FastQuant.DataSeries.DeleteKey C# (CSharp) Method

        private void DeleteKey(DataKey key)
        {
            if (key.position == this.position2)
            {
                if (key.prev != -1)
                {
                    this.position2 = key.prev;
                }
                else
                {
                    this.position1 = -1;
                    this.position2 = -1;
                }
            }
            this.file.DeleteKey(key, false, true);
            if (key.prev != -1)
            {
                var k = this.cache[key.number - 1];
                if (k != null)
                {
                    k.next = key.next;
                    if (!k.changed)
                        SetNext(key.prev, key.next);
                }
                else
                {
                    SetNext(key.prev, key.next);
                }
            }
            if (key.next != -1)
            {
                var k = this.cache[key.number + 1];
                if (k != null)
                {
                    k.prev = key.prev;
                    if (!k.changed)
                        SetPrev(key.next, key.prev);
                }
                else
                {
                    SetPrev(key.next, key.prev);
                }
            }
            for (int i = key.number; i < this.bufferCount - 1; i++)
            {
                this.cache[i] = this.cache[i + 1];
                if (this.cache[i] != null)
                    this.cache[i].number = i;
            }
            this.bufferCount--;
            this.file.WriteKey(this.key);
        }