c# winfrom 可折叠的树形控件

首先需要一个可绑定实体

[Serializable]
    public class TreeNodeModel
    {
        private Image _nodePic;
        /// <summary>
        /// 设置图标
        /// </summary>
        public Image NodelPic
        {
            get { return _nodePic; }
            set { _nodePic = value; }
        }
        /// <summary>
        /// 设置名称
        /// </summary>
        public string NodeText { get; set; }
        private List<TreeNodeModel> _nodes = new List<TreeNodeModel>();
        /// <summary>
        /// 子节点
        /// </summary>
        public List<TreeNodeModel> Nodes
        {
            get { return _nodes; }
            set { _nodes = value; }
        }
        /// <summary>
        /// 数据源
        /// </summary>
        public object DataSource { get; set; }
        private Color m_NodeBackgroundColor = Color.Empty;
        /// <summary>
        /// 背景颜色(默认白色)
        /// </summary>
        public Color NodeBackgroundColor
        {
            get { return m_NodeBackgroundColor; }
            set { m_NodeBackgroundColor = value; }
        }

        private bool m_canExpand = true;
        /// <summary>
        /// 是否可展开
        /// </summary>
        public bool CanExpand
        {
            get { return m_canExpand; }
            set
            {
                m_canExpand = value;
            }
        }
        private int? _nodeHeight = null;
        /// <summary>
        /// 节点高度
        /// </summary>
        public int? NodeHeight
        {
            get { return _nodeHeight; }
            set { _nodeHeight = value; }
        }
        private bool _isEventClick = true;
        /// <summary>
        /// 是否触发点击事件
        /// </summary>
        public bool IsEventClick
        {
            get { return _isEventClick; }
            set { _isEventClick = value; }
        }

        private Color nodeForeColor=Color.Empty;
        /// <summary>
        /// 字体颜色
        /// </summary>
        public Color NodeForeColor
        {
            get { return nodeForeColor; }
            set { nodeForeColor = value; }
        }
    }

然后是节点控件

设计文件

 partial class UCTreeViewNode
    {
        /// <summary> 
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary> 
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region 组件设计器生成的代码

