場景

DevExpress的TreeList怎樣設置數據源使其顯示成單列樹形結構：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/102742426

在上面設置TreeList的數據源并設置其為樹形結構后，如何給樹形結構設置圖標

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注：

博客主頁：
https://blog.csdn.net/badao_liumang_qizhi
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實現

首先按照上面搭建好樹形結構和設置數據源之后效果如下

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然后在項目下新建Resources目錄，將圖標文件復制進去

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然后在窗體類中獲取圖標數組

?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")};

這里路徑為什么是兩層上級目錄，因為Resources目錄相對應bin/debug的目錄如此

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然后在窗體加載完的事件中對TreeList設置完數據源之后，設置每個節點的圖標。

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;

這里是通過treeList1.Nodes.FirstOrDefault()找到第一個節點或者默認節點，即根節點。

然后通過FirstNode找到第一個子節點。

然后treeList1.SelectImageList = imgList設置其圖標源是一個圖標數組。

然后指定每個節點的ImageIndex 就是在圖標數組中的索引。

完整示例代碼：

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 設置列頭、節點指示器面板、表格線樣式treeList1.OptionsView.ShowColumns = false;???????????? //隱藏列標頭treeList1.OptionsView.ShowIndicator = false;?????????? //隱藏節點指示器面板treeList1.OptionsView.ShowHorzLines = false;?????????? //隱藏水平表格線treeList1.OptionsView.ShowVertLines = false;?????????? //隱藏垂直表格線treeList1.OptionsView.ShowIndentAsRowStyle = false;#endregion#region 初始禁用單元格選中，禁用整行選中treeList1.OptionsView.ShowFocusedFrame = true;?????????????????????????????? //設置顯示焦點框treeList1.OptionsSelection.EnableAppearanceFocusedCell = false;????????????? //禁用單元格選中treeList1.OptionsSelection.EnableAppearanceFocusedRow = false;?????????????? //禁用正行選中#endregion#region 設置TreeList的展開折疊按鈕樣式和樹線樣式treeList1.OptionsView.ShowButtons = true;????????????????? //顯示展開折疊按鈕treeList1.LookAndFeel.UseDefaultLookAndFeel = false;?????? //禁用默認外觀與感覺treeList1.LookAndFeel.UseWindowsXPTheme = true;??????????? //使用WindowsXP主題treeList1.TreeLineStyle = DevExpress.XtraTreeList.LineStyle.Percent50;???? //設置樹線的樣式#endregion#region 添加單列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;??????????????????????? //是否允許編輯colNode.OptionsColumn.AllowMove = false;??????????????????????? //是否允許移動colNode.OptionsColumn.AllowMoveToCustomizationForm = false;???? //是否允許移動至自定義窗體colNode.OptionsColumn.AllowSort = false;??????????????????????? //是否允許排序colNode.OptionsColumn.FixedWidth = false;?????????????????????? //是否固定列寬colNode.OptionsColumn.ReadOnly = true;????????????????????????? //是否只讀colNode.OptionsColumn.ShowInCustomizationForm = true;?????????? //移除列后是否允許在自定義窗體中顯示treeList1.Columns.Clear();treeList1.Columns.AddRange(new DevExpress.XtraTreeList.Columns.TreeListColumn[] { colNode });#endregiontreeList1.KeyFieldName = "Id";treeList1.ParentFieldName = "ParentId";DataTreeNode node1 = new DataTreeNode();node1.Id = "1";node1.ParentId = null;node1.NodeText = "1公眾號";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大量編程資源";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;}} }

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