C# C/S下DataGrid根据数据库里的值(int型)显示ImageList里的图片

由于做项目需要写了一个显示图片的自定的DataGridColumn样式，抛砖引玉了

using System;
using System.Data;
using System.Windows.Forms;
using System.Drawing;

namespace DataGridPictureBoxColumn
{

public class DataGridPictureBoxColumn : DataGridColumnStyle
{
private ImageList _showimagelist = null;

public ImageList ShowImageList
{
set
{
_showimagelist = value;
}
}

public DataGridPictureBoxColumn() : base()
{
}

protected override void Paint(Graphics g,
Rectangle bounds,
CurrencyManager source,
int rowNum)
{
Paint(g, bounds, source, rowNum, false);
}
protected override void Paint(
Graphics g,
Rectangle bounds,
CurrencyManager source,
int rowNum,
bool alignToRight)
{
Paint(
g,bounds,
source,
rowNum,
Brushes.Red,
Brushes.Blue,
alignToRight);
}
protected override void Paint(
Graphics g,
Rectangle bounds,
CurrencyManager source,
int rowNum,
Brush backBrush,
Brush foreBrush,
bool alignToRight)
{
int Index = (int)GetColumnValueAtRow(source, rowNum);
g.FillRectangle(new SolidBrush(Color.White),bounds);
g.DrawImage(this._showimagelist.Images[Index],bounds);
}

protected override void Abort(int rowNum)
{
Invalidate();
}

protected override bool Commit
(CurrencyManager dataSource, int rowNum)
{
Invalidate();

return true;
}

protected override void Edit(
CurrencyManager source,
int rowNum,
Rectangle bounds,
bool readOnly,
string instantText,
bool cellIsVisible)
{
return;
}

protected override Size GetPreferredSize(
Graphics g,
object value)
{
return new Size(20,20);
}

protected override int GetMinimumHeight()
{
return 20;
}

protected override int GetPreferredHeight(Graphics g,
object value)
{
return 20;
}

}
}