        /// <summary> 
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.lblName = new Km.Controls.Static.LabelEx();
            this.lblUpDownPic = new Km.Controls.Static.LabelEx();
            this.panNodePic = new Km.Controls.ExPanel.PanelEx();
            this.panPic = new Km.Controls.ExPanel.PanelEx();
            this.panPadding = new Km.Controls.ExPanel.PanelEx();
            this.panNodePic.SuspendLayout();
            this.SuspendLayout();
            // 
            // lblName
            // 
            this.lblName.BackColor = System.Drawing.Color.Transparent;
            this.lblName.Dock = System.Windows.Forms.DockStyle.Fill;
            this.lblName.Font = new System.Drawing.Font("微软雅黑", 16F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.lblName.ForeColor = System.Drawing.Color.Silver;
            this.lblName.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
            this.lblName.Location = new System.Drawing.Point(45, 0);
            this.lblName.Name = "lblName";
            this.lblName.Size = new System.Drawing.Size(218, 65);
            this.lblName.TabIndex = 0;
            this.lblName.Text = "系统设置";
            this.lblName.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
            // 
            // lblUpDownPic
            // 
            this.lblUpDownPic.Anchor = System.Windows.Forms.AnchorStyles.Right;
            this.lblUpDownPic.BackColor = System.Drawing.Color.Transparent;
            this.lblUpDownPic.Image = global::Km.Controls.Properties.Resources.下翻;
            this.lblUpDownPic.Location = new System.Drawing.Point(223, 21);
            this.lblUpDownPic.Name = "lblUpDownPic";
            this.lblUpDownPic.Size = new System.Drawing.Size(37, 23);
            this.lblUpDownPic.TabIndex = 1;
            // 
            // panNodePic
            // 
            this.panNodePic.BackColor = System.Drawing.Color.Transparent;
            this.panNodePic.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Center;
            this.panNodePic.BottomborderStyleColor = System.Drawing.Color.Empty;
            this.panNodePic.BottomborderStyleSize = 0;
            this.panNodePic.BottomborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            this.panNodePic.ContainerPanel = null;
            this.panNodePic.Controls.Add(this.panPic);
            this.panNodePic.Dock = System.Windows.Forms.DockStyle.Left;
            this.panNodePic.IsSelected = false;
            this.panNodePic.LeftborderStyleColor = System.Drawing.Color.Empty;
            this.panNodePic.LeftborderStyleSize = 0;
            this.panNodePic.LeftborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            this.panNodePic.Location = new System.Drawing.Point(0, 0);
            this.panNodePic.Name = "panNodePic";
            this.panNodePic.Radius = 0;
            this.panNodePic.Redraw = false;
            this.panNodePic.RightborderStyleColor = System.Drawing.Color.Empty;
            this.panNodePic.RightborderStyleSize = 0;
            this.panNodePic.RightborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            this.panNodePic.Size = new System.Drawing.Size(45, 65);
            this.panNodePic.TabIndex = 2;
            this.panNodePic.TopborderStyleColor = System.Drawing.Color.Empty;
            this.panNodePic.TopborderStyleSize = 0;
            this.panNodePic.TopborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            // 
            // panPic
            // 
            this.panPic.BackgroundImage = global::Km.Controls.Properties.Resources.table_cell_bg1;
            this.panPic.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Zoom;
            this.panPic.BottomborderStyleColor = System.Drawing.Color.Empty;
            this.panPic.BottomborderStyleSize = 0;
            this.panPic.BottomborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            this.panPic.ContainerPanel = null;
            this.panPic.IsSelected = false;
            this.panPic.LeftborderStyleColor = System.Drawing.Color.Empty;
            this.panPic.LeftborderStyleSize = 0;
            this.panPic.LeftborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            this.panPic.Location = new System.Drawing.Point(10, 20);
            this.panPic.Name = "panPic";
            this.panPic.Radius = 0;
            this.panPic.Redraw = false;
            this.panPic.RightborderStyleColor = System.Drawing.Color.Empty;
            this.panPic.RightborderStyleSize = 0;
            this.panPic.RightborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            this.panPic.Size = new System.Drawing.Size(25, 25);
            this.panPic.TabIndex = 0;
            this.panPic.TopborderStyleColor = System.Drawing.Color.Empty;
            this.panPic.TopborderStyleSize = 0;
            this.panPic.TopborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            // 
            // panPadding
            // 
            this.panPadding.BackColor = System.Drawing.Color.Transparent;
            this.panPadding.BottomborderStyleColor = System.Drawing.Color.Empty;
            this.panPadding.BottomborderStyleSize = 0;
            this.panPadding.BottomborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            this.panPadding.ContainerPanel = null;
            this.panPadding.Dock = System.Windows.Forms.DockStyle.Left;
            this.panPadding.IsSelected = false;
            this.panPadding.LeftborderStyleColor = System.Drawing.Color.Empty;
            this.panPadding.LeftborderStyleSize = 0;
            this.panPadding.LeftborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            this.panPadding.Location = new System.Drawing.Point(0, 0);
            this.panPadding.Name = "panPadding";
            this.panPadding.Radius = 0;
            this.panPadding.Redraw = false;
            this.panPadding.RightborderStyleColor = System.Drawing.Color.Empty;
            this.panPadding.RightborderStyleSize = 0;
            this.panPadding.RightborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            this.panPadding.Size = new System.Drawing.Size(0, 65);
            this.panPadding.TabIndex = 3;
            this.panPadding.TopborderStyleColor = System.Drawing.Color.Empty;
            this.panPadding.TopborderStyleSize = 0;
            this.panPadding.TopborderStyleType = System.Windows.Forms.ButtonBorderStyle.None;
            // 
            // UCTreeViewNode
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.BackColor = System.Drawing.Color.Transparent;
            this.BottomborderStyleColor = System.Drawing.Color.FromArgb(((int)(((byte)(224)))), ((int)(((byte)(224)))), ((int)(((byte)(224)))));
            this.BottomborderStyleSize = 1;
            this.BottomborderStyleType = System.Windows.Forms.ButtonBorderStyle.Solid;
            this.Controls.Add(this.lblUpDownPic);
            this.Controls.Add(this.lblName);
            this.Controls.Add(this.panNodePic);
            this.Controls.Add(this.panPadding);
            this.Name = "UCTreeViewNode";
            this.RectColor = System.Drawing.Color.Red;
            this.Redraw = true;
            this.Size = new System.Drawing.Size(263, 65);
            this.panNodePic.ResumeLayout(false);
            this.ResumeLayout(false);

