正常情况下，.Net自带的ListBox是无法进行编辑的，欲让它可编辑，我们可添加一个隐藏的文本编辑框，当双击项的时候显示编辑框，更新项内容后隐藏编辑框即可。
欲调整ListBox每个项的高度，ListBox有一个自带属性ItemHeight，于是我们很自然的就设这个属性值，结果却发现改不动，改后又返回默认值12，后面才发现要使该属性值有效更改，必须将DrawMode属性设为OwnerDrawFixed，并且为ListBox添加DrawItem事件：
{
e.DrawBackground();
e.DrawFocusRectangle();
e.Graphics.DrawString(listBox1.Items[e.Index].ToString(), e.Font, new SolidBrush(e.ForeColor), e.Bounds);
}
接下来我们为ListBox再添几个事件来控制编辑框的显示，其实就两个：DoubleClick和MouseClick。好了，在添加之前我们在全局区定义一个编辑框txtEdit，并在构造函数为其添加KeyDown事件：
全部代码如下：
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace EditListBox
{
public partial class Form1 : Form
{
TextBox txtEdit = new TextBox();
/// <summary>
/// KeyDown事件定义
/// </summary>
private void txtEdit_KeyDown(object sender, KeyEventArgs e)
{
//Enter键 更新项并隐藏编辑框
if (e.KeyCode == Keys.Enter)
{
listBox1.Items[listBox1.SelectedIndex] = txtEdit.Text;
txtEdit.Visible = false;
}
//Esc键 直接隐藏编辑框
if (e.KeyCode == Keys.Escape)
txtEdit.Visible = false;
}
public Form1()
{
InitializeComponent();
txtEdit.KeyDown += new KeyEventHandler(txtEdit_KeyDown);
SetListBox();
BindListBox();
}
//设置ListBox，高度为20
private void SetListBox()
{
listBox1.DrawMode = DrawMode.OwnerDrawFixed;
listBox1.ItemHeight = 20;
}
//绑定ListBox
private void BindListBox()
{
ListItem li = new ListItem(“0”, “选项一”);
listBox1.Items.Add(li);
li = new ListItem(“1”, “选项二”);
listBox1.Items.Add(li);
li = new ListItem(“2”, “选项三”);
listBox1.Items.Add(li);
}
/// <summary>
/// 选择项类，用于ComboBox或者ListBox添加项
/// </summary>
public class ListItem
{
private string id = string.Empty;
private string name = string.Empty;
public ListItem(string sid, string sname)
{
id = sid;
name = sname;
}
public override string ToString()
{
return this.name;
}
public string ID
{
get
{
return this.id;
}
set
{
this.id = value;
}
}
public string Name
{
get
{
return this.name;
}
set
{
this.name = value;
}
}
}
private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
{
e.DrawBackground();
e.DrawFocusRectangle();
e.Graphics.DrawString(listBox1.Items[e.Index].ToString(), e.Font, new SolidBrush(e.ForeColor), e.Bounds);
}
private void listBox1_MouseClick(object sender, MouseEventArgs e)
{
txtEdit.Visible = false;
}
private void listBox1_DoubleClick(object sender, EventArgs e)
{
int itemSelected = listBox1.SelectedIndex;
string itemText = listBox1.Items[itemSelected].ToString();
Rectangle rect = listBox1.GetItemRectangle(itemSelected);
txtEdit.Parent = listBox1;
txtEdit.Bounds = rect;
txtEdit.Multiline = true;
txtEdit.Visible = true;
txtEdit.Text = itemText;
txtEdit.Focus();
txtEdit.SelectAll();
}
}
}
