c# treeview问题，请高手帮忙！急急！

Question

我需要实现这样一个功能：    一个treeview中有两级节点，每个节点前都有复选框，当我选中根节点的时候，当前根节点下的所有子节点同时也被选中并且禁用所有子节点，当选择其中一个子节点时，他的根节点被选中。在选择节点时做判断，根节点最多能选择三项，子节点最多能选择两项！

Answer 1

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode tn = new TreeNode();
            tn.Name = "root";
            tn.Text = "一级节点";            TreeNode tn1 = new TreeNode();
            TreeNode tn2 = new TreeNode();
            TreeNode tn3 = new TreeNode();
            tn1.Text = "二级节点";
            tn2.Text = "二级节点";
            tn3.Text = "二级节点";            tn.Nodes.Add(tn1);
            tn.Nodes.Add(tn2);
            tn.Nodes.Add(tn3);            treeView1.Nodes.Add(tn);
            treeView1.ExpandAll();
        }
        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            TreeNode tn = e.Node;            if (tn.Checked)
            {
                if (tn.Name == "root")
                {
                    tn.Checked = true;
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        tn.Nodes[i].Checked = true;
                    }
                }
                else
                {
                    tn.Checked = true;
                    tn.Parent.Checked = true;
                }
            }
            else
            {
                if (tn.Name == "root")
                {
                    tn.Checked = false;
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        tn.Nodes[i].Checked = false;
                    }
                }
                else
                {
                    tn.Checked = false;
                    bool check = false;
                    for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                    {
                        if (tn.Parent.Nodes[i].Checked)
                        {
                            check=true;
                            break;
                        }
                    }                    if (!check)
                    {
                        tn.Parent.Checked = false;
                    }
                }
            
            }
        }
    }
}

Answer 2

用第三方控件！Devexpress！！里面的一个TreeList你看看，实现你这个应该不难

Answer 3

TreeView属性 checkboxes 设置 true

Answer 4

//这里是JQuery的语法，给TreeView控件的CheckBox加载事件
//当选中父节点时，子节点全选中；当不选择父节点，但选择一个子节点时，父节点默认也选中
<script>
$(document).ready(function()
{
var funcStr="$(\":checkbox\").click(function(){CheckedChildNode(this);});"; 
eval(funcStr); 
});
function valid()
{
  var ids="";
  for(var i=0;i<$("input:checked").size();i++)
  {
  ids+=$("input:checked").eq(i).val()+",";
  }
  if(ids=="")
  {
  return confirm("没选中任何信息,是否继续？");
  }
  return true;
}function CheckedChildNode(obj)
{
  var divs = obj.parentElement.parentElement.parentElement.parentElement.nextSibling;
  if(divs!=null && divs.tagName=="DIV")
  {
  divs=divs.getElementsByTagName("input");
  for(var i=0;i<divs.length;i++)
  {
  if(divs[i].type=="checkbox")
  {
  divs[i].checked=obj.checked;
  }
  }
  }
  if(obj.checked)
  {
  divs = obj.parentElement.parentElement.parentElement.parentElement.parentElement.previousSibling;
  var ips=divs.getElementsByTagName("input");
  for(var i=0;i<ips.length;i++)
  {
  if(ips[i].type=="checkbox")
  {
  ips[i].checked=obj.checked;
  }
  }
  while(divs.parentElement!=null)
  {
  divs=divs.parentElement;
  if(divs!=null && divs.tagName=="DIV")
  {
  divs=divs.previousSibling;
  var ips=divs.getElementsByTagName("input");
  for(var i=0;i<ips.length;i++)
  {
  if(ips[i].type=="checkbox")
  {
  ips[i].checked=obj.checked;
  }
  }
  }
  }
  }
}
</script>

Answer 5

Devexpress控件的效率不是很好。

Answer 6

好像没有禁用这个属性   可以控制点击无效using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode tn = new TreeNode();
            tn.Name = "root";
            tn.Text = "一级节点";
            tn.ToolTipText = "adfsfsdaf";
           
