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private void dataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
{//选中单元格,弹出快捷菜单。
if (e.Button == MouseButtons.Right)
{
if (e.RowIndex >= 0)
{
this.dataGridView1.ClearSelection();
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Selected = true;
this.dataGridView1.CurrentCell = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex]; //右击时选中
contextMenuStrip1.Show(MousePosition.X, MousePosition.Y);
}