        }

        #endregion

        private Static.LabelEx lblName;
        private Static.LabelEx lblUpDownPic;
        private ExPanel.PanelEx panNodePic;
        private ExPanel.PanelEx panPic;
        private ExPanel.PanelEx panPadding;
    }

代码文件

 public partial class UCTreeViewNode : UCBase
    {
        #region 属性
        private int _nodeHeight = 65;
        /// <summary>
        /// 节点高度
        /// </summary>
        public int NodeHeight
        {
            get { return _nodeHeight; }
            set { _nodeHeight = value; }
        }
        private bool _isBrotherSingleExpanded = true;
        /// <summary>
        /// 兄弟节点是否仅有一个为展开状态
        /// </summary>
        public bool IsBrotherSingleExpanded
        {
            get { return _isBrotherSingleExpanded; }
            set { _isBrotherSingleExpanded = value; }
        }

        private Image _downPic = Properties.Resources.下翻;
        /// <summary>
        /// 下翻图标
        /// </summary>
        public Image DownPic
        {
            get { return _downPic; }
            set
            {
                _downPic = value;
                lblUpDownPic.Image = value;
            }
        }

        private Image _upPic = Properties.Resources.上翻;
        /// <summary>
        /// 上翻图标
        /// </summary>
        public Image UpPic
        {
            get { return _upPic; }
            set { _upPic = value; }
        }
        private Color m_NodeBackgroundColor = Color.White;

        /// <summary>
        /// 背景颜色
        /// </summary>
        public Color NodeBackgroundColor
        {
            get { return m_NodeBackgroundColor; }
            set
            {
                m_NodeBackgroundColor = value;
                this.BackColor = value;
            }
        }

        private bool m_isExpanded = false;
        /// <summary>
        /// 是否已展开
        /// </summary>
        public bool IsExpanded
        {
            get { return m_isExpanded; }
            private set { m_isExpanded = value; }
        }

        private bool m_canExpand = false;
        /// <summary>
        /// 是否可展开
        /// </summary>
        public bool CanExpand
        {
            get { return m_canExpand; }
            set
            {
                m_canExpand = value;
                lblUpDownPic.Visible = value;
            }
        }

        private TreeNodeModel m_source;
        /// <summary>
        /// 数据源
        /// </summary>
        public TreeNodeModel Source
        {
            get { return m_source; }
            set
            {
                m_source = value;
                NodelPic = value.NodelPic;
                NodeText = value.NodeText;
                if (value.NodeBackgroundColor != Color.Empty)
                    NodeBackgroundColor = value.NodeBackgroundColor;
                CanExpand = value.CanExpand;
                if (value.Nodes.Count > 0)
                {
                    lblUpDownPic.Visible = true;
                }
                else
                {
                    lblUpDownPic.Visible = false;
                }
            }
        }
        private string m_nodeText;
        /// <summary>
        /// 标题文字
        /// </summary>
        public string NodeText
        {
            get { return m_nodeText; }
            set
            {
                m_nodeText = value;
                lblName.Text = value;
            }
        }

        private int m_nodeLeftPadding = 0;
        /// <summary>
        /// 
        /// </summary>
        public int NodeLeftPadding
        {
            get { return m_nodeLeftPadding; }
            set
            {
                m_nodeLeftPadding = value;
                panPadding.Width = value;
            }
        }

