C# 通过选中treeview的子节点复选框，将行添加到datagridview

我是C的新手，正在做第一个项目

我有一个显示treenode和datagridview的WINFORM。我希望从treenode中选择的项目转到datagridview。如果我选择treenode的父节点，所有子节点都将转到datagridview，但如果我只是展开父节点并选择其中一个子节点，则不会有任何内容转到datagrid。选择treenode会触发一个方法，从sql表中获取项的属性，这些属性会转到grid+节点值

选择父级时，“如果e.Node.Nodes.Count>0”为真。 未选择父项但子项为“如果e.Node.Nodes.Count>0”时为false

所以我的问题是，我需要什么代码来查找选中/未选中的子节点

一旦我得到了查找子节点检查的正确代码，如果未选中子节点，什么代码会将其移动到datagrid或从datagrid中删除

   private void getChildNodesToGrid()
    {
        // get all child nodes add to dataGridView
        DataTable dt = getFieldsTable();
        dgvColumns.DataSource = dt;
        getAttributeSIDs();
    }

private void tvFileMan_AfterCheck(object sender, TreeViewEventArgs e)
    {
        getFileAndColumns();
        if (e.Node.Nodes.Count > 0)
        {
           this.CheckAllChildNodes(e.Node, e.Node.Checked);
            // Checked a file so get fields and check all fields except subfiles.
            // Use this event handler to process actions from check box click
            e.Node.Expand();
            foreach (TreeNode tn in e.Node.Nodes)
            {
                if (tn.Nodes.Count.Equals(0))
                    tn.Checked = e.Node.Checked;
            }
            getChildNodesToGrid();
 }       

谢谢，但我已经有了所有这些，我正在把所有节点都放到网格中。我遇到的问题是仅限于filNode.nodes中的已检查子节点。我一直在玩“if fileNode.Checked”，但从来都不是真的，即使我可以在即时窗口中打印它

?fileNode.Nodes[2]
{Text = "1  - CARD COLOR"}
    base: {Text = "1  - CARD COLOR"}
    BackColor: "{Name=0, ARGB=(0, 0, 0, 0)}"
    Bounds: {X = 76 Y = 176 Width = 92 Height = 16}
    Checked: true





  private DataTable getFieldsTable()
    {
        //original
        DataTable dt = new DataTable();
        dt.Columns.Add("ColumnName");
        dt.Columns.Add("FMFieldName");
.
.
.
        dt.Columns.Add("PointsToFileNumber");
        TreeNode fileNode = tvFileMan.SelectedNode;
        foreach (TreeNode tn in fileNode.Nodes)
        {
            if (tn.Nodes.Count == 0)
            {   
                if (fileNode.Checked)
                {
                 DataRow dr = dt.NewRow();

                dr["FMFieldName"] = tn.Text.Substring(tn.Text.IndexOf("  - ") + 4);
                dr["FMFieldNumber"] = tn.Tag.ToString();
                dr["FMFileNumber"] = tn.Parent.Tag.ToString();
                dr["ColumnName"] = suggestName(tn.Text.Substring(tn.Text.IndexOf("  - ") + 4));
                //added by TEA 9/3/14 to get PointsToFileNumber in TreeNode
                if (dr["PointsToFileNumber"].ToString().Length > 0)
                {
                    dr["ColumnName"] = suggestName(tn.Text.Substring(tn.Text.IndexOf("  - ") + 4) + "txt");
                }
                dt.Rows.Add(dr);
                }
            }
        }
        return dt;

    }

---

将Datatable设置为私有成员变量，并在检查父节点时向其添加记录：

//The DataTable is now a private member variable and is accessible in the tvFileMan_AfterCheck event 
private DataTable dt = getFieldsTable();

private void getChildNodesToGrid()
   {
        dgvColumns.DataSource = dt; //this binds the DataTable to the GridView
        getAttributeSIDs();
    }

private void tvFileMan_AfterCheck(object sender, TreeViewEventArgs e)
    {
        getFileAndColumns();
        if (e.Node.Nodes.Count > 0)
        {
           this.CheckAllChildNodes(e.Node, e.Node.Checked);
            e.Node.Expand();
            foreach (TreeNode tn in e.Node.Nodes)
            {
                if (tn.Nodes.Count.Equals(0))
                    tn.Checked = e.Node.Checked;
            }

