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   [Expand]TreeListNodesIterator Class
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      CanContinueIteration Method
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 End-User Documentation
View this topic on docs.devexpress.com (Learn more)

TreeListOperation.NeedsVisitChildren Method

Gets a value specifying whether the operation must be performed on the specified node's children.

Namespace:DevExpress.XtraTreeList.Nodes.Operations
Assembly:DevExpress.XtraTreeList.v19.2.dll

Expanded Syntax

Parameters

node
Type: TreeListNode
A TreeListNode object representing the node whose child nodes are to be visited.

Return value

Type: Boolean
true if the operation must be performed on the specified node's children; otherwise false.

Expanded Remarks

When traversing through nodes using the nodes iterator, you can specify which nodes from the specified range are to be visited using the NeedsFullIteration property and the NeedsVisitChildren method. The list below describes the relationship between these two members.

  • The NeedsFullIteration property is set to true. In this case, if the NeedsVisitChildren method returns false for a parent node, this node's children are not visited.
  • The NeedsFullIteration property is set to false. In this case, only nodes that have children are visited. If the NeedsVisitChildren method returns false for a parent node, it is omitted (together with its children).

For instance, when you want to traverse through nodes that are not hidden within collapsed groups, children of collapsed nodes must not be visited. Thus, you can return the tested node's TreeListNode.Expanded property value in the implementation of the NeedsVisitChildren method.

Expanded Example

The following sample code declares the TreeListCustomCountOperation operation class. It can be used to calculate the number of nodes whose parent contains the value of "Monterey" in its Location field.

The operation is performed by calling the TreeListNodesIterator.DoOperation method. Its result is stored to the result variable.

Expanded See Also

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