Method AddBefore

AddBefore(Node, T, bool)

Adds a value before the specified node.

Declaration

public WeakList<T>.Node? AddBefore(WeakList<T>.Node currentNode, T value, bool allowBeforeRemovedNode)

Parameters

Type	Name	Description
WeakList<T>.Node	currentNode	The node to add the value before.
T	value	The value to add.
bool	allowBeforeRemovedNode	true to add the value near the position that currentNode occupied if it has been removed from the list, or false to return null in that case.

Returns

Type	Description
WeakList<T>.Node	The node that was added, or null if currentNode has been removed from the list and allowBeforeRemovedNode is false.

Remarks

This operation takes O(1) time unless currentNode has been removed from the list, in which case the list is searched backwards from its former position for the nearest node that is still present and the value is added after that node.

Values added relative to a node that has been removed may end up in a different relative order than they would have had if the node were still in the list.

Exceptions

Type	Condition
ArgumentNullException	value is null.
InvalidOperationException	currentNode does not belong to this list.
ObjectDisposedException	The list has been disposed.

AddBefore(Node, T)

Adds a value before the specified node, or near the position the node occupied if it has been removed from the list.

Declaration

public WeakList<T>.Node AddBefore(WeakList<T>.Node currentNode, T value)

Parameters

Type	Name	Description
WeakList<T>.Node	currentNode	The node to add the value before.
T	value	The value to add.

Returns

Type	Description
WeakList<T>.Node	The node that was added.

Remarks

This operation takes O(1) time unless currentNode has been removed from the list, in which case the list is searched backwards from its former position for the nearest node that is still present and the value is added after that node.

Values added relative to a node that has been removed may end up in a different relative order than they would have had if the node were still in the list.

Exceptions

Type	Condition
ArgumentNullException	value is null.
InvalidOperationException	currentNode does not belong to this list.
ObjectDisposedException	The list has been disposed.