protected void Page_Load(object sender, EventArgs e)
{
string connecting = System.Configuration.ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;
DataSet ds = new DataSet();
try
{
using (SqlConnection conn = new SqlConnection(connecting))
{
conn.Open();
string sql = "select * from dbo.Node";
using (SqlDataAdapter da = new SqlDataAdapter(sql, conn))
{
da.Fill(ds);
}
conn.Close();
}
}
catch (Exception err)
{
throw new Exception(err.Message + err.StackTrace);
}
//绑定一级节点 通过dataviw来实现
TreeNode firstNode = new TreeNode();
firstNode.Value = "-1";
firstNode.Text = "项目简介 ";
tvTreeView.Nodes.Add(firstNode);
DataView dv = ds.Tables[0].DefaultView;
dv.RowFilter = "NodeParentId='-1'";
foreach (DataRowView dr in dv)
{
TreeNode rootNode = new TreeNode();
rootNode.Text = dr["NodeName"].ToString();
rootNode.Value = dr["NodeId"].ToString();
tvTreeView.Nodes.Add(rootNode);
CreateChildNodes(rootNode.Value, ds.Tables[0], rootNode);
}
}
protected void CreateChildNodes(string parentId,DataTable dt,TreeNode parentNode)
{
DataView dv= dt.DefaultView;
dv.RowFilter = "NodeParentId='" +parentId+"'";
foreach (DataRowView dr in dv)
{
TreeNode childNode = new TreeNode();
childNode.Text = dr["NodeName"].ToString();
childNode.Value = dr["NodeId"].ToString();
parentNode.ChildNodes.Add(childNode);
CreateChildNodes(childNode.Value, dt, childNode);
}
}
}
第二种：
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string constring = System.Configuration.ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;
string sql = "select * from Node";
DataSet ds = new DataSet();
using (SqlConnection conn = new SqlConnection(constring))
{
conn.Open();
using (SqlDataAdapter da = new SqlDataAdapter(sql, conn))
{
da.Fill(ds);
}
conn.Close();
}
DataTable dt = ds.Tables[0];
TreeNode node = new TreeNode();
node.Text = "项目简介 ";
node.Value = "-1";
tvBind.Nodes.Add(node);
//绑定一级节点
//第一种方法用dataRow
DataRow[] rowlist = dt.Select("NodeParentId='-1'");
foreach (DataRow dr in rowlist)
{
TreeNode rootNode = new TreeNode();
rootNode.Value = dr["NodeID"].ToString();
rootNode.Text = dr["NodeName"].ToString();
rootNode.Expanded = false;
tvBind.Nodes.Add(rootNode);
CreateChildNode(rootNode, Convert.ToInt32(rootNode.Value), dt);
}
}
}
/// <summary>
/// 递归找出节点id
/// </summary>
/// <param name="node"></param>
/// <param name="nodeId"></param>
protected void CreateChildNode(TreeNode node,int parentId,DataTable dt)
{
DataRow[] rowList = dt.Select("NodeParentId='" + parentId + "'");
foreach (DataRow dr in rowList)
{
TreeNode childNode = new TreeNode();
childNode.Value = dr["NodeID"].ToString();
childNode.Text=dr["NodeName"].ToString();
node.ChildNodes.Add(childNode);
CreateChildNode(childNode, Convert.ToInt32(childNode.Value), dt);
}
}