正文
DevExpress的TreeList怎样给树节点设置图标
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场景
DevExpress的TreeList怎样设置数据源使其显示成单列树形结构：
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/102742426
在上面设置TreeList的数据源并设置其为树形结构后，如何给树形结构设置图标
注：
博客主页：
https://blog.csdn.net/badao_liumang_qizhi
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实现
首先按照上面搭建好树形结构和设置数据源之后效果如下
然后在项目下新建Resources目录，将图标文件复制进去
然后在窗体类中获取图标数组
public static System.Drawing.Image[] imgs = new System.Drawing.Image[] {
System.Drawing.Image.FromFile(@"../../Resources/a.png"),
System.Drawing.Image.FromFile(@"../../Resources/b.png"),
System.Drawing.Image.FromFile(@"../../Resources/c.png")
};
这里路径为什么是两层上级目录，因为Resources目录相对应bin/debug的目录如此
然后在窗体加载完的事件中对TreeList设置完数据源之后，设置每个节点的图标。
System.Windows.Forms.ImageList imgList = new System.Windows.Forms.ImageList();
imgList.Images.AddRange(imgs);
treeList1.SelectImageList = imgList;
treeList1.Nodes.FirstOrDefault().ImageIndex = ;
treeList1.Nodes.FirstOrDefault().FirstNode.ImageIndex = ;
treeList1.Nodes.FirstOrDefault().FirstNode.FirstNode.ImageIndex = ;
这里是通过treeList1.Nodes.FirstOrDefault()找到第一个节点或者默认节点，即根节点。
然后通过FirstNode找到第一个子节点。
然后treeList1.SelectImageList = imgList设置其图标源是一个图标数组。
然后指定每个节点的ImageIndex 就是在图标数组中的索引。
完整示例代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace TreeListTest
{
public partial class Form1 : Form
{ public static System.Drawing.Image[] imgs = new System.Drawing.Image[] {
System.Drawing.Image.FromFile(@"../../Resources/a.png"),
System.Drawing.Image.FromFile(@"../../Resources/b.png"),
System.Drawing.Image.FromFile(@"../../Resources/c.png")
}; public Form1()
{
InitializeComponent();
} private void Form1_Load(object sender, EventArgs e)
{ #region 设置列头、节点指示器面板、表格线样式 treeList1.OptionsView.ShowColumns = false; //隐藏列标头
treeList1.OptionsView.ShowIndicator = false; //隐藏节点指示器面板
treeList1.OptionsView.ShowHorzLines = false; //隐藏水平表格线
treeList1.OptionsView.ShowVertLines = false; //隐藏垂直表格线
treeList1.OptionsView.ShowIndentAsRowStyle = false; #endregion #region 初始禁用单元格选中，禁用整行选中 treeList1.OptionsView.ShowFocusedFrame = true; //设置显示焦点框
treeList1.OptionsSelection.EnableAppearanceFocusedCell = false; //禁用单元格选中
treeList1.OptionsSelection.EnableAppearanceFocusedRow = false; //禁用正行选中 #endregion #region 设置TreeList的展开折叠按钮样式和树线样式 treeList1.OptionsView.ShowButtons = true; //显示展开折叠按钮
treeList1.LookAndFeel.UseDefaultLookAndFeel = false; //禁用默认外观与感觉
treeList1.LookAndFeel.UseWindowsXPTheme = true; //使用WindowsXP主题
treeList1.TreeLineStyle = DevExpress.XtraTreeList.LineStyle.Percent50; //设置树线的样式 #endregion #region 添加单列 DevExpress.XtraTreeList.Columns.TreeListColumn colNode = new DevExpress.XtraTreeList.Columns.TreeListColumn();
colNode.Name = String.Format("col{0}", "NodeText");
colNode.Caption = "NodeText";
colNode.FieldName = "NodeText";
colNode.VisibleIndex = ;
colNode.Visible = true; colNode.OptionsColumn.AllowEdit = false; //是否允许编辑
colNode.OptionsColumn.AllowMove = false; //是否允许移动
colNode.OptionsColumn.AllowMoveToCustomizationForm = false; //是否允许移动至自定义窗体
colNode.OptionsColumn.AllowSort = false; //是否允许排序
colNode.OptionsColumn.FixedWidth = false; //是否固定列宽
colNode.OptionsColumn.ReadOnly = true; //是否只读
colNode.OptionsColumn.ShowInCustomizationForm = true; //移除列后是否允许在自定义窗体中显示 treeList1.Columns.Clear();
treeList1.Columns.AddRange(new DevExpress.XtraTreeList.Columns.TreeListColumn[] { colNode }); #endregion treeList1.KeyFieldName = "Id";
treeList1.ParentFieldName = "ParentId"; DataTreeNode node1 = new DataTreeNode();
node1.Id = "";
node1.ParentId = null;
node1.NodeText = "1公众号"; DataTreeNode node11 = new DataTreeNode();
node11.Id = "";
node11.ParentId = "";
node11.NodeText = "1-1霸道的程序猿"; DataTreeNode node111 = new DataTreeNode();
node111.Id = "";
node111.ParentId = "";
node111.NodeText = "1-1-1大量编程资源"; List<DataTreeNode> data = new List<DataTreeNode>(); data.Add(node1);
data.Add(node11);
data.Add(node111); treeList1.DataSource = data;
treeList1.RefreshDataSource(); System.Windows.Forms.ImageList imgList = new System.Windows.Forms.ImageList();
imgList.Images.AddRange(imgs); treeList1.SelectImageList = imgList; treeList1.Nodes.FirstOrDefault().ImageIndex = ;
treeList1.Nodes.FirstOrDefault().FirstNode.ImageIndex = ;
treeList1.Nodes.FirstOrDefault().FirstNode.FirstNode.ImageIndex = ;
}
}
}
