在 DataGridView c# 中添加具有相同 ID 的值

Question

I want to add the value with of the displayed data in my datagridview because i cant do it in the with query because it is encrypted.

sample displayed:

product	sold
coke	20
coke	20

And here is what i want to happen:

product	sold
coke	40

Answer 1

You can create a new grouped list after you have the initial one in code behind. You can try something like this:

        List<KeyValuePair<string, int>> productOrders = new List<KeyValuePair<string, int>>();

        // Fill list of productOrders
        productOrders.Add(new KeyValuePair<string, int>("coke", 20));
        productOrders.Add(new KeyValuePair<string, int>("coke", 20));
        productOrders.Add(new KeyValuePair<string, int>("cokeX", 20));
        productOrders.Add(new KeyValuePair