如何在winform程序中实现treeview的多选，在线

[lyl_rabbit]

如何在winform程序中实现treeview的多选，如先按住CTRL再点选多个节点，实现所点选的多个节点同时选中

[jimmyzhang]

自已先試試,再回答你!

[sunyou]

应该不行的。

[mobydick]

只能把节点变成checkbox，然后钩选。

[youwanna]

gz

[雪狼1234567]

原来的没有，不过你可以继承后然后重写几个方法就可以实现啦，只要比较麻烦，用checkbox是一个不错的方法，或者用LISTVIEW

[lyl_rabbit]

已解决，代码如下：

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;
using System.Text;

namespace WindowsApplication12
{
public delegate void TreeNodeDoubleClickHandle(object sender, EventArgs args);
public delegate void TreeNodeChangedHandle(object sender, EventArgs args);

/// <summary>
/// WITPLMMultiSelectTreeView 的摘要说明。
/// </summary>
[Serializable]
public class WITPLMMultiSelectTreeView : TreeView
{
public event TreeNodeDoubleClickHandle TreeNodeDoubleClick;
public event TreeNodeChangedHandle TreeNodeChanged;

private ArrayList selectedNodes = new ArrayList();
private bool isMulSelect = false;
private TreeNode currentNode = null;

public WITPLMMultiSelectTreeView()
{
}

public virtual void Initialize()
{
this.Sorted = false;
this.ShowRootLines = false;
this.Indent = 15;
this.ItemHeight = 18;
// this.ImageList = PLMService.ResourceService.ImageList;
}

/// <summary>
/// 获取当前节点
/// </summary>
public TreeNode CurrentNode
{
get
{
return currentNode;
}
}

/// <summary>
/// 获取所选节点组
/// </summary>
public ArrayList SelectedNodes
{
get
{
return selectedNodes;
}
}

/// <summary>
/// 判断是否是多选
/// </summary>
public bool IsMulSelect
{
get
{
return isMulSelect;
}
set
{
isMulSelect = value;
}
}

/// <summary>
/// 显示节点菜单
/// </summary>
protected virtual void ShowTreeNodeContextMenu()
{}

/// <summary>
/// 显示树菜单
/// </summary>
protected virtual void ShowTreeViewContextMenu()
{}

/// <summary>
/// 检测鼠标单击事件
/// </summary>
/// <param name="e"></param>
protected override void OnMouseDown(MouseEventArgs e)
{
TreeNode node = GetNodeAt(e.X, e.Y);
if(node != null)
{
if(isMulSelect)
{
if(!(selectedNodes.Count == 1 && selectedNodes[0] == node))
{
if(((Control.ModifierKeys & Keys.Shift) != 0 || (Control.ModifierKeys & Keys.Control) != 0))
MulSelectNode(node, e.Button == MouseButtons.Right);
else
SingleSelectNode(node);
}
}
else
SetCurrentNode(node);
}

if(e.Button == MouseButtons.Right)
{
if(node == null)
ShowTreeViewContextMenu();
else
ShowTreeNodeContextMenu();
}
else if(e.Clicks == 2 && node != null)
{
if(TreeNodeDoubleClick != null)
TreeNodeDoubleClick(node, EventArgs.Empty);
}
}

/// <summary>
/// 节点选择改变后执行
/// </summary>
/// <param name="e"></param>
protected override void OnAfterSelect(TreeViewEventArgs e)
{
SetCurrentNode(e.Node);
base.OnAfterCheck(e);
}

/// <summary>
/// 复选
/// </summary>
/// <param name="node"></param>
/// <param name="mustSelect"></param>
private void MulSelectNode(TreeNode node, bool mustSelect)
{
if(selectedNodes.Contains(node) && !mustSelect)
{
selectedNodes.Remove(node);
LowlightNode(node);
SetCurrentNode((TreeNode)selectedNodes[selectedNodes.Count - 1]);
}
else
{
selectedNodes.Add(node);
HighlightNode(node);
SetCurrentNode(node);
}
}

/// <summary>
/// 单选
/// </summary>
/// <param name="node"></param>
private void SingleSelectNode(TreeNode node)
{
foreach(TreeNode nd in SelectedNodes)
{
nd.BackColor = BackColor;
nd.ForeColor = ForeColor;
}
SelectedNodes.Clear();
SelectedNodes.Add(node);
HighlightNode(node);
SetCurrentNode(node);
}

/// <summary>
/// 设置当前节点
/// </summary>
/// <param name="node"></param>
private void SetCurrentNode(TreeNode node)
{
if(isMulSelect)
SelectedNode = null;
if(currentNode != node)
{
currentNode = node as TreeNode;
if(TreeNodeChanged != null)
TreeNodeChanged(currentNode, EventArgs.Empty);
// if(currentNode.Component != null)
// currentNode.Component.FireOperation(new ComponentOperationArgs(ComponentOperation.Selected));
}
}

/// <summary>
/// 取消当前节点的高亮显示
/// </summary>
/// <param name="node"></param>
private void LowlightNode(TreeNode node)
{
node.BackColor = BackColor;
node.ForeColor = SystemColors.ControlText;
}

/// <summary>
/// 高亮显示节点
/// </summary>
/// <param name="node"></param>
private void HighlightNode(TreeNode node)
{
node.BackColor = SystemColors.Highlight;
node.ForeColor = SystemColors.HighlightText;
}

}
}