        private Image _nodePic;
        /// <summary>
        /// 设置图标
        /// </summary>
        public Image NodelPic
        {
            get { return _nodePic; }
            set
            {
                _nodePic = value;
                panPic.BackgroundImage = value;
            }
        }
        private List<UCTreeViewNode> m_nodes = new List<UCTreeViewNode>();
        /// <summary>
        /// 子节点
        /// </summary>
        public List<UCTreeViewNode> Nodes
        {
            get { return m_nodes; }
            set { m_nodes = value; }
        }

        private UCTreeViewNode m_parentNode;
        /// <summary>
        /// 父节点
        /// </summary>
        public UCTreeViewNode ParentNode
        {
            get { return m_parentNode; }
            set { m_parentNode = value; }
        }

        private Color _nodeForeColor = Color.Silver;
        /// <summary>
        /// 字体颜色
        /// </summary>
        public Color NodeForeColor
        {
            get { return _nodeForeColor; }
            set
            {
                _nodeForeColor = value;
                lblName.ForeColor = value;
            }
        }

        private bool _isShowSplitLine = false;
        /// <summary>
        /// 是否显示分割线
        /// </summary>
        public bool IsShowSplitLine
        {
            get { return _isShowSplitLine; }
            set
            {
                _isShowSplitLine = value;
                base.Redraw = value;
            }
        }

        private Color _splitLineColor= Color.FromArgb(54, 53, 58);
        /// <summary>
        /// 分割线颜色
        /// </summary>
        public Color SplitLineColor
        {
            get { return _splitLineColor; }
            set
            {
                _splitLineColor = value;
                base.BottomborderStyleColor = value;
            }
        }


        /// <summary>
        /// 点击节点事件
        /// </summary>
        public event EventHandler NodeMouseDown;
        #endregion

        public UCTreeViewNode()
        {
            InitializeComponent();
            lblName.MouseDown += Node_MouseDown;
            lblUpDownPic.MouseDown += Node_MouseDown;
        }

        void Node_MouseDown(object sender, MouseEventArgs e)
        {
            if (NodeMouseDown != null && Source.IsEventClick)
            {
                NodeMouseDown(this, e);
            }

            Expanded(!IsExpanded);
        }

        /// <summary>
        /// 功能描述:展开节点
        /// 作　　者:
        /// 创建日期:2018-06-26 17:53:45
        /// 任务编号:
        /// </summary>
        public void Expanded(bool blnExpanded = true)
        {
            if (CanExpand)
            {
                if (Nodes.Count > 0)
                {
                    foreach (var item in Nodes)
                    {
                        // item.Visible = blnExpanded;
                        if (blnExpanded)
                        {
                            item.Height = _nodeHeight;
                        }
                        else
                        {
                            item.Height = 0;
                            item.ExpandedAll(false);
                        }
                    }
                    IsExpanded = blnExpanded;
                    if (blnExpanded)
                    {
                        lblUpDownPic.Image = UpPic;
                        if (_isBrotherSingleExpanded)
                        {
                            //兄弟节点仅展开一个时，关闭其他节点
                            foreach (var item in ParentNode.Nodes)
                            {
                                if (item == this)
                                    continue;
                                item.ExpandedAll(false);
                            }
                        }
                    }
                    else
                    {
                        lblUpDownPic.Image = DownPic;
                    }
                }
            }
        }

        /// <summary>
        /// 功能描述:展开所有子节点
        /// 作　　者:
        /// 创建日期:2018-06-26 17:53:45
        /// 任务编号:
        /// </summary>
        public void ExpandedAll(bool blnExpanded = true)
        {
            if (CanExpand && (!_isBrotherSingleExpanded || !blnExpanded))
            {
                foreach (var item in Nodes)
                {
                    //item.Visible = blnExpanded;
                    if (blnExpanded)
                    {
                        item.Height = _nodeHeight;
                    }
                    else
                    {
                        item.Height = 0;
                    }
                    item.ExpandedAll(blnExpanded);
                }
                if (Nodes.Count > 0)
                {
                    IsExpanded = blnExpanded;

                    if (blnExpanded)
                    {
                        lblUpDownPic.Image = UpPic;
                    }
                    else
                    {
                        lblUpDownPic.Image = DownPic;
                    }
                }
            }
        }
    }

