C# WinForm控件ListBox点选可编辑(附源码)

源码下载：http://dotnet.5d6d.com/thread-471-1-1.html
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：

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);

}

经过这样的控制后，设计界面中的ListBox项看不到了，但没关系，运行的时候是可见的，而且每个项的高度确实作了有效更改。
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;

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();

        }

    }

}

经过这样的处理后，我们看看最终的效果：

源码下载：http://dotnet.5d6d.com/thread-471-1-1.html