DataGridView中实现右击选中当前行功能,并通过ContextMenuStrip获取当前行

private void gvShow_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
gvShow.ClearSelection();
gvShow.Rows[e.RowIndex].Cells[e.ColumnIndex].Selected = true;
gvShow.CurrentCell = gvShow.Rows[e.RowIndex].Cells[e.ColumnIndex];
}
}

private void TestToolStripMenuItem_Click(object sender, EventArgs e)
{
string str = gvShow.CurrentCell.RowIndex.ToString();
MessageBox.Show(str);
}