ListBox实现更改选中项目的顺序

窗体很简单 我主要是要做一下功能;简单的实现了下,没有做比较严谨的规划和按钮限制考虑, 有兴趣的朋友可以改进功能,大体上就下面的这样的个窗体

代码如下:

 

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 WindowsFormsApplication1
...{
    public partial class Form1 : Form
    ...{
        public Form1()
        ...{
            InitializeComponent();
        }
        private void btntop_Click(object sender, EventArgs e)
        ...{
            for (int i = this.listBox1.SelectedIndex; i >0 ; i--)
            ...{
                string aa = listBox1.SelectedItem.ToString();
                string uptest = this.listBox1.Items[i - 1].ToString();
                //把当前选择行的值与上一行互换 并将选择索引减1
                listBox1.Items[i - 1] = aa;
                listBox1.Items[i] = uptest;
                listBox1.SelectedIndex = i - 1;
            }
        }

        private void btnUP_Click(object sender, EventArgs e)
        ...{
            int i = this.listBox1.SelectedIndex;
            if (i > 0)
            ...{
                string aa = listBox1.SelectedItem.ToString();
                string uptest = this.listBox1.Items[i - 1].ToString();
                //把当前选择行的值与上一行互换 并将选择索引减1
                listBox1.Items[i - 1] = aa;      
                listBox1.Items[i] = uptest; 
                listBox1.SelectedIndex = i - 1;
            }
            else
            ...{
                //button2.Enabled = false;
            }

        }

        private void btnDown_Click(object sender, EventArgs e)
        ...{
             int i = this.listBox1.SelectedIndex;
             if (i < listBox1.Items.Count-1)
             ...{
                 string aa = listBox1.SelectedItem.ToString();
                 string uptest = this.listBox1.Items[i + 1].ToString();
                 //把当前选择行的值与下一行互换 并将选择索引加1
                 listBox1.Items[i + 1] = aa;     
                 listBox1.Items[i] = uptest;
                 listBox1.SelectedIndex = i + 1;
             }
        }

        private void btnBottom_Click(object sender, EventArgs e)
        ...{
            
            int j = this.listBox1.Items.Count - 1;
            for (int i = this.listBox1.SelectedIndex; i < j;i++ )
            ...{
                string aa = listBox1.SelectedItem.ToString();
                string uptest = this.listBox1.Items[i + 1].ToString();
                //把当前选择行的值与下一行互换 并将选择索引加1
                listBox1.Items[i + 1] = aa;
                listBox1.Items[i] = uptest;
                listBox1.SelectedIndex = i + 1;
            }
        }
    }
}