            TreeNode tn1 = new TreeNode();
            TreeNode tn2 = new TreeNode();
            TreeNode tn3 = new TreeNode();
            tn1.Text = "二级节点";
            tn2.Text = "二级节点";
            tn3.Text = "二级节点";
            
            tn.Nodes.Add(tn1);
            tn.Nodes.Add(tn2);
            tn.Nodes.Add(tn3);            treeView1.Nodes.Add(tn);
            treeView1.ExpandAll();
        }
        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            TreeNode tn = e.Node;            if (tn.ForeColor == Color.Gray)
            {
                return;
            
            }            if (tn.Checked)
            {
                if (tn.Name == "root")
                {
                    tn.Checked = true;
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        tn.Nodes[i].Checked = true;
                        tn.Nodes[i].ForeColor = Color.Gray;
                        tn.Nodes[i].BackColor = Color.White;
                    }
                }
                else
                {
                    tn.Checked = true;
                    tn.Parent.Checked = true;
                }
            }
            else
            {
                if (tn.Name == "root")
                {
                    tn.Checked = false;
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        tn.Nodes[i].Checked = false;
                        tn.Nodes[i].ForeColor = treeView1.ForeColor;
                        tn.Nodes[i].BackColor = treeView1.BackColor;
                    }
                }
                else
                {
                    tn.Checked = false;
                    bool check = false;
                    for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                    {
                        if (tn.Parent.Nodes[i].Checked)
                        {
                            check=true;
                            break;
                        }
                    }                    if (!check)
                    {
                        tn.Parent.Checked = false;
                    }
                }
            
            }
        }        private void treeView1_BeforeCheck(object sender, TreeViewCancelEventArgs e)
        {
            TreeNode tn = e.Node;
            if (tn.Parent==null)
            {
                return;
            }
            if (tn.Parent.Checked&&tn.ForeColor == Color.Gray)
            {
                e.Cancel = true;
                return;            }
        }
    }
}

Answer 7

在treeView1_BeforeCheck事件中 判断  不想让他点  e.Cancel = true; 就行了
 

Answer 8

还是不太明白，我现在是这样写的        private void tvTypeListSWYY_BeforeCheck(object sender, TreeViewCancelEventArgs e)
        {        }        private void tvTypeListSWYY_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            TreeNode tn = e.Node;            if (tn.Checked)
            {
                if (tn.Parent == null)
                {
                    tn.Checked = true;
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        tn.Nodes[i].Checked = true;
                        //需要在这里，把子节点禁用！但根节点不禁用，如果根节点取消选择的时候，子节点再启用！
                    }
                }
                else
                {
                    tn.Checked = true;
                    tn.Parent.Checked = true;
                                                            int j = 0;
                    for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                    {
                        if (tn.Parent.Nodes[i].Checked)
                        {
                            j++;
                            if (j > 2)
                            {
                                MessageBox.Show("小类最多选2项", "提示信息", MessageBoxButtons.OK);
                                tn.Parent.Nodes[i].Checked = false;
                                return;
                            }
                        }                    }
                }
            }
            else
            {
                if (tn.Parent == null)
                {
                    tn.Checked = false;
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        tn.Nodes[i].Checked = false;
                    }
                }
                else
                {
                    tn.Checked = false;
                    bool check = false;
                    for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                    {
                        if (tn.Parent.Nodes[i].Checked)
                        {
                            check = true;
                            break;
                        }
                    }                    if (!check)
                    {
                        tn.Parent.Checked = false;
                    }
                }
            }            int k = 0;
            for (int i = 0; i < tvTypeListSWYY.Nodes.Count; i++)
            {
                if (tvTypeListSWYY.Nodes[i].Checked)
                {
                    k++;
                    if (k > 3)
                    {
                        MessageBox.Show("大类最多选3项", "提示信息", MessageBoxButtons.OK);
                        tvTypeListSWYY.Nodes[i].Checked = false;
                        for (int j = 0; j < tvTypeListSWYY.Nodes[i].Nodes.Count; j++)
                        {
                            tvTypeListSWYY.Nodes[i].Nodes[j].Checked = false;
                        }
                        return;
                    }
                }
            }
        }

