DataGridView控件使用技巧

1、DataGridView右键菜单并选中该行  

       DataGridView中的CurrentRow属性为只读，且其Index也不能动态设置，只能在DataGridView中用左键来选择行，从而实现当前行的定位。

如果要在DataGridView中出现右键菜单并选中该行，可以用下面的代码：

        private void dgvStudent_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)//判读是否是鼠标右键
            {
                dgvStudent.ClearSelection();
                dgvStudent.Rows[e.RowIndex].Selected = true;
                dgvStudent.CurrentCell = dgvStudent.Rows[e.RowIndex].Cells[e.ColumnIndex];
                contextMenuStrip1.Show(MousePosition.X, MousePosition.Y);
            }
        }

2、DataGridView控件在最左边列显示序号

2.1 简单的方法：
绑定数据后，用下面的代码
int rowNumber = 1;
 foreach (DataGridViewRow row in dataGridView1.Rows)
{
        row.HeaderCell.Value = rowNumber.ToString();
        rowNumber++;

}
但序号是2位数的话，显示不清楚，列宽不够。要修改DataGridView控件的RowHeadersWidth属性。
2.2 第2种方法，能让箭头都不显示
       private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            Rectangle rowHeaderBounds = new Rectangle
           (
                2, e.RowBounds.Top,
                this.dataGridView1.RowHeadersWidth - 2, e.RowBounds.Height - 1
           );

            using (Brush backbrush =
                new SolidBrush(SystemColors.Control))
            {
                e.Graphics.FillRectangle(backbrush, rowHeaderBounds);
            }

            if (e.RowIndex >= dataGridView1.FirstDisplayedScrollingRowIndex)
            {
                using (SolidBrush b = new SolidBrush(dataGridView1.RowHeadersDefaultCellStyle.ForeColor))
                {
                    int linen = 0;
                    linen = e.RowIndex + 1;
                    string line = linen.ToString();
                    e.Graphics.DrawString(line, e.InheritedRowStyle.Font, b, e.RowBounds.Location.X, e.RowBounds.Location.Y + 5);
                    SolidBrush B = new SolidBrush(Color.Red);
                }
            }

        }
   }

3、修改DataGridView控件当前行数据后选中改行

 private void dvClass_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
    int index = dvClass.CurrentRow.Index;
    int classId = Convert.ToInt32(dvClass.CurrentRow.Cells[0].Value);
    FormClassEdit edit = new FormClassEdit(classId);
    edit.ShowDialog();
    GetClass();
    dvClass.ClearSelection();
    dvClass.Rows[index].Selected = true;
}