DevExpress的TreeList怎样给树节点设置图标

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

 

 

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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 = 0;
treelist1.nodes.firstordefault().firstnode.imageindex = 1;
treelist1.nodes.firstordefault().firstnode.firstnode.imageindex = 2;

 

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 = 0;
            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 = "1";
            node1.parentid = null;
            node1.nodetext = "1公众号";

            datatreenode node11 = new datatreenode();
            node11.id = "2";
            node11.parentid = "1";
            node11.nodetext = "1-1霸道的程序猿";

            datatreenode node111 = new datatreenode();
            node111.id = "3";
            node111.parentid = "2";
            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 = 0;
            treelist1.nodes.firstordefault().firstnode.imageindex = 1;
            treelist1.nodes.firstordefault().firstnode.firstnode.imageindex = 2;
        }
    }
}