LayoutTreeHelper Class

A helper that can search for nodes in an application’s visual and logical trees.

Namespace: DevExpress.WinUI.Core

Assembly: DevExpress.WinUI.Core.v22.1.dll

NuGet Package: DevExpress.WinUI

Declaration

C#

public static class LayoutTreeHelper

VB.NET

Public Module LayoutTreeHelper

Remarks

Retrieve an Object’s Visual Parents

Call the GetVisualParents(DependencyObject, DependencyObject) method to search for visual parents of an object that is placed in a visual or logical tree.

C#

public static IEnumerable<DependencyObject> GetVisualParents(
    DependencyObject child, 
    DependencyObject stopNode = null
)

This function returns a LINQ compatible collection. It allows you to use LINQ methods to access nodes of the visual and logical trees.

For example, the following code sample obtains a specific parent Grid:

C#

var obj  = LayoutTreeHelper.GetVisualParents(PART_Button as DependencyObject)
    .OfType<Grid>()
    .FirstOrDefault(x => x.Name == "PART_Grid");

Retrieve an Object’s Visual Children

Call the GetVisualChildren(DependencyObject) method to search for visual children of an object that is placed in a visual tree.

To access the visual children of an object, you can use the LayoutTreeHelper.GetVisualChildren function.

C#

public static IEnumerable<DependencyObject> GetVisualChildren(DependencyObject parent)

Similar to GetVisualParents, this function also returns a LINQ compatible collection. Thus, you can also use LINQ extension methods to obtain the required child nodes.

The code sample below obtains the child CheckBox named PART_CheckBox by using the GetVisualChildren function.

C#

var obj = LayoutTreeHelper.GetVisualChildren(PART_Grid as DependencyObject)
    .OfType<CheckBox>()
    .FirstOrDefault(x => x.Name == "PART_CheckBox");

Inheritance

Object

LayoutTreeHelper