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   [Collapse]TreeListNodesIterator Class
     TreeListNodesIterator Members
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       DoOperation(TreeListOperationDelegate) Method
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 End-User Documentation
View this topic on docs.devexpress.com (Learn more)

TreeListNodesIterator.DoOperation(TreeListOperation) Method

Performs the specified operation across all nodes.

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

Expanded Syntax

Parameters

operation
Type: TreeListOperation
A TreeListOperation descendant representing the operation to be performed.

Expanded Remarks

Use the DoOperation method to traverse through all nodes within the Tree List control. The operation performed across visited nodes is specified by a TreeListOperation descendant object passed as the parameter. Create the desired descendant, instantiate it and pass to this method. Please see the TreeListOperation class description for information on how a custom operation class can be created.

The specified operation object can prevent the iterator from visiting certain nodes. The following conditions define which nodes are visited.

For visited nodes the TreeListOperation.Execute method is called if the TreeListOperation.CanContinueIteration property returns True.

Calling the DoOperation method is equivalent to calling the DoLocalOperation method with the root nodes collection as the parameter.

Expanded Example

The following sample code shows you how to create a custom operation class. It is used to calculate the maximum length of cell values within the specified column. The created TreeListMaxLengthOperation class is derived from the TreeListOperation class for this purpose.

The DoOperation method is used to perform the operation. The result of calculations is written into the result variable.

Expanded See Also

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