用户自定义控件的使用方法

来源：互联网发布：淘宝账号注册页面编辑：程序博客网时间：2024/04/29 15:04

简单的二级联动

控件内

public partial class citySelect : System.Web.UI.UserControl
{
    public event CitySelectHandler OnCitySelect;
    /// <summary>
    /// 获取用户选择的
    /// </summary>
    public string ProvinceCity
    {
        get
        {
            return this.DropDownList1.SelectedItem.Text +
                "(" +
                this.DropDownList1.SelectedValue +
                ");" +
                this.DropDownList2.SelectedItem.Text +
                "(" +
                this.DropDownList2.SelectedValue +
                ")";
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
            bindProvince();
    }
    private void bindProvince(){
        string str = System.Configuration.ConfigurationManager.ConnectionStrings["cnn"].ConnectionString;
        using(SqlConnection sqlcnn = new SqlConnection(str)){
            using(SqlCommand sqlcmm = sqlcnn.CreateCommand()){
                sqlcmm.CommandText = "select provinceid,province from province";
                sqlcnn.Open();
                DropDownList1.DataSource = sqlcmm.ExecuteReader();
                DropDownList1.DataTextField = "province";
                DropDownList1.DataValueField = "provinceid";
                DropDownList1.DataBind();
            }
        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e){
        this.DropDownList2.Items.Clear();
        string pid = this.DropDownList1.SelectedValue;
        string str = System.Configuration.ConfigurationManager.ConnectionStrings["cnn"].ConnectionString;
        using (SqlConnection sqlcnn = new SqlConnection(str)){
            using (SqlCommand sqlcmm = sqlcnn.CreateCommand()){
                sqlcmm.CommandText = "select cityid,city from city where father='" + pid + "'";
                sqlcnn.Open();
                DropDownList2.DataSource = sqlcmm.ExecuteReader();
                DropDownList2.DataTextField = "city";
                DropDownList2.DataValueField = "cityid";
                DropDownList2.DataBind();
            }
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        //Label lbl = this.Parent.FindControl("Label1") as Label;
        //lbl.Text = this.DropDownList2.SelectedItem.Text;
        if (OnCitySelect != null)
        {
            OnCitySelect(this, this.DropDownList2.SelectedItem.Text);
        }
    }
}
public delegate void CitySelectHandler(object sender,string selectCity);

在、程序内：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Src="~/MyMenu.ascx" TagName="MyMenu" TagPrefix="hbsi" %>
<%@ Register src="~/citySelect.ascx" TagName="city" TagPrefix="hbsi" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

sing System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.city1.OnCitySelect +=
            new CitySelectHandler(city1_OnCitySelect);
    }

    void city1_OnCitySelect(object sender, string selectCity)
    {
        this.Label1.Text = selectCity;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        #region 方法一
        ////DropDownList ddl = this.city1.FindControl("DropDownList1") as DropDownList;
        ////if (ddl != null)
        ////    this.Label1.Text = "省份：" + ddl.SelectedItem.Text + "(" + ddl.SelectedValue + ");";
        ////ddl = this.city1.FindControl("DropDownList2") as DropDownList;
        ////if (ddl != null)
        ////    this.Label1.Text += "城市：" + ddl.SelectedItem.Text + "(" + ddl.SelectedValue + ");";
        #endregion

this.Label1.Text = this.city1.ProvinceCity;
}
}