C# Winfom 中ListBox的简单用法详解

this.listBox1.Items.Add("张晓东");

//检查添加值是否添加过if(this.listBox1.items.Contains("张晓东")){  MessageBox.show("集合成员已添加过！");  }else{   //执行添加集合成员}

//判断所有选中项集合大于0if(this.listBox1.SelectedItems.Count > 0){   //获取选中的值   this.listBox1.SelectedItem.ToString(); }else{  MessageBox.Show("未选中listbox集合的值"); }

//移除listBox集合的项this.listBox1.Items.Remove("张晓东");

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 WindowsForms{  public partial class Form3 : Form  {    public Form3()    {      InitializeComponent();    }    /// <summary>    /// 添加人员到采购部门    /// </summary>    /// <param name="sender"></param>    /// <param name="e"></param>    private void btnInsert_Click(object sender, EventArgs e)    {      //获取添加人的值      string peopleText = this.txtPeople.Text.Trim().ToString();      //获取listbox1的对象      ListBox list1 = this.listBox1;      //判断人员是否已经添加过      if (!list1.Items.Contains(peopleText))      {        list1.Items.Add(peopleText);      }      else {        MessageBox.Show("该人员已经添加过，无法重复添加！");      }    }    /// <summary>    /// 将采购人员转移到销售部门    /// </summary>    /// <param name="sender"></param>    /// <param name="e"></param>    private void btnRightMove_Click(object sender, EventArgs e)    {      //获取listbox1的所有选中的项      if (this.listBox1.SelectedItems.Count > 0)      {        string checkPeople = this.listBox1.SelectedItem.ToString();        //判断是否添加到listbox2        if (!this.listBox2.Items.Contains(checkPeople)) {          //添加人员到listbox2中          this.listBox2.Items.Add(checkPeople);          //移除listbox1中          this.listBox1.Items.Remove(checkPeople);        }        else        {          MessageBox.Show("该人员已经转移过，无法重复转移！");        }      }      else {        MessageBox.Show("未选中采购人员，无法转移销售部门！");      }    }    /// <summary>    /// 将销售人员转移到采购部门    /// </summary>    /// <param name="sender"></param>    /// <param name="e"></param>    private void btnLeftMove_Click(object sender, EventArgs e)    {      //获取listbox2的所有选中的项      if (this.listBox2.SelectedItems.Count > 0)      {        string checkPeople = this.listBox2.SelectedItem.ToString();        //判断是否添加到listbox1        if (!this.listBox1.Items.Contains(checkPeople))        {          //添加人员到listbox1中          this.listBox1.Items.Add(checkPeople);          //移除listbox1中          this.listBox2.Items.Remove(checkPeople);        }        else        {          MessageBox.Show("该人员已经转移过，无法重复转移！");        }      }      else      {        MessageBox.Show("未选中销售人员，无法转移到采购部门！");      }    }  }}