 另外需要重写Onpaint事件

 protected override void OnPaint(PaintEventArgs e)
        {
            if (_redraw && !_isShowRect)
            {
                e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
                ControlPaint.DrawBorder(e.Graphics,
                                  this.ClientRectangle,
                                 _leftborderStyleColor,//7f9db9
                                  _leftborderStyleSize,
                                   _leftborderStyleType,
                                  _topborderStyleColor,//7f9db9
                                   _topborderStyleSize,
                                   _topborderStyleType,
                                 _rightborderStyleColor,//7f9db9
                                  _rightborderStyleSize,
                                  _rightborderStyleType,
                                 _bottomborderStyleColor,//7f9db9
                                  _bottomborderStyleSize,
                                   _bottomborderStyleType);
            }

            base.OnPaint(e);
        }

下面是树控件

设计文件

 partial class UCTreeView
    {
        /// <summary> 
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary> 
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region 组件设计器生成的代码

        /// <summary> 
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.panSources = new System.Windows.Forms.FlowLayoutPanel();
            this.SuspendLayout();
            // 
            // panSources
            // 
            this.panSources.BackColor = System.Drawing.Color.Transparent;
            this.panSources.Dock = System.Windows.Forms.DockStyle.Fill;
            this.panSources.Location = new System.Drawing.Point(0, 0);
            this.panSources.Name = "panSources";
            this.panSources.Size = new System.Drawing.Size(159, 485);
            this.panSources.TabIndex = 0;
            // 
            // UCTreeView
            // 
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
            this.BackColor = System.Drawing.Color.White;
            this.Controls.Add(this.panSources);
            this.Name = "UCTreeView";
            this.Size = new System.Drawing.Size(159, 485);
            this.Resize += new System.EventHandler(this.UCTreeView_Resize);
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.FlowLayoutPanel panSources;


    }

代码文件

 public partial class UCTreeView : UserControl
    {
        #region 属性
        private bool _isBrotherSingleExpanded = true;
        /// <summary>
        /// 兄弟节点是否仅有一个为展开状态
        /// </summary>
        [Description("兄弟节点是否仅有一个为展开状态"), Category("自定义属性")]
        public bool IsBrotherSingleExpanded
        {
            get { return _isBrotherSingleExpanded; }
            set { _isBrotherSingleExpanded = value; }
        }

        private List<TreeNodeModel> _dataSource;
        /// <summary>
        /// 数据源
        /// </summary>
        public List<TreeNodeModel> DataSource
        {
            get { return _dataSource; }
            set
            {
                _dataSource = value;
                RefreshTree();
            }
        }

        private Image _nodeDownPic = Properties.Resources.下翻;
        /// <summary>
        /// 下翻图标
        /// </summary>
        [Description("下翻图标"), Category("自定义属性")]
        public Image NodeDownPic
        {
            get { return _nodeDownPic; }
            set { _nodeDownPic = value; }
        }

        private Image _nodeUpPic = Properties.Resources.上翻;
        /// <summary>
        /// 上翻图标
        /// </summary>
        [Description("上翻图标"), Category("自定义属性")]
        public Image NodeUpPic
        {
            get { return _nodeUpPic; }
            set { _nodeUpPic = value; }
        }

        private Color _nodeBackgroundColor = Color.White;
        /// <summary>
        /// 节点背景颜色(如果数据源中设置了指定节点背景颜色，则优先使用数据源中的背景颜色)
        /// </summary>
        [Description("节点背景颜色(如果数据源中设置了指定节点背景颜色，则优先使用数据源中的背景颜色)"), Category("自定义属性")]
        public Color NodeBackgroundColor
        {
            get { return _nodeBackgroundColor; }
            set { _nodeBackgroundColor = value; }
        }

