DevExpress TreeList树形表格组件使用

private void LoadTree(List<dt_Device> data)
{
    tlAccountItem.LookAndFeel.UseDefaultLookAndFeel = false;
    tlAccountItem.LookAndFeel.UseWindowsXPTheme = true;
    tlAccountItem.OptionsSelection.EnableAppearanceFocusedCell = false;
    tlAccountItem.KeyFieldName = nameof(dt_Device.isid);//设置主键 
    tlAccountItem.ParentFieldName = nameof(dt_Device.ParentIsid);//设置父级主键 
    tlAccountItem.RootValue = null;//顶级树结点的值 
    tlAccountItem.DataSource = data;
    DevTreeListView.SetImageIndex(tlAccountItem, null, 1, 0);
    tlAccountItem.ExpandAll();
}

/// <summary>
/// 设置TreeList显示的图标
/// </summary>
/// <param name="tl">TreeList组件</param>
/// <param name="node">当前结点，从根结构递归时此值必须=null</param>
/// <param name="nodeIndex">根结点图标(无子结点)</param>
/// <param name="parentIndex">有子结点的图标</param>
public static void SetImageIndex(TreeList tl, TreeListNode node, int nodeIndex, int parentIndex)
{
    if (node == null)
    {
        foreach (TreeListNode N in tl.Nodes)
            SetImageIndex(tl, N, nodeIndex, parentIndex);
    }
    else
    {
        if (node.HasChildren || node.ParentNode == null)
        {
            //node.SelectImageIndex = parentIndex;
            node.StateImageIndex = parentIndex;
            node.ImageIndex = parentIndex;
        }
        else
        {
            //node.SelectImageIndex = nodeIndex;
            node.StateImageIndex = nodeIndex;
            node.ImageIndex = nodeIndex;
        }

        foreach (TreeListNode N in node.Nodes)
        {
            SetImageIndex(tl, N, nodeIndex, parentIndex);
        }
    }
}