TreeView 实例

一颗两层节点完全展开的TreeView树 

<div>
<table id ="tbl1" runat="server" >
<tr> 

<td>

<asp:TreeView ID ="treeVType" runat ="server" ExpandDepth="1" OnSelectedNodeChanged="treeVType_SelectedNodeChanged">
</asp:TreeView>

</td>

</tr>

</table>
</div>

后台 

///绑定树

 private void TreeDpTree()
    {
        treeVType.Nodes.Clear();
        Desktop.BLL.Type newtype = new Desktop.BLL.Type();
        DataSet ds = newtype.GetTypeWare();
        DataTable dt = ds.Tables[0];
        string typecode ="";

        TreeNode nodeParent = new TreeNode();
        TreeNode nodeRoot=new TreeNode() ;
        TreeNode node;
        TreeNode node3 = new TreeNode();
        if (dt.Rows.Count > 0)
        {
            nodeRoot.Text = "\\";
            nodeRoot.Value="";
            nodeRoot.Checked = true;
           
            foreach (DataRow var in dt.Rows)
            {
              
                if (typecode != var[0].ToString())
                {
                    if (typecode != "")
                    {
                        nodeRoot.ChildNodes.Add(nodeParent);
                        typecode = var[0].ToString();
                        nodeParent = new TreeNode();
                      
                       
                    }
                    nodeParent.Value = var["cType_code"].ToString();
                    nodeParent.Text = var["cType_name"].ToString();
                    typecode = var["cType_code"].ToString();

                    node = new TreeNode();
                    node.Value = var["cWare_code"].ToString();
                    node.Text = var["cWare_name"].ToString();
                    nodeParent.ChildNodes.Add(node);

                }
                else
                {
                    node = new TreeNode();
                    node.Value = var["cWare_code"].ToString();
                    node.Text = var["cWare_name"].ToString();
                    nodeParent.ChildNodes.Add(node);
                }
            }
            nodeRoot.ChildNodes.Add(nodeParent);
        }
       
        treeVType.Nodes.Add(nodeRoot);
        treeVType.ExpandAll();
    }