        private int _nodeHeight = 65;
        /// <summary>
        /// 节点高度(如果数据源中设置了指定节点高度，则优先使用数据源中的高度)
        /// </summary>
        [Description("节点高度(如果数据源中设置了指定节点高度，则优先使用数据源中的高度)"), Category("自定义属性")]
        public int NodeHeight
        {
            get { return _nodeHeight; }
            set { _nodeHeight = value; }
        }

        private int _nodeLeftPadding = 20;
        /// <summary>
        /// 子节点与父节点间偏移距离
        /// </summary>
        [Description("子节点与父节点间偏移距离"), Category("自定义属性")]
        public int NodeLeftPadding
        {
            get { return _nodeLeftPadding; }
            set { _nodeLeftPadding = value; }
        }

        private Color _nodeForeColor = Color.Silver;
        /// <summary>
        /// 子节点字体颜色(如果数据源中设置了指定节点字体颜色，则优先使用数据源中的字体颜色)
        /// </summary>
        [Description("子节点字体颜色(如果数据源中设置了指定节点字体颜色，则优先使用数据源中的字体颜色)"), Category("自定义属性")]
        public Color NodeForeColor
        {
            get { return _nodeForeColor; }
            set { _nodeForeColor = value; }
        }
        private bool _nodeIsShowSplitLine = false;
        /// <summary>
        /// 是否显示分割线
        /// </summary>
        [Description("节点是否显示分割线"), Category("自定义属性")]
        public bool NodeIsShowSplitLine
        {
            get { return _nodeIsShowSplitLine; }
            set
            {
                _nodeIsShowSplitLine = value;
            }
        }

        private Color _nodeSplitLineColor = Color.FromArgb(54, 53, 58);
        /// <summary>
        /// 分割线颜色
        /// </summary>
        [Description("节点分割线颜色"), Category("自定义属性")]
        public Color NodeSplitLineColor
        {
            get { return _nodeSplitLineColor; }
            set
            {
                _nodeSplitLineColor = value;
            }
        }
        #endregion

        /// <summary>
        /// 节点点击事件
        /// </summary>
        [Description("节点点击事件"), Category("自定义")]
        public event EventHandler NodeMouseDown;

        /// <summary>
        /// 功能描述:构造函数
        /// 作　　者:
        /// 创建日期:2018-06-26 16:58:51
        /// 任务编号:
        /// </summary>
        public UCTreeView()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 功能描述:刷新列表
        /// 作　　者:
        /// 创建日期:2018-06-26 16:58:39
        /// 任务编号:
        /// </summary>
        public void RefreshTree()
        {
            this.panSources.Controls.Clear();
            if (_dataSource == null || _dataSource.Count <= 0)
            {
                return;
            }
            int intTabIndex = 0;
            UCTreeViewNode nodeBase = new UCTreeViewNode();
            nodeBase.Tag = 0;
            LoadNode(nodeBase, _dataSource, ref intTabIndex, true);
        }

        /// <summary>
        /// 功能描述:加载节点
        /// 作　　者:
        /// 创建日期:2018-06-27 09:37:45
        /// 任务编号:
        /// </summary>
        /// <param name="parentNode">parentNode</param>
        /// <param name="lstNodes">lstNodes</param>
        /// <param name="intTabIndex">intTabIndex</param>
        /// <param name="blnVisible">blnVisible</param>
        private void LoadNode(
            UCTreeViewNode parentNode,
            List<TreeNodeModel> lstNodes,
            ref int intTabIndex,
            bool blnVisible = false)
        {
            for (int i = 0; i < lstNodes.Count; i++)
            {
                var item = lstNodes[i];
                UCTreeViewNode node = new UCTreeViewNode();
                node.IsShowSplitLine = _nodeIsShowSplitLine;
                node.SplitLineColor = _nodeSplitLineColor;
                node.Tag = parentNode.Tag.ToIntExt() + 1;
                node.ParentNode = parentNode;
                node.UpPic = _nodeUpPic;
                node.DownPic = _nodeDownPic;
                node.Margin = new System.Windows.Forms.Padding(0);
                node.NodeLeftPadding = _nodeLeftPadding * parentNode.Tag.ToIntExt();
                node.NodeMouseDown += node_NodeMouseDown;
                node.Anchor = AnchorStyles.Left | AnchorStyles.Right;
                node.Size = new System.Drawing.Size(this.Width, blnVisible ? (item.NodeHeight.HasValue ? item.NodeHeight.Value : _nodeHeight) : 0);
                node.NodeBackgroundColor = _nodeBackgroundColor;
                node.NodeForeColor = item.NodeForeColor == Color.Empty ? _nodeForeColor : item.NodeForeColor;

