selectpt.aspx.cs

基于VS05和SQL05做的一个电子商务网站

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 SelectPT : System.Web.UI.Page
{
    public SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["ConnStr"]);
    public string strName;
    public string strID;
    
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (Session["username"] == null)
            {
                Response.Redirect("User_login.aspx?msg=" + Server.UrlEncode("SelectPT.aspx"));
            }
            //连续选中
            if (ListBoxDateBind(ListBox1, "0"))
                if (ListBoxDateBind(ListBox2, ListBox1.SelectedValue))
                    if (ListBoxDateBind(ListBox3, ListBox2.SelectedValue))
                        if (ListBoxDateBind(ListBox4, ListBox3.SelectedValue))
                            ListBoxDateBind(ListBox5, ListBox4.SelectedValue);
            SelectName();
        }
    }
    private bool ListBoxDateBind(ListBox ListBox, string strID)//ListBox控件的数据绑定
    {
        String sql = "SELECT * FROM PType where parentId=" + strID;
        SqlCommand command = new SqlCommand(sql, conn);
        try
        {
            conn.Open();
            SqlDataReader dr = command.ExecuteReader();
            ListBox.DataSource = dr;
            ListBox.DataValueField = "category_ID";
            ListBox.DataTextField = "category_name";
            ListBox.DataBind();
            ListBox.SelectedIndex = 0; //默认选中第一个选项
            dr.Close();
        }
        catch
        {
            return false;
        }
        finally
        {
            conn.Close();
        }
        return true;
    }

    private void SelectName()//获取选中的 类别名称和编号
    {
        if (ListBox1.SelectedIndex > -1)
        {
            strName = ListBox1.SelectedItem.Text + ">>";
            strID = ListBox1.SelectedValue;
        }
        if (ListBox2.SelectedIndex > -1)
        {
            strName += ListBox2.SelectedItem.Text + ">>";
            strID = ListBox2.SelectedValue;
        }
        if (ListBox3.SelectedIndex > -1)
        {
            strName += ListBox3.SelectedItem.Text + ">>";
            strID = ListBox3.SelectedValue;
        }
        if (ListBox4.SelectedIndex > -1)
        {
            strName += ListBox4.SelectedItem.Text + ">>";
            strID = ListBox4.SelectedValue;
        }
        if (ListBox5.SelectedIndex > -1)
        {
            strName += ListBox5.SelectedItem.Text;
            strID = ListBox5.SelectedValue;
        }
    }

    protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (ListBoxDateBind(ListBox2, ListBox1.SelectedValue))
            if (ListBoxDateBind(ListBox3, ListBox2.SelectedValue))
                if (ListBoxDateBind(ListBox4, ListBox3.SelectedValue))
                    ListBoxDateBind(ListBox5, ListBox4.SelectedValue);
        SelectName();
    }
    protected void ListBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (ListBoxDateBind(ListBox3, ListBox2.SelectedValue))
            if (ListBoxDateBind(ListBox4, ListBox3.SelectedValue))
                ListBoxDateBind(ListBox5, ListBox4.SelectedValue);
        SelectName();
    }
    protected void ListBox3_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (ListBoxDateBind(ListBox4, ListBox3.SelectedValue))
            ListBoxDateBind(ListBox5, ListBox4.SelectedValue);
        SelectName();
    }
    protected void ListBox4_SelectedIndexChanged(object sender, EventArgs e)
    {
        ListBoxDateBind(ListBox5, ListBox4.SelectedValue);
        SelectName();
    }
    protected void ListBox5_SelectedIndexChanged(object sender, EventArgs e)
    {
        SelectName();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        SelectName();
        Response.Redirect("product_add.aspx?categoryid=" + strID + "&categoryname=" +
            Server.UrlEncode(strName));
    }
}