첨부 소스 코드는 나눔고딕코딩 폰트를 사용합니다.
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TestProject.zip
다운로드

▶ MainWindow.xaml

<Window x:Class="TestProject.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
    xmlns:dxg="clr-namespace:DevExpress.Xpf.Grid;assembly=DevExpress.Xpf.Grid.v13.2"
    Width="800"
    Height="600"
    Title="노드 반복자를 통해 노드를 반복하기"
    FontFamily="나눔고딕코딩"
    FontSize="16"
    dx:ThemeManager.ThemeName="Office2007Black">
    <Grid>
        <dxg:GridControl x:Name="gridControl"
            Loaded="gridControl_Loaded">
            <dxg:GridControl.Columns>
                <dxg:GridColumn FieldName="Name"       />
                <dxg:GridColumn FieldName="Department" />
                <dxg:GridColumn FieldName="Position"   />
            </dxg:GridControl.Columns>
            <dxg:GridControl.View>
                <dxg:TreeListView x:Name="treeListView"
                    KeyFieldName="ID"
                    ParentFieldName="ParentID" />
            </dxg:GridControl.View>
        </dxg:GridControl>
    </Grid>
</Window>

 

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▶ MainWindow.xaml.cs

using System.Windows;

using DevExpress.Xpf.Grid;

namespace TestProject
{
    /// <summary>
    /// 메인 윈도우
    /// </summary>
    public partial class MainWindow : Window
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainWindow()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainWindow()
        {
            InitializeComponent();

            this.gridControl.ItemsSource = EmployeeList.GetData();
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region 그리드 컨트롤 로드시 처리하기 - gridControl_Loaded(sender, e)

        /// <summary>
        /// 그리드 컨트롤 로드시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void gridControl_Loaded(object sender, RoutedEventArgs e)
        {
            ExpandNodeCollection(4);
        }

        #endregion
        #region 노드 컬렉션 확장하기 - ExpandNodeCollection(minimumChildCount)

        /// <summary>
        /// 노드 컬렉션 확장하기
        /// </summary>
        /// <param name="minimumChildCount">최소 자식 수</param>
        private void ExpandNodeCollection(int minimumChildCount)
        {
            TreeListNodeIterator treeListNodeIterator = new TreeListNodeIterator(this.treeListView.Nodes, true);

            while(treeListNodeIterator.MoveNext())
            {
                treeListNodeIterator.Current.IsExpanded = treeListNodeIterator.Current.Nodes.Count >= minimumChildCount;
            }
        }

        #endregion
    }
}
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