C# 乘以 2 数据网格从输入中查看列并将结果放在第三列中

Question

I'm working on a POS winforms application, and I'm having trouble, the datagridview is filled by user input, through a barcode scanner, and then the user adjusts the Quantity inside the data grid view, what I want to do is when the user changes the value of Quantity ( which is set to 1 by default) it gets multiplied by second column which is price and show the result in the third column

Column A (value entered) x Column B = Result to Column C

I've tried using this code, but no luck

            private void dataGridView1_CellValidated(object sender, DataGridViewCellEventArgs e)
            {


                for (int i = 0; i < dataGridView1.Rows.Count; i++)
                {
            int a =dataGridView1.Rows[i][0].value;
            int b =dataGridView1.Rows[i][1].value;

            int c = a*b;

            c=dataGridView1.Rows[i][2].value;


      }

it gave me Error 14 Cannot apply indexing with [] to an expression of type 'System.Windows.Forms.DataGridViewRow'

Answer 1

You need to use the Cells property of the DataGridViewRow class

Use:

int a = dataGridView1.Rows[i].Cells[0].Value;
int b = dataGridView1.Rows[i].Cells[1].Value;

int c = a * b;

dataGridView1.Rows[i].Cells[2].Value = c;

Please note, I change the last line to be dataGridView1.Rows[i].Cells[2].Value = c; as that seems to match your question...you want the answer stored in the cell.

Answer 2

            decimal s = Convert.ToDecimal(dataGridView_DaginaAdd_SellInovice.CurrentRow.Cells[10].Value);
            decimal s1 = Convert.ToDecimal(dataGridView_DaginaAdd_SellInovice.CurrentRow.Cells[11].Value);
            decimal s13 = s + s1; Convert.ToDecimal(dataGridView_DaginaAdd_SellInovice.CurrentRow.Cells[12].Value = s13);