在数据网格视图中显示数据？访问，C#

Question

我想计算总价并将其显示在数据网格视图中。第四列没有从数据库中检索信息，所以我不知道该怎么做。下面是 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进行 subTotal 计算，然后将 subTotal 变量添加到您对 dataGrid.Rows.Add() 的调用中。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，您可以使用 DataGridView 控件的 DataSource 属性让您的生活更轻松，但是要根据您当前的设置解决您的问题，我只需移动一些代码并像这样进行操作：

double subTotal = itemQuant * priceEach;

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