DataGridView之编码列重绘

实现方式如下：

private void dgvRelation_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            try
            {
                SolidBrush b = new SolidBrush(this.dgvRelation.RowHeadersDefaultCellStyle.ForeColor);
                e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture),
                    this.dgvRelation.DefaultCellStyle.Font, b, e.RowBounds.Location.X + 20, e.RowBounds.Location.Y + 4);
            }
            catch { return; }
        }

效果如下：

注意：使用该方式处理编号列的显示，需要处理cell_click事件，如： if (e.RowIndex == -1||e.ColumnIndex==-1) return;

 升个级

        /// <summary>
        /// 重绘DataGridView
        /// </summary>
        /// <param name="dgv"></param>
        /// <param name="e"></param>
        public void PaintDgv(DataGridView dgv, DataGridViewRowPostPaintEventArgs e)
        {
            try
            {
                SolidBrush b = new SolidBrush(dgv.RowHeadersDefaultCellStyle.ForeColor);
                e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture),
                    dgv.DefaultCellStyle.Font, b, e.RowBounds.Location.X + 5, e.RowBounds.Location.Y + 4);

                // 改变第一列列头内容
                dgv.TopLeftHeaderCell.Value = dgv.RowCount.ToString();
                dgv.TopLeftHeaderCell.ToolTipText = "查询数据总量为：" + dgv.RowCount.ToString() + "(条)";
            }
            catch { return; }
        }    

 方式二：通过处理RowStateChanged事件实现

 public void SetDgvNumCloByRowStateChanged(DataGridView dgv, DataGridViewRowStateChangedEventArgs e)
        {
            int rowCounts = dgv.Rows.Count;
            if (rowCounts > 0)
            {
                for (int i = 0; i < rowCounts; i++)
                {
                    dgv.Rows[i].HeaderCell.Value = (i + 1).ToString();
                }

                // 改变第一列列头内容
                dgv.TopLeftHeaderCell.Value = dgv.RowCount.ToString();
                dgv.TopLeftHeaderCell.ToolTipText = "查询数据总量为：" + dgv.RowCount.ToString() + "(条)";
            }
        }

 设置首列列头字体颜色

 /// <summary>
        /// 重绘DataGridView
        /// </summary>
        /// <param name="dgv"></param>
        /// <param name="e"></param>
        public void PaintDgv(DataGridView dgv, DataGridViewRowPostPaintEventArgs e)
        {
            try
            {
                SolidBrush b = new SolidBrush(dgv.RowHeadersDefaultCellStyle.ForeColor);
                e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture),
                    dgv.DefaultCellStyle.Font, b, e.RowBounds.Location.X + 5, e.RowBounds.Location.Y + 4);

                // 改变第一列列头内容
                dgv.EnableHeadersVisualStyles = false;//允许更改行、列头的字体颜色
                dgv.TopLeftHeaderCell.Value = dgv.RowCount.ToString();
                dgv.TopLeftHeaderCell.Style.ForeColor = Color.Salmon;
                dgv.TopLeftHeaderCell.Style.Font = new Font("微软雅黑", 10, FontStyle.Bold);
                dgv.TopLeftHeaderCell.ToolTipText = "查询数据总量为：" + dgv.RowCount.ToString() + "(条)";
            }
            catch { return; }
        }