HierarchicalCollection<T>.FindAllRecursive(Predicate<T>) Method

Returns all elements that match the conditions defined by the specified predicate.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v24.1.dll

NuGet Package: DevExpress.Web

Declaration

C#

public IEnumerable<T> FindAllRecursive(
    Predicate<T> match
)

VB.NET

Public Function FindAllRecursive(
    match As Predicate(Of T)
) As IEnumerable(Of T)

Parameters

Name	Type	Description
match	Predicate<T>	A delegate that defines the conditions of the elements to search for.

Returns

Type	Description
IEnumerable<T>	A collection of the elements that match the conditions defined by the predicate.

Remarks

The FindAllRecursive method individually passes elements of the current hierarchical collection to a predicate, and returns a collection of elements that match the predicate. A predicate is a delegate to a method that returns true if the object passed to it matches the conditions defined in the delegate; otherwise the method returns false.

Example

The code sample below demonstrates how to get a collection of checked nodes on the server side. For this purpose, the FindAllRecursive method is used. The IsChecked predicate determines whether a node is checked.

C#

using DevExpress.Web.ASPxTreeView;
...
IEnumerable<TreeViewNode> CheckNodeList = ASPxTreeView1.Nodes.FindAllRecursive(IsChecked);
...
private static bool IsChecked(TreeViewNode node) {
     return node.Checked;
}

VB.NET

Imports DevExpress.Web.ASPxTreeView
...
Private CheckNodeList As IEnumerable(Of TreeViewNode) = ASPxTreeView1.Nodes.FindAllRecursive(IsChecked)
...
Private Shared Function IsChecked(ByVal node As TreeViewNode) As Boolean
     Return node.Checked
End Function