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C#(二十九)之C#listBox checkedlistbox imagelist
2022-07-06 03:39:00 【camellias_】
listBox属性:
Items:所有选项
SelectionMode:是否支持多选
(1):one 只能选择一个
(2):Multisimple 可选择多个
(3):MultExtended 按组合键可多选
(4):none 不可选择
Multicolnum:
true:支持水平排列
false:不支持水平排列
SelectedIndex
listbox选项的索引是从0开始排列的。
Checklistbox
Items:所有选项
CheckOnClick
False:需要双击才能选中选项
True:单击便可选中选项
Imagelist 组件
Images:
组件中图片集合 使用数组表示
测试使用全部代码
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 _0416Day
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void putButton_Click(object sender, EventArgs e)
{
int index = listBox1.SelectedIndex;
if(index == 0)
{
result.Text = listBox1.SelectedItem.ToString();
}
else if(index == 1)
{
result.Text = listBox1.SelectedItem.ToString();
}
else if (index == 2)
{
result.Text = listBox1.SelectedItem.ToString();
}
else
{
MessageBox.Show("请选择选项");
}
}
/**
* 添加按钮
*/
private void Add_Click(object sender, EventArgs e)
{
listBox1.Items.Add(Input.Text);
Input.Clear();
}
/**
* 移除按钮
*/
private void Remove_Click(object sender, EventArgs e)
{
int sel = listBox1.SelectedIndex;
if (sel != -1)
{
listBox1.Items.RemoveAt(listBox1.SelectedIndex);
}
else
{
MessageBox.Show("请选择需要移除的选项");
}
}
/**
* 清空按钮
*/
private void Clear_Click(object sender, EventArgs e)
{
listBox1.Items.Clear();
}
/**
* 复选框默认事件
* 选中文字打勾才会执行(在不修改CheckOnClick属性时需要双击才会打勾)
*/
private void fubox_SelectedIndexChanged(object sender, EventArgs e)
{
}
/**
* 复选框默认事件
* 选中文字(不打勾)就会执行
*/
private void fubox_ItemCheck(object sender, ItemCheckEventArgs e)
{
// e是参数对象,等于被选中的那个值
if (e.NewValue == CheckState.Checked)
{
// 选中的主键(选中之后显示图片)
switch (e.Index)
{
case 0: pictureBox1.Image = imageList1.Images[0]; break;
case 1: pictureBox2.Image = imageList1.Images[1]; break;
case 2: pictureBox3.Image = imageList1.Images[2]; break;
case 3: pictureBox4.Image = imageList1.Images[3]; break;
}
}
else
{
// 未选中的主键(去掉选中之后图片消失)
switch (e.Index)
{
case 0: pictureBox1.Image = null; break;
case 1: pictureBox2.Image = null; break;
case 2: pictureBox3.Image = null; break;
case 3: pictureBox4.Image = null; break;
}
}
}
}
}
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