PreallocatingToArray()

TSource[] System.Linq.Enumerable.ConcatNIterator< TSource >.PreallocatingToArray ( )

inlineprivate

Definition at line 521 of file Enumerable.cs.

        {
            int count = GetCount(onlyIfCheap: true);
            if (count == 0)
            {
                return Array.Empty<TSource>();
            }
            TSource[] array = new TSource[count];
            int num = array.Length;
            ConcatNIterator<TSource> concatNIterator = this;
            checked
            {
                ConcatNIterator<TSource> concatNIterator2;
                do
                {
                    concatNIterator2 = concatNIterator;
                    ICollection<TSource> collection = (ICollection<TSource>)concatNIterator2._head;
                    int count2 = collection.Count;
                    if (count2 > 0)
                    {
                        num -= count2;
                        collection.CopyTo(array, num);
                    }
                }
                while ((concatNIterator = concatNIterator2.PreviousN) != null);
                Concat2Iterator<TSource> concat2Iterator = (Concat2Iterator<TSource>)concatNIterator2._tail;
                ICollection<TSource> collection2 = (ICollection<TSource>)concat2Iterator._second;
                int count3 = collection2.Count;
                if (count3 > 0)
                {
                    collection2.CopyTo(array, num - count3);
                }
                if (num > count3)
                {
                    ICollection<TSource> collection3 = (ICollection<TSource>)concat2Iterator._first;
                    collection3.CopyTo(array, 0);
                }
                return array;
            }
        }

References System.array, System.collection, System.Collections.Generic.Dictionary< TKey, TValue >.CopyTo(), System.Linq.count, System.Collections.Generic.Dictionary< TKey, TValue >.Count, System.Linq.Enumerable.ConcatNIterator< TSource >.GetCount(), and System.Array.Length.

Referenced by System.Linq.Enumerable.ConcatNIterator< TSource >.ToArray().