在数据网格视图中显示数据？访问，C＃

Question

我想计算总价并在数据网格视图中显示它。第四列不从数据库中检索信息，因此我不知道如何执行此操作。这是GUI的样子：

这是我到目前为止的代码......

                double colTotal = 0; //set column total to 0

                foreach (DataRow currentRow in itemDS.Tables[0].Rows)
                {
                    // add to data grid view
                    invoiceDataGridView.Rows.Add(currentRow[1].ToString(), currentRow[2].ToString(), currentRow[3].ToString());

                    //Decalare variables for item quantity and price
                    var itemQuant = Convert.ToDouble(currentRow[1]);
                    var priceEach = Convert.ToDouble(currentRow[3]);

                    //Multiply the item quantity by the item price
                    double subTotal = itemQuant * priceEach;

                    //do this for each row
                    colTotal += subTotal;
                }

                //Display subtotal
                subTotalOutput.Text = colTotal.ToString();
                //Calculate tax
                double tax = colTotal * .073;
                //Display total tax
                taxOutput.Text = Convert.ToString(tax);
                //Add the subtotal and the total tax
                double totPrice = colTotal + tax;
                //Display total price
                totalOutput.Text = Convert.ToString(totPrice);

            }

Answer 1

我相信您可以在填充网格之前执行subTotal计算，并在末尾添加subTotal变量以调用dataGrid.Rows.Add()。像这样：

foreach (DataRow currentRow in itemDS.Tables[0].Rows)
{
    //Decalare variables for item quantity and price
    var itemQuant = Convert.ToDouble(currentRow[1]);
    var priceEach = Convert.ToDouble(currentRow[3]);

    //Multiply the item quantity by the item price
    double subTotal = itemQuant * priceEach;


    // add to data grid view
    invoiceDataGridView.Rows.Add(currentRow[1].ToString(), currentRow[2].ToString(), currentRow[3].ToString(), subTotal);

    //do this for each row
    colTotal += subTotal;
}

Answer 2

我首先要说的是，使用DataGridView控件的DataSource属性可以让您的生活更轻松，但是为了解决您当前设置的问题，我只需移动一些代码并按照以下方式执行：

double subTotal = itemQuant * priceEach;

invoiceDataGridView.Rows.Add(currentRow[1].ToString(), currentRow[2].ToString(), currentRow[3].ToString(), subTotal.ToString());