问题：在datagridview中乘以2列

Question

如何将产品的数量乘以价格，从而在数据网格视图中给出总和值。支付值的数量应为40，而不是屏幕截图中所示的20，因为第一项的数量为2。

private void dgv_order_CellClick(object sender, DataGridViewCellEventArgs e)
{
    int ind = e.RowIndex;
    DataGridViewRow selectedRows = dgv_order.Rows[ind];
    txt_order.Text = selectedRows.Cells[0].Value.ToString();
    cls.select_order1(dataGridView2, txt_order.Text);
    int sum = 0;
    for (int i = 0; i < dataGridView2.Rows.Count; ++i)
    {
        sum += Convert.ToInt32(dataGridView2.Rows[i].Cells[3].Value);
    }
    lblamount.Text = sum.ToString();
} 

这是我用于在左侧数据网格视图中选择订单ID的代码，并且我还将其用于金额的总和。

谢谢

Answer 1

 private void dgv_order_CellClick(object sender, DataGridViewCellEventArgs e)
{
    int ind = e.RowIndex;
    DataGridViewRow selectedRows = dgv_order.Rows[ind];
    txt_order.Text = selectedRows.Cells[0].Value.ToString();
    cls.select_order1(dataGridView2, txt_order.Text);
    int sum = 0;
    for (int i = 0; i < dataGridView2.Rows.Count; ++i)
    {
        sum += (Convert.ToInt32(dataGridView2.Rows[i].Cells[3].Value) * Convert.ToInt32(dataGridView2.Rows[i].Cells[2].Value));
    }
    lblamount.Text = sum.ToString();
}