Question

在与我的第一个TreeView挣扎之后，它几乎可以工作。我的问题是在Click事件中，在代码的底部，根节点似乎是集合中的唯一节点，这阻止我在检查根节点时检查所有节点。虽然我怀疑我可能错误地添加了节点，但我不知道我做了什么导致这种情况。树中有一个根节点和12个parentNode节点。每个parentNode都有多个secondChild节点。每个secondChild节点都有多个thirdChild节点。这是一个Windows窗体。这里列出了所有代码。任何帮助表示赞赏。

    public Form1()
    {
        InitializeComponent();

        FillTreeParentNodes();
    }

    public void FillTreeParentNodes()
    {
        connect.Open();

        DataTable dtGroups = new DataTable("FirstChildNodes");

        DataSet dsNodes = new DataSet();
        dsNodes.Tables.Add(dtGroups);

        SqlDataAdapter daAdapter = new SqlDataAdapter("RMM3DMTVColorDesc", connect);
        daAdapter.SelectCommand.CommandType = CommandType.StoredProcedure;
        daAdapter.Fill(dsNodes, "FirstChildNodes");
        daAdapter.Dispose();

        tvDiscountMaintenance.Nodes.Clear();

        if (dsNodes.Tables[0].Rows.Count > 0)
        {
            TreeNode root = new TreeNode("Select All");
            tvDiscountMaintenance.Nodes.Add(root);

            foreach (DataRow row in dsNodes.Tables[0].Rows)
            {

                TreeNode parentNode = new TreeNode(row["DisColorDesc"].ToString());
                parentNode.Text = row["DisColorDesc"].ToString();
                root.Nodes.Add(parentNode);

                FillChildNodes(parentNode, root);
            }
        }
    }

      private void FillChildNodes(TreeNode parentNode, TreeNode root)
    {

        DataTable dtSecondGroup = new DataTable("SecondChildNodes");

        DataSet dsCNodes = new DataSet();
        dsCNodes.Tables.Add(dtSecondGroup);

        SqlDataAdapter daAdapter = new SqlDataAdapter("RMM3DMTVColorCodes", connect);
        daAdapter.SelectCommand.CommandType = CommandType.StoredProcedure;
        daAdapter.Fill(dsCNodes, "SecondChildNodes");
        daAdapter.Dispose();

        if (dsCNodes.Tables[0].Rows.Count > 0)
        {
            foreach (DataRow chRow in dsCNodes.Tables[0].Rows)
            {
                if (parentNode.Text.Equals(chRow["DisColorDesc"].ToString()))
                {
                    TreeNode secondChild = new TreeNode();
                    secondChild.Text = chRow["DisColorCode"].ToString();
                    parentNode.Nodes.Add(secondChild);
                    FillThirdChildNodes(secondChild, root);
                }
            }
        }

    }

    private void FillThirdChildNodes(TreeNode secondChild, TreeNode root)
    {
        DataTable dtThirdGroup = new DataTable("ThirdChildNodes");

        DataSet dsThNodes = new DataSet();
        dsThNodes.Tables.Add(dtThirdGroup);

        SqlDataAdapter daAdapter = new SqlDataAdapter("RMM3DMTVCategories", connect);
        daAdapter.SelectCommand.CommandType = CommandType.StoredProcedure;
        daAdapter.Fill(dsThNodes, "ThirdChildNodes");
        daAdapter.Dispose();

        if (dsThNodes.Tables[0].Rows.Count > 0)
        {
            foreach (DataRow chRow in dsThNodes.Tables[0].Rows)
            {
                if (secondChild.Text.Equals(chRow["DisColorCode"].ToString()))
                {
                    TreeNode thirdChild = new TreeNode();
                    thirdChild.Text = chRow["DisCategoryDesc"].ToString;
                    secondChild.Nodes.Add(thirdChild);
                }
            }
        }
        connect.Close();
    }

    private void tvDiscountMaintenance_Click(object sender, EventArgs e)
    {
        if (tvDiscountMaintenance.Nodes.Count > 0) // I think this is telling me that the root node is the only one in the Collection.
        {
            if (tvDiscountMaintenance.TopNode.Checked)
            {
               foreach (TreeNode node in tvDiscountMaintenance.Nodes)
               {
                 node.ExpandAll();
                 node.Checked = true;
               }
            }
        }
    }

Answer 1

树视图的节点集合仅告诉您此集合中存在多少个节点，您将子节点添加到其他节点，因此要查看总共存在多少个节点，您必须遍历节点树。

如果您只想检查根节点内的节点，可以使用tvDiscountMaintenance.Nodes[0].Nodes

进行检查

childnodes不在TreeView集合中

1 个答案: