timer控件:
实现时间日期自增长:
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace timer控件 { public partial class Form1 : Form { public Form1() { InitializeComponent(); label1.Text = DateTime.Now.ToString("yyyy年MM月dd日hh时mm分ss秒"); } //计时器 private void timer1_Tick(object sender, EventArgs e) { label1.Text = DateTime.Now.ToString("yyyy年MM月dd日hh时mm分ss秒"); } } }
抽奖设置,点击开始开始抽奖,开始按钮变为结束,点击结束,抽奖结束,结束按钮变为开始:
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace timer控件 { public partial class Form2 : Form { List<long> nu = new List<long>(); Random r = new Random(); public Form2() { InitializeComponent(); nu.Add(13969374807); nu.Add(13864311111); nu.Add(13864322222); nu.Add(13864333333); nu.Add(13864344444); } //抽奖 bool s = false; private void button1_Click(object sender, EventArgs e) { if (s)//结束抽奖 { button1.Text = "开始"; s = false; timer1.Enabled = false; } else//开始抽奖 { button1.Text = "停止"; s = true; timer1.Enabled = true; } } private void timer1_Tick(object sender, EventArgs e) { label2.Text= nu[r.Next(0,nu.Count)].ToString(); } } }
作弊:
在if结束抽奖中加一句代码:
label2.text="13969374807";
三级联动:
创建实体类:
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace 三级联动.App_Code { public class china { public string areacode { get; set; } public string areaname { get; set; } public string parentareacode { get; set; } } }
创建数据访问类:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.SqlClient; namespace 三级联动.App_Code { public class chinadata { SqlConnection conn = null; SqlCommand cmd = null; public chinadata() { conn = new SqlConnection("server=.;database=mydb;user=sa;pwd=123"); cmd = conn.CreateCommand(); } public List<china> select(string pcode) { List<china> clist = new List<china>(); cmd.CommandText = "select*from ChinaStates where [email protected]"; cmd.Parameters.Clear(); cmd.Parameters.Add("@a",pcode); conn.Open(); SqlDataReader dr = cmd.ExecuteReader(); if (dr.HasRows) { while (dr.Read()) { china c = new china(); c.areacode = dr[0].ToString(); c.areaname = dr[1].ToString(); c.parentareacode = dr[2].ToString(); clist.Add(c); } } conn.Close(); return clist; } } }
form1:使用selectedindexchanged事件,引用命名空间
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using 三级联动.App_Code; namespace 三级联动 { public partial class Form1 : Form { public Form1() { InitializeComponent(); //绑定省 comboBox1.DataSource = new chinadata().select("0001"); comboBox1.DisplayMember = "areaname"; comboBox1.ValueMember = "areacode"; //绑定市 comboBox2.DataSource = new chinadata().select(comboBox1.SelectedValue.ToString()); comboBox2.DisplayMember = "areaname"; comboBox2.ValueMember = "areacode"; //绑定区 comboBox3.DataSource = new chinadata().select(comboBox2.SelectedValue.ToString()); comboBox3.DisplayMember = "areaname"; comboBox3.ValueMember = "areacode"; } private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) { //绑定市跟随省移动 comboBox2.DataSource = new chinadata().select(comboBox1.SelectedValue.ToString()); comboBox2.DisplayMember = "areaname"; comboBox2.ValueMember = "areacode"; } private void comboBox2_SelectedIndexChanged(object sender, EventArgs e) { //绑定区跟随市移动 comboBox3.DataSource = new chinadata().select(comboBox2.SelectedValue.ToString()); comboBox3.DisplayMember = "areaname"; comboBox3.ValueMember = "areacode"; } } }
时间: 2024-10-13 17:38:50