TreeView学习笔记20091114：遍历树（叶子节点设置多选框）并设置展开级别

使用环境Visual Studio 2005，程序asp.net，Web，语言C#

 

1、动态绑定的TreeView，叶子节点需要加多选框，相关代码如下：

        private void TraverseTree()
        {
            foreach (TreeNode parentNode in TreeView1.Nodes)
            {
                if (parentNode.ChildNodes.Count != 0)
                {
                    foreach (TreeNode childNode in parentNode.ChildNodes)
                    {
                        if (childNode.ChildNodes.Count == 0)
                        {
                            childNode.ShowCheckBox = true;
                        }
                        else
                        {
                            TraverseChildTree(childNode);    //遍历子节点
                           }
                    }
                }
            }

        }

        private void TraverseChildTree(TreeNode node)
        {
            foreach (TreeNode child in node.ChildNodes)
            {
                if (child.ChildNodes.Count == 0)
                {
                    child.ShowCheckBox = true;
                }
                else
                {
                    TraverseChildTree(child);
                }
            }
        }

2、取上述步骤中多选框的值

        private string productValue = string.Empty;

        //绑定数据，并设置叶子节点的多选框
         TraverseTree(false);

        #region 遍历树
        private void TraverseTree(bool IsGetCheckedValue)
        {
            foreach (TreeNode parentNode in TreeView1.Nodes)
            {
                if (parentNode.ChildNodes.Count != 0)
                {
                    foreach (TreeNode childNode in parentNode.ChildNodes)
                    {
                        if (childNode.ChildNodes.Count == 0)
                        {
                            if (IsGetCheckedValue)
                            {
                                if (childNode.Checked)
                                {
                                    productValue += childNode.Text + ",";
                                }
                            }
                            else
                            {
                                childNode.ShowCheckBox = true;
                            }
                        }
                        else
                        {
                            TraverseChildTree(childNode, IsGetCheckedValue);    //遍历子节点
                        }
                    }
                }
            }

        }

        private void TraverseChildTree(TreeNode node, bool IsGetCheckedValue)
        {
            foreach (TreeNode child in node.ChildNodes)
            {
                if (child.ChildNodes.Count == 0)
                {
                    if (IsGetCheckedValue)
                    {
                        if (child.Checked)
                        {
                            productValue += child.Text + ",";
                        }
                    }
                    else
                    {
                        child.ShowCheckBox = true;
                    }
                }
                else
                {
                    TraverseChildTree(child, IsGetCheckedValue);
                }
            }
        }

        #endregion

        //获取遍历树后的选中框的值
         TraverseTree(true);
        hdfValue.Value = productValue;     //隐藏控件，获取值，以便传到指定页面
        if (!string.IsNullOrEmpty(hdfValue.Value))
        {
            hdfValue.Value = hdfValue.Value.Substring(0, hdfValue.Value.Length - 2);
        }

3、绑定TreeView后，设置展开长度

                TreeView1.ExpandDepth = 1;   //设置TreeView的展开级别

 此外，还有方法ExpandAll()和CollapseAll()，效果是：展开所有节点和合并所有节点。