自定义DataGridView Cell和Column

class ImageTextCellValue
{
    private string text;

    public string Text
    {
        get { return text; }
        set { text = value; }
    }

    private Image img;

    public Image Image
    {
        get { return img; }
        set { img = value; }
    }
}

class DataGridViewImageTextBoxCell : DataGridViewImageCell
{
    public DataGridViewImageTextBoxCell()
    {
    }

    public override object Clone()
    {
        DataGridViewImageTextBoxCell cell = (DataGridViewImageTextBoxCell)base.Clone();
        return cell;
    }

    protected override object GetFormattedValue(object value, int rowIndex, ref DataGridViewCellStyle cellStyle, System.ComponentModel.TypeConverter valueTypeConverter, System.ComponentModel.TypeConverter formattedValueTypeConverter, DataGridViewDataErrorContexts context)
    {
        if (value is Image)
            return (value as Image).ToString();
        else
            return (value as ImageTextCellValue).Text;

        //return base.GetFormattedValue(value, rowIndex, ref cellStyle, valueTypeConverter, formattedValueTypeConverter, context);
    }

    protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates elementState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
    {
        // Draw the cell background, if specified.
        if ((paintParts & DataGridViewPaintParts.Background) == DataGridViewPaintParts.Background)
        {
            SolidBrush cellBackground = new SolidBrush(cellStyle.BackColor);

            if (this.Selected)
                cellBackground = new SolidBrush(cellStyle.SelectionBackColor);

            graphics.FillRectangle(cellBackground, cellBounds);
            cellBackground.Dispose();
        }

        // Draw the cell borders, if specified.
        if ((paintParts & DataGridViewPaintParts.Border) == DataGridViewPaintParts.Border)
        {
            PaintBorder(graphics, clipBounds, cellBounds, cellStyle, advancedBorderStyle);
        }

        Image img = null;
        string text = "";

        if (value is Image)
        {
            img = (Image)value;
        }
        else if (value is ImageTextCellValue)
        {
            img = (value as ImageTextCellValue).Image;
            text = (value as ImageTextCellValue).Text;
        }

        if (img != null)
        {
            Rectangle imageRect = new Rectangle(cellBounds.X + 4, cellBounds.Y, 16, 16);
            graphics.DrawImage(img, imageRect);
        }

        StringFormat sf = new StringFormat();
        sf.Alignment = StringAlignment.Center;
        sf.LineAlignment = StringAlignment.Center;
        int txtWidth = (int)graphics.MeasureString(text, cellStyle.Font).Width + 2;
        SolidBrush textBrush = new SolidBrush(cellStyle.ForeColor);
        if (this.Selected)
            textBrush = new SolidBrush(cellStyle.SelectionForeColor);

        graphics.DrawString(text, cellStyle.Font, textBrush, new Rectangle(cellBounds.X + 20, cellBounds.Y, txtWidth, cellBounds.Height), sf);

        //base.Paint(graphics, clipBounds, cellBounds, rowIndex, elementState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);
    }

}

class DataGridViewImageTextBoxColumn : DataGridViewImageColumn
{
    public DataGridViewImageTextBoxColumn()
    {
        this.CellTemplate = new DataGridViewImageTextBoxCell();
    }

    public override DataGridViewCell CellTemplate
    {
        get
        {
            return base.CellTemplate;
        }
        set
        {
            if (value != null && !value.GetType().IsAssignableFrom(typeof(DataGridViewImageTextBoxCell)))
            {
                throw new Exception("这个列里面必须邦定DataGridViewImageTextBoxCell");
            }

            base.CellTemplate = value;
        }
    }

}