                node.TabIndex = ++intTabIndex;
                node.IsBrotherSingleExpanded = _isBrotherSingleExpanded;
                node.NodeHeight = (item.NodeHeight.HasValue ? item.NodeHeight.Value : _nodeHeight);
                parentNode.Nodes.Add(node);
                this.panSources.Controls.Add(node);
                Console.WriteLine(item.NodeText);
                if (item.Nodes != null && item.Nodes.Count > 0)
                {
                    LoadNode(node, item.Nodes, ref intTabIndex, false);
                }
                node.Source = item;
            }
        }

        /// <summary>
        /// 功能描述:节点点击事件
        /// 作　　者:
        /// 创建日期:2018-06-27 09:31:44
        /// 任务编号:
        /// </summary>
        /// <param name="sender">sender</param>
        /// <param name="e">e</param>
        void node_NodeMouseDown(object sender, EventArgs e)
        {
            if (NodeMouseDown != null)
            {
                NodeMouseDown(sender, e);
            }
        }

        /// <summary>
        /// 改变大小时改变子项宽度，防止流控件横向显示多个
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void UCTreeView_Resize(object sender, EventArgs e)
        {
            this.SuspendLayout();
            for (int i = this.panSources.Controls.Count-1; i >=0; i--)
            {
                   this.panSources.Controls[i].Width = this.Width;
            }           
            this.ResumeLayout(false);
        }

    }

代码中用到了其他一些自定义控件，替换为常规控件即可

调用如下

 private void TestTreeView_Load(object sender, EventArgs e)
        {
            List<TreeNodeModel> lst = new List<TreeNodeModel>();
            for (int i = 0; i < 5; i++)
            {
                TreeNodeModel node = new TreeNodeModel()
                {
                    CanExpand = true,
                    DataSource = i,
                    NodeBackgroundColor = Color.FromArgb(61, 60, 65),
                    NodeText = string.Format("节点{0}", i),
                    NodelPic = Properties.Resources.Exit
                };
                for (int j = 0; j < 5; j++)
                {
                    TreeNodeModel node2 = new TreeNodeModel()
                    {
                        CanExpand = true,
                        DataSource = j,
                        NodeForeColor = Color.Black,
                        NodelPic = Properties.Resources.add,
                        NodeText = string.Format("节点{0}-{1}", i, j)
                    };
                    for (int k = 0; k < 5; k++)
                    {
                        TreeNodeModel node3 = new TreeNodeModel()
                        {
                            CanExpand = true,
                            DataSource = k,
                            NodeForeColor = Color.Black,
                            NodeText = string.Format("节点{0}-{1}-{2}", i, j, k)
                        };
                        node2.Nodes.Add(node3);
                    }
                    node.Nodes.Add(node2);
                }
                lst.Add(node);
            }
            this.ucTreeView1.DataSource = lst;
        }

        private void ucTreeView1_NodeMouseDown(object sender, EventArgs e)
        {
            UCTreeViewNode node = sender as UCTreeViewNode;
            TreeNodeModel model = node.Source;
        }

支持设置每个节点颜色，字体颜色，图标，展开关闭图标，是否显示分割线及颜色

效果如下