            //HERE Add the treenode(s) to the DataTable
            DataRow dr = dt.NewRow();
            dr[0] = "e.Node.Text";
            dt.Rows.Add(dr);

            getChildNodesToGrid();
 }       

---

在AfterCheck中添加了一个“else”，因此它只调用getChildNodesToGrid

然后，我更新了私有数据表getFieldsTable，添加了一个计数器和条件“if fileNode.Nodes[cnt].Checked”。同样，我不知道这是否是正确的编程，但似乎工作

    private void tvFileMan_AfterCheck(object sender, TreeViewEventArgs e)
    {
        getFileAndColumns();
        if (e.Node.Nodes.Count > 0)
        {
           //this.CheckAllChildNodes(e.Node, e.Node.Checked);
            // Checked a file so get fields and check all fields except subfiles.
            e.Node.Expand();
            foreach (TreeNode tn in e.Node.Nodes)
            {
                if (tn.Nodes.Count.Equals(0))
                    tn.Checked = e.Node.Checked;
            }
            getChildNodesToGrid();
        }
        else
        {
            e.Node.Expand();

                //if (tn.Nodes.Count.Equals(0))
                if (e.Node.Checked)
                {
                    //tn.Checked = e.Node.Checked;
                    getChildNodesToGrid();
                }

        }

   private DataTable getFieldsTable()
    {
        //original
        DataTable dt = new DataTable();
        dt.Columns.Add("ColumnName");
        dt.Columns.Add("FMFieldName");
        dt.Columns.Add("FMFieldNumber");
        dt.Columns.Add("FMFileNumber");
        dt.Columns.Add("FMFieldType");
        dt.Columns.Add("ResolvedValue");
        dt.Columns.Add("PointsToFileNumber");
        TreeNode fileNode = tvFileMan.SelectedNode;
        int cnt = 0;
        foreach (TreeNode tn in fileNode.Nodes)
        {
            if (tn.Nodes.Count == 0)
            {   
                if (fileNode.Nodes[cnt].Checked)
                {
                 DataRow dr = dt.NewRow();

                dr["FMFieldName"] = tn.Text.Substring(tn.Text.IndexOf("  - ") + 4);
                dr["FMFieldNumber"] = tn.Tag.ToString();
                dr["FMFileNumber"] = tn.Parent.Tag.ToString();
                dr["ColumnName"] = suggestName(tn.Text.Substring(tn.Text.IndexOf("  - ") + 4));
                //added by TEA 9/3/14 to get PointsToFileNumber in DataGrid
                if (dr["PointsToFileNumber"].ToString().Length > 0)
                {
                    dr["ColumnName"] = suggestName(tn.Text.Substring(tn.Text.IndexOf("  - ") + 4) + "txt");
                }
                dt.Rows.Add(dr);
                }
                cnt++;
            }
        }
        return dt;

    }
   private void getFileAndColumns()
    {
        label4.Visible = false;
        label5.Visible = false;
        btAllFields.Visible = false;
        cbComputed.Checked = false;
        TreeNode node = tvFileMan.SelectedNode;
        if (node == null) return;
        // Is it a File or Field?
        if (node.Index == 0) return;

        if (node.Nodes.Count > 0)
        {
            // FileManFile selected.
            // Check AttributeMap for this file. If found, fill in textboxes with that info.

            // Otherwise, suggest a name for the table.
            tbFileNumber.Text = node.Tag.ToString();
            tbFileName.Text = node.Text.Substring(node.Text.IndexOf("  - ") + 4);
            tbTableName.Text = "xxxx." + (suggestName(tbFileName.Text) + "F" + tbFileNumber.Text.Replace('.', 'x'));
            label4.Text = "To select all fields push button to the right. \nOtherwise double-click fields to add them one at a time.";
            label4.Visible = true;
            btAllFields.Visible = true;
            dgvColumns.DataSource = null;
            dgvPKIENS.DataSource = getPKIENSTable();
            getPKIENSIDs();
        }
        else
        {
            // FileMan Field selected.
        }


    }

---

谢谢，但是该表已经是私有的，并且已经添加了数据行。我编辑了上面的问题，以显示datatable和我遇到的困难。