default.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    SqlConnection conn;
    SqlDataAdapter da;
    DataSet ds;
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void tvTest_TreeNodePopulate(object sender, TreeNodeEventArgs e)
    {
        switch (e.Node.Depth)
        {
            case 0:
                ParentTree(e.Node);
                break;
            case 1:
                ChildTree(e.Node);
                break;
            default:
                break;
        }
    }
    /// <summary>
    /// 动态填充父节点
    /// </summary>
    /// <param name="node">TreeView控件的节点</param>
    public void ParentTree(TreeNode node)
    {
        DataSet ResultSet = RunQuery("Select deptID, deptName From tb_Department ");
        if (ResultSet.Tables.Count > 0)
        {
            foreach (DataRow row in ResultSet.Tables[0].Rows)
            {
                TreeNode NewNode = new TreeNode(row["deptName"].ToString(), row["deptID"].ToString());
                NewNode.PopulateOnDemand = true;
                NewNode.SelectAction = TreeNodeSelectAction.Expand;
                node.ChildNodes.Add(NewNode);
            }
        }
    }
    /// <summary>
    /// 动态填充子节点
    /// </summary>
    /// <param name="node">TreeView控件的节点</param>
    public void ChildTree(TreeNode node)
    {
        DataSet ResultSet = RunQuery("Select className From tb_Class Where deptID=" + node.Value);
        if (ResultSet.Tables.Count > 0)
        {
            foreach (DataRow row in ResultSet.Tables[0].Rows)
            {
                TreeNode NewNode = new TreeNode(row["className"].ToString());
                NewNode.PopulateOnDemand = false;
                NewNode.SelectAction = TreeNodeSelectAction.None;
                node.ChildNodes.Add(NewNode);
            }
        }
    }
    /// <summary>
    /// 查询结果
    /// </summary>
    /// <param name="str">查询字符串</param>
    /// <returns name="DataSet">DataSet数据集</returns>
    public DataSet RunQuery(string str)
    {
        conn = new SqlConnection("server=MRLFL\\MRLFL;uid=sa;pwd=;database=db_22");
        da = new SqlDataAdapter(str, conn);
        ds = new DataSet();
        da.Fill(ds);
        return ds;
    }
}