Answer 9

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        bool ischeck = false;
        bool ischeck2 = false;        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode tn = new TreeNode();
            tn.Name = "root";
            tn.Text = "一级节点1";            TreeNode tnn = new TreeNode();
            tnn.Text = "一级节点2";            TreeNode tnnn = new TreeNode();
            tnnn.Text = "一级节点3";            TreeNode tnnnn = new TreeNode();
            tnnnn.Text = "一级节点4";            TreeNode tn1 = new TreeNode();
            TreeNode tn2 = new TreeNode();
            TreeNode tn3 = new TreeNode();
            TreeNode tn4 = new TreeNode();
            TreeNode tn5 = new TreeNode();            tn1.Text = "二级节点";
            tn2.Text = "二级节点";
            tn3.Text = "二级节点";
            tn4.Text = "二级节点";
            tn5.Text = "二级节点";
            tn.Nodes.Add(tn1);
            tn.Nodes.Add(tn2);
            tn.Nodes.Add(tn3);
            tn.Nodes.Add(tn4);
            tn.Nodes.Add(tn5);            treeView1.Nodes.Add(tn);
            treeView1.Nodes.Add(tnn);
            treeView1.Nodes.Add(tnnn);
            treeView1.Nodes.Add(tnnnn);
            treeView1.ExpandAll();
        }
        private void treeView1_BeforeCheck(object sender, TreeViewCancelEventArgs e)
        {
            if (ischeck2)
            {
                return;
            }
            TreeNode tn = e.Node;
            if (tn.ForeColor == Color.Gray)
            {
                e.Cancel = true;
                return;
            }
        }        private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
        {
            if (ischeck)
            {
                return;
            }            TreeNode tn = e.Node;            if (tn.Level == 0)
            {                if (tn.Checked)
                {
                    int j = 0;
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        j++;
                        if (j <= 2)
                        {
                            tn.Nodes[i].Checked = true;
                        }
                        tn.Nodes[i].ForeColor = Color.Gray;
                        tn.Nodes[i].BackColor = Color.White;
                    }                }
                else
                {
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        ischeck2 = true;
                        tn.Nodes[i].Checked = false;
                        ischeck2 = false;
                        tn.Nodes[i].ForeColor = treeView1.ForeColor;
                        tn.Nodes[i].BackColor = treeView1.BackColor;
                    }
                }                int k = 0;
                for (int i = 0; i < treeView1.Nodes.Count; i++)
                {
                    if (treeView1.Nodes[i].Checked)
                    {
                        k++;
                    }
                }
                if (k >= 3)
                {
                    for (int i = 0; i < treeView1.Nodes.Count; i++)
                    {
                        if (!treeView1.Nodes[i].Checked)
                        {
                            treeView1.Nodes[i].ForeColor = Color.Gray;
                            treeView1.Nodes[i].BackColor = Color.White;
                        }
                    }                    return;
                }
                else
                {
                    for (int i = 0; i < treeView1.Nodes.Count; i++)
                    {
                        if (!treeView1.Nodes[i].Checked)
                        {
                            treeView1.Nodes[i].ForeColor = treeView1.ForeColor;
                            treeView1.Nodes[i].BackColor = treeView1.BackColor;
                        }
                    }
                }
            }            else
            {
                if (tn.Parent != null)
                {
                    ischeck = true;
                    tn.Parent.Checked = true;
                    ischeck = false;
                    int k = 0;
                    for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                    {
                        if (tn.Parent.Nodes[i].Checked)
                        {
                            k++;
                        }
                    }
                    if (k == 0)
                    {
                        ischeck = true;
                        tn.Parent.Checked = false;
                        ischeck = false;
                    }
                    if (k >= 2)
                    {
                        for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                        {
                            if (!tn.Parent.Nodes[i].Checked)
                            {
                                tn.Parent.Nodes[i].ForeColor = Color.Gray;
                                tn.Parent.Nodes[i].BackColor = Color.White;
                            }
                        }                        return;
                    }
                    else
                    {
                        for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                        {
                            if (!tn.Parent.Nodes[i].Checked)
                            {
                                tn.Parent.Nodes[i].ForeColor = treeView1.ForeColor;
                                tn.Parent.Nodes[i].BackColor = treeView1.BackColor;
                            }
                        }
                    }
                }            }
        }
    }
}

