根据图标名称动态设置TreeList图标

1：在事件InitializeComponent中加载获取图标并加载进入ImageCollection(Name:icFolders)

this.icFolders.ImageStream = ((DevExpress.Utils.ImageCollectionStreamer)(resources.GetObject("icFolders.ImageStream")));
            this.icFolders.InsertGalleryImage("apply_16x16.png", "images/actions/apply_16x16.png", DevExpress.Images.ImageResourceCache.Default.GetImage("images/actions/apply_16x16.png"), 0);
            this.icFolders.Images.SetKeyName(0, "apply");
            this.icFolders.InsertGalleryImage("fill_16x16.png", "images/actions/fill_16x16.png", DevExpress.Images.ImageResourceCache.Default.GetImage("images/actions/fill_16x16.png"), 1);
            this.icFolders.Images.SetKeyName(1, "fill");

2：TreeList节点动态加载图标

遍历节点设置节点属性

//TreeListNode tln
tln.ImageIndex = icFolders.Images.IndexOf(icFolders.Images["fill"]);
tln.SelectImageIndex = icFolders.Images.IndexOf(icFolders.Images["fill"]);