列表框----C#窗体

 

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;



namespace trytry

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void radioButton6_CheckedChanged(object sender, EventArgs e)

        {

            if (radioButton6.Checked == true) listBox1.MultiColumn = true;

        }



        private void radioButton5_CheckedChanged(object sender, EventArgs e)

        {

            if(radioButton5.Checked == true)  listBox1.MultiColumn=false;

        }



        private void radioButton3_CheckedChanged(object sender, EventArgs e)

        {

            if (radioButton3.Checked == true)

                listBox1.SelectionMode = SelectionMode.MultiSimple;

        }



        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)

        {

            label1.Text=""; //如果是单选，则使用SelectedItem返回所选项

    if(listBox1.SelectedIndices.Count==1)

           label1.Text=listBox1.SelectedItem.ToString();

    else{  //如果是多选，则使用SelectedItems返回所有的所选项

       for(int i=0;i<listBox1.SelectedIndices.Count;i++)

           label1.Text+=listBox1.SelectedItems[i].ToString() + " ";}



        }



        private void radioButton2_CheckedChanged(object sender, EventArgs e)

        {

            if (radioButton2.Checked == true)

                listBox1.SelectionMode = SelectionMode.One;

        }



        private void radioButton4_CheckedChanged(object sender, EventArgs e)

        {

            if (radioButton4.Checked == true)

                listBox1.SelectionMode = SelectionMode.MultiExtended;

        }



        private void radioButton1_CheckedChanged(object sender, EventArgs e)

        {

            if (radioButton1.Checked == true)

                listBox1.SelectionMode = SelectionMode.None;

        }

    }

}