Answer 10

不好意思 误导你了 不应该写在NodeMouseClick事件中

Answer 11

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        bool ischeck = false;
        bool ischeck2 = false;        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode tn = new TreeNode();
            tn.Name = "root";
            tn.Text = "一级节点1";            TreeNode tnn = new TreeNode();
            tnn.Text = "一级节点2";            TreeNode tnnn = new TreeNode();
            tnnn.Text = "一级节点3";            TreeNode tnnnn = new TreeNode();
            tnnnn.Text = "一级节点4";            TreeNode tn1 = new TreeNode();
            TreeNode tn2 = new TreeNode();
            TreeNode tn3 = new TreeNode();
            TreeNode tn4 = new TreeNode();
            TreeNode tn5 = new TreeNode();            tn1.Text = "二级节点";
            tn2.Text = "二级节点";
            tn3.Text = "二级节点";
            tn4.Text = "二级节点";
            tn5.Text = "二级节点";
            tn.Nodes.Add(tn1);
            tn.Nodes.Add(tn2);
            tn.Nodes.Add(tn3);
            tn.Nodes.Add(tn4);
            tn.Nodes.Add(tn5);            treeView1.Nodes.Add(tn);
            treeView1.Nodes.Add(tnn);
            treeView1.Nodes.Add(tnnn);
            treeView1.Nodes.Add(tnnnn);
            treeView1.ExpandAll();
        }        private void treeView1_BeforeCheck(object sender, TreeViewCancelEventArgs e)
        {
            if (ischeck2)
            {
                return;
            }
            TreeNode tn = e.Node;
            if (tn.ForeColor == Color.Gray)
            {
                e.Cancel = true;
                return;
            }        }        private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
        {
            if (ischeck)
            {
                return;
            }            TreeNode tn = e.Node;            if (tn.Level == 0)
            {                if (tn.Checked)
                {
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        ischeck2 = true;
                        tn.Nodes[i].Checked = true;
                        ischeck2 = false;
                        tn.Nodes[i].ForeColor = Color.Gray;
                        tn.Nodes[i].BackColor = Color.White;
                    }                }
                else
                {
                    for (int i = 0; i < tn.Nodes.Count; i++)
                    {
                        ischeck2 = true;
                        tn.Nodes[i].Checked = false;
                        ischeck2 = false;
                        tn.Nodes[i].ForeColor = treeView1.ForeColor;
                        tn.Nodes[i].BackColor = treeView1.BackColor;
                    }
                }                int k = 0;
                for (int i = 0; i < treeView1.Nodes.Count; i++)
                {
                    if (treeView1.Nodes[i].Checked)
                    {
                        k++;
                    }
                }
                if (k >= 3)
                {
                    for (int i = 0; i < treeView1.Nodes.Count; i++)
                    {
                        if (!treeView1.Nodes[i].Checked)
                        {
                            treeView1.Nodes[i].ForeColor = Color.Gray;
                            treeView1.Nodes[i].BackColor = Color.White;
                        }
                    }                    return;
                }
                else
                {
                    for (int i = 0; i < treeView1.Nodes.Count; i++)
                    {
                        if (!treeView1.Nodes[i].Checked)
                        {
                            treeView1.Nodes[i].ForeColor = treeView1.ForeColor;
                            treeView1.Nodes[i].BackColor = treeView1.BackColor;
                        }
                    }
                }
            }            else
            {                if (ischeck2)
                {
                    return;
                }
                if (tn.Parent != null)
                {
                    ischeck = true;
                    tn.Parent.Checked = true;
                    ischeck = false;
                    int k = 0;
                    for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                    {
                        if (tn.Parent.Nodes[i].Checked)
                        {
                            k++;
                        }
                    }
                    if (k == 0)
                    {
                        ischeck = true;
                        tn.Parent.Checked = false;
                        ischeck = false;
                    }
                    if (k >= 2)
                    {
                        for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                        {
                            if (!tn.Parent.Nodes[i].Checked)
                            {
                                tn.Parent.Nodes[i].ForeColor = Color.Gray;
                                tn.Parent.Nodes[i].BackColor = Color.White;
                            }
                        }                        return;
                    }
                    else
                    {
                        for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                        {
                            if (!tn.Parent.Nodes[i].Checked)
                            {
                                tn.Parent.Nodes[i].ForeColor = treeView1.ForeColor;
                                tn.Parent.Nodes[i].BackColor = treeView1.BackColor;
                            }
                        }
                    }
                }
            }
        }
    }
}