count > 0)
                    {
                        index = InnerArray.BinarySearch(item);
                        if (index < 0)
                        {
                            index = ~index; // getting the index of the first element that is larger than the search value
                                            //this index will be used for insert
                        }
                    }
                    else
                    {
                        index = 0;
                    }

                    Debug.Assert(index >= 0 && index <= Count, "Wrong index for insert");
                    InnerArray.Insert(index, item);
                }
                bool successful = false;

                try
                {
                    if (owner.sorted)
                    {
                        if (owner.IsHandleCreated)
                        {
                            owner.NativeInsert(index, item);
                            owner.UpdateMaxItemWidth(item, false);
                            if (owner.selectedItems != null)
                            {
                                // Sorting may throw the LB contents and the selectedItem array out of synch.
                                owner.selectedItems.Dirty();
                            }
                        }
                    }
                    else
                    {
                        index = Count - 1;
                        if (owner.IsHandleCreated)
                        {
                            owner.NativeAdd(item);
                            owner.UpdateMaxItemWidth(item, false);
                        }
                    }
                    successful = true;
                }
                finally
                {
                    if (!successful)
                    {
                        InnerArray.Remove(item);
                    }
                }

                return(index);
            }