C# DataGridView预置RowPostPaint事件如何扩展

[i逐浪]

已知DataGridView控件可以设置RowPostPaint事件，用于显示行标，脚本如下

        private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            DataGridView dgv = sender as DataGridView;
            Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,
                                                e.RowBounds.Location.Y,
                                                dgv.RowHeadersWidth - 4,
                                                e.RowBounds.Height);

            TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(),
                                    dgv.RowHeadersDefaultCellStyle.Font,
                                    rectangle,
                                    dgv.RowHeadersDefaultCellStyle.ForeColor,
                                    TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
        }

现在想把它添加到扩展的用户类里面，

namespace JunlinDatabaseQuery
{
    public partial class LJLdataGridView : System.Windows.Forms.DataGridView
    {
        public LJLdataGridView()
        {
        }

        public void LJLdataGridView_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            DataGridView dgv = sender as DataGridView;
            Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,
                                                e.RowBounds.Location.Y,
                                                dgv.RowHeadersWidth - 4,
                                                e.RowBounds.Height);

            TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(),
                                    dgv.RowHeadersDefaultCellStyle.Font,
                                    rectangle,
                                    dgv.RowHeadersDefaultCellStyle.ForeColor,
                                    TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
        }
    }
}

新窗体调用LJLdataGridView控件时，RowPostPaint事件没有自动生效，是哪一方面问题？

高手们能否帮忙分析指导一下？谢谢！

[i逐浪]

@xuzuning 能指导一下完整的脚本是怎么写的吗？我是新手，试了多次，没能搞定。

[xuzuning]

重载

protected override void OnRowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)

{....}

或显式指派

RowPostPaint+= .......