// 允许增加一个 checkbox 列 
public class DgvBase : DataGridViewX
    {
        protected override void OnColumnAdded(DataGridViewColumnEventArgs e)
        {
            base.OnColumnAdded(e);
            //if (e.Column.ValueType == typeof(int) || e.Column.ValueType == typeof(long) || e.Column.ValueType == typeof(float) 
            //    || e.Column.ValueType == typeof(double) || e.Column.ValueType == typeof(decimal))
            if (e.Column.ValueType == typeof(decimal)) e.Column.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
        }

        protected override void OnRowPostPaint(DataGridViewRowPostPaintEventArgs e)
        {
            base.OnRowPostPaint(e);     //this.Rows[e.RowIndex].Selected ? this.RowHeadersDefaultCellStyle.SelectionForeColor : 
            TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), this.RowHeadersDefaultCellStyle.Font, new Rectangle(e.RowBounds.Location.X, e.RowBounds.Location.Y, this.RowHeadersWidth - 4, e.RowBounds.Height), this.RowHeadersDefaultCellStyle.ForeColor, TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
        }

        protected override void OnCellClick(DataGridViewCellEventArgs e)
        {
            base.OnCellClick(e);
            // 设置此列在点击时可改变值
            DataGridViewColumn dc = this.Columns [e.ColumnIndex ];
            if (dc.ReadOnly && dc.Name == "IsSelected")
                this[e.ColumnIndex, e.RowIndex].Value = !Generic.ToBoolean(this[e.ColumnIndex, e.RowIndex].Value);
        }
    }

    public static class DgvExtensions
    {
        public static void DataBind(this DgvBase dgv, DataTable dt)
        {
            if (dt != null && !dt.Columns.Contains("IsSelected"))
            {
                DataColumn dc = dt.Columns.Add("IsSelected", typeof(bool));
                dc.SetOrdinal(0);
            }
            dgv.DataSource = dt;
        }
    }