用ASP.NET控件实现部门和员工的联动,参考过程如下
效果图:
Default.aspx代码:
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html> < html xmlns = "http://www.w3.org/1999/xhtml" > < head runat = "server" > < meta http-equiv = "Content-Type" content = "text/html; charset=utf-8" /> < title ></ title > </ head > < body > < form id = "form1" runat = "server" > < div > < asp:DropDownList ID = "ddlDep" runat = "server" AutoPostBack = "True" OnSelectedIndexChanged = "ddlDep_SelectedIndexChanged" > </ asp:DropDownList > < br /> < asp:ListBox ID = "lBoxEmp" runat = "server" ></ asp:ListBox > </ div > </ form > </ body > </ html > |
Default.aspx.cs代码:
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using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data.SqlClient; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!this.IsPostBack) { SqlConnection con = DBCon.createConnection(); con.Open(); //显示部门 SqlCommand cmd = new SqlCommand("select * from Tdepartment", con); SqlDataReader sdr = cmd.ExecuteReader(); this.ddlDep.DataSource = sdr; this.ddlDep.DataTextField = "depName"; this.ddlDep.DataValueField = "depID"; this.ddlDep.DataBind(); sdr.Close(); //显示员工 SqlCommand cmdEmp =new SqlCommand ("select * from emp where depID=" + this.ddlDep .SelectedValue ,con); SqlDataReader sdrEmp = cmdEmp.ExecuteReader(); while (sdrEmp.Read()) { this.lBoxEmp.Items.Add (new ListItem(sdrEmp.GetString(1),sdrEmp .GetInt32 (0).ToString ())); } sdrEmp.Close(); //关闭连接 con.Close(); } } protected void ddlDep_SelectedIndexChanged(object sender, EventArgs e) { this.lBoxEmp.Items.Clear(); SqlConnection con = DBCon.createConnection(); con.Open(); SqlCommand cmdEmp = new SqlCommand("select * from emp where depID=" + this.ddlDep.SelectedValue, con); SqlDataReader sdrEmp = cmdEmp.ExecuteReader(); while (sdrEmp.Read()) { this.lBoxEmp.Items.Add(new ListItem(sdrEmp.GetString(1), sdrEmp.GetInt32(0).ToString())); } sdrEmp.Close(); //关闭连接 con.Close(); } } |
DBCon.cs代码
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using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Data.SqlClient; /// < summary > /// DBCon 的摘要说明 /// </ summary > public class DBCon { public DBCon() { // // TODO: 在此处添加构造函数逻辑 // } public static SqlConnection createConnection() { SqlConnection con = new SqlConnection("server=.;database=department;uid=sa;pwd=123456"); return con; } } |
使用Asp.net控件实现比较简单,但在大量用户使用的情况下最好不要使用,不断向服务器请求会给服务器带来很大的负担。使用JQuery和ajax实现可以有动态效果,实现过程比较复杂,但有数据缓冲和ajax局部刷新可以减少服务器的负担,JQuery实现级联下拉框效果
以上就是ASP.NET实现级联下拉框效果实例讲解,希望大家可以学以致用。