combox下拉框控件
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace combox { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { //通过下拉框添加数据 comboBox2.Items.Add("张三"); comboBox2.Items.Add("李四"); comboBox2.Items.Add("王五"); } private void button2_Click(object sender, EventArgs e) { //清除成员 comboBox2.Items.Clear(); } } }
DropDownStyle:控制下拉框的外观
一般给combox控件起名字时候,用cbo+****
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace 日期选择器 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { //在程序加载的时候 将年份添加到下拉框当中 //因为年份的加载到我们现在的时候,所以要先获得当前的年份 int year = DateTime.Now.Year; for (int i = 1949; i <= year; i++) { cboYear.Items.Add(i + "年"); } } /// <summary> /// 当年份发生该改变的时候 加载月份 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void cboYear_SelectedIndexChanged(object sender, EventArgs e) { cboMonth.Items.Clear();//在每次点击选择年份的时候,应该把上一次的月份清空,不然会出现重复现象 //在点击年份下拉框选好之后,把月份加入 for (int i = 1; i <=12; i++) { cboMonth.Items.Add(i + "月"); } } /// <summary> /// 当月份发生改变的时候加载天数 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void cboMonth_SelectedIndexChanged(object sender, EventArgs e) { //在点击月份之前,清空天数 cboDay.Items.Clear(); //获取年份跟月份,以此来判断天数是多少 int day = 0; string strYear = cboYear.SelectedItem.ToString().Split(new char[] { '年' }, StringSplitOptions.RemoveEmptyEntries)[0]; string strMonth = cboMonth.SelectedItem.ToString().Split(new char[] { '月' }, StringSplitOptions.RemoveEmptyEntries)[0]; int year = Convert.ToInt32(strYear); int month = Convert.ToInt32(strMonth); switch(month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12:day = 31; break; case 2: if((year%400==0)||(year%4==0&&year%100!=0)) { day = 29; } else { day = 28; } break; default:day = 30; break; } for (int i = 1; i <= day; i++) { cboDay.Items.Add(i + "日"); } } } }