listbox隔行显示不同颜色

要实现这个效果很简单，只需自定义一个类继承ListBox，然后重写OnDrawItem事件就可以了，下面看代码

class CListbox:ListBox

{

[System.Runtime.InteropServices.DllImport("user32.dll")]

static extern IntPtr GetWindowDC(IntPtr hWnd);

[System.Runtime.InteropServices.DllImport("user32.dll")]

static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

protected override void OnDrawItem(DrawItemEventArgs e)

{

Graphics g = e.Graphics;

if (e.Index % 2 == 0)

{

g.FillRectangle(new SolidBrush(Color.WhiteSmoke), e.Bounds);

g.DrawString(Items[e.Index].ToString(), e.Font, new SolidBrush(Color.Blue), e.Bounds);

}

else

{

g.FillRectangle(new SolidBrush(Color.WhiteSmoke), e.Bounds);

g.DrawString(Items[e.Index].ToString(), e.Font, new SolidBrush(Color.Red), e.Bounds);

}

e.DrawFocusRectangle();

g.Dispose();

base.OnDrawItem(e);

}

//捕获消息，画listbox边框

protected override void WndProc(ref Message m)

{

if (m.Msg == 0xf || m.Msg == 0x133)

{

IntPtr hDC = GetWindowDC(m.HWnd);

System.Drawing.Pen pen = new Pen(Color.YellowGreen, 1);

System.Drawing.Graphics g = Graphics.FromHdc(hDC);

g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

g.DrawRectangle(pen, 0, 0, this.Width - 1, this.Height - 1);

pen.Dispose();

g.Dispose();

ReleaseDC(m.HWnd, hDC);

}

base.WndProc(ref m);

}

}

应用如下：

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private CListbox mylistbox;

private void Form1_Load(object sender, EventArgs e)

{

mylistbox = new CListbox();

mylistbox.ItemHeight = 32;

mylistbox.DrawMode = DrawMode.OwnerDrawVariable;

mylistbox.Height = 150;

mylistbox.Width = 250;

mylistbox.Items.Add("第一行显示！");

mylistbox.Items.Add("第二行显示！");

mylistbox.Items.Add("第三行显示！");

mylistbox.Items.Add("第四行显示！");

mylistbox.Items.Add("第五行显示！");

mylistbox.Items.Add("第六行显示！");

mylistbox.Items.Add("第七行显示！");

mylistbox.Items.Add("第八行显示！");

mylistbox.Items.Add("第九行显示！");

mylistbox.Items.Add("第十行显示！");

mylistbox.Items.Add("第十一行显示！");

mylistbox.Items.Add("第十二行显示！");

this.Controls.Add(mylistbox);

}

}

效果如下：