c# , net 创建树形结构,创建树形节点

/// <summary>
/// 生成树形结构
/// </summary>
public void GetTreeNode()
{
    //SqlHelper.GetSqlDataReader是封装的查询数据库语句,可根据自己需求封装
    //假设获取所有一级节点
    List<Products> products = SqlHelper.GetSqlDataReader(sql);
    for (int i = 0; i < products.Count; i++)
    {
        TreeNode tree = new TreeNode()
        {
            Name = products[i].ProductId.ToString(),
            Text = products[i].ProductName
        };
        //假设根据一级节点CategoryId获取二级节点
        List<SalesPerson> salesPerson = SqlHelper.GetSqlDataReader(products[i].CategoryId.ToString());
        for (int j = 0; j < salesPerson.Count; j++)
        {
            tree.Nodes.Add(new TreeNode()
            {
                Name= salesPerson[j].SalesPersonId.ToString(),
                Text = salesPerson[j].SPName,
                ForeColor=Color.Blue
            });
            //获取一级节点ProductId获取三级节点
            List<SMMembers> sMMembers = SqlHelper.GetSqlDataReader(products[i].ProductId.ToString());
            for(int k = 0; k < sMMembers.Count; k++)
            {
                tree.Nodes[j].Nodes.Add(new TreeNode()
                {
                    Name = sMMembers[k].MemberId.ToString(),
                    Text= sMMembers[k].MemberName,
                    Tag = sMMembers[k].MemberStatus,
                    ForeColor=Color.Red //设置颜色
                });
            };
        }

        this.tvTreeNode.Nodes.Add(tree); //将节点数据添加到treeView控件中
    }
    this.tvTreeNode.ExpandAll(); //展开所有节点

}