public T this[
	int index
] { get; set; }

Public Default Property Item ( 
	index As Integer
) As T
	Get
	Set

public:
property T default[int index] {
	T get (int index);
	void set (int index, T value);
}

member Item : 'T with get, set

Parameters

index

Type: SystemInt32
The zero-based index of the element to get or set.

Return Value

If you iterates thought a significant number of elements using this indexer, you may encounter performance issue if the underlying buffer is not a managed buffer (CanGetBuffer returns false).

For better performances, you can consider using the DataPointer property combined with unsafe code to access/modify the underlying native buffer.

Reference