从一张表中动态生成多级别的树

最新推荐文章于 2024-12-11 20:26:13 发布

原创最新推荐文章于 2024-12-11 20:26:13 发布 · 432 阅读

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本文介绍了一种使用C#从数据库中获取数据并填充TreeView控件的方法。通过创建数据视图并设置过滤条件来显示顶级节点，然后递归地加载子节点，实现了层次结构的数据展示。

private void InTreeViwe()
    {
        DataTable dt = CreateTreeView();
        DataView dv = new DataView(dt);
        dv.RowFilter = "ParentID=0";
        TreeView1.ShowCheckBoxes = TreeNodeTypes.All;
        foreach (DataRowView drv in dv)
        {
            TreeNode node = new TreeNode();
            node.Text = drv["NAME"].ToString();
            node.Value = drv["ID"].ToString();
            node.Expanded = false;
            TreeView1.Nodes.Add(node);
            AddReplies(dt, node);
        }
    }

private DataTable CreateTreeView()
{

        string constring = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlConnection conn = new SqlConnection(constring);

        SqlDataAdapter da = new SqlDataAdapter("select * from QuHua", conn);
        DataTable dt = new DataTable();
        da.Fill(dt);
        return dt;
    }

private void AddReplies(DataTable dt, TreeNode node)
    {
        DataView dv = new DataView(dt);
        dv.RowFilter = "ParentID='" + node.Value + "'";
        foreach (DataRowView row in dv)
        {
            TreeNode replyNode = new TreeNode();
            replyNode.Text = row["NAME"].ToString();
            replyNode.Value = row["ID"].ToString();
            replyNode.Expanded = false;
            node.Expanded= false;
            node.ChildNodes.Add(replyNode);
            AddReplies(dt,replyNode);
        }
    }