Question

我创建了一种方法，该方法可以检测何时输入具有相同条形码的产品，而不是将其输入为新行，而只会增加其数量。问题是我有第四行显示总价格，但没有显示。

代码：

private void AddProduct()
    {
        bool Found = false;

        if (dataGridView1.Rows.Count > 0)
        {

            foreach (DataGridViewRow row in dataGridView1.Rows)


                if (Convert.ToString(row.Cells[0].Value) == txtBarcode.Text)
                {
                    row.Cells[3].Value =Convert.ToString(1 + Convert.ToInt64(row.Cells[3].Value));
                    Found = true;
                    //break;
                }

        }
        if (!Found)

        {

            price = float.Parse(txtPrice.Text);
            Quantity = float.Parse(Quantity.Text);
            FinalPrice = price * Quantity;

            var firstRow = txtBarcode.Text;
            var secRow = txtName.Text;
            var thirdRow = price;
            var fourthrow = quantity;
            var fifthrow = FinalPrice;


            dataGridView1.Rows.Add(firstRow, secRow, thirdRow , fourthrow, fifthrow );
        }
    }

Answer 1

我只是在这里猜测，因为您的代码不是最干净的，但是您似乎仅在更新网格中的数量。试试这个（也比较干净）

var existingRow = dataGridView1.Rows
    .Where(r => Convert.ToString(r.Cells[0].Value) == txtBarcode.Text)
    .SingleOrDefault();

if(existingRow != null)
{
    var price = Convert.ToInt64(existingRow.Cells[2].Value);
    var quantity = Convert.ToInt64(existingRow.Cells[3].Value);

    existingRow.Cells[3].Value = quantity + 1;
    existingRow.Cells[4].Value = price * (quantity + 1);
}
else
{
    // Your !found logic
}

Answer 2

找到条形码后，您不会调用计算方法。喜欢。

                   if (Convert.ToString(row.Cells[0].Value) == 
                     txtBarcode.Text)
                         {
                          row.Cells[3].Value =Convert.ToString(1 + 
                           Convert.ToInt64(row.Cells[3].Value;

               price = float.Parse(txtPrice.Text);
               Quantity = float.Parse(Quantity.Text);
               FinalPrice = price * Quantity;

                       Found = true;
                //break;
                      }

C＃-在datagridview上计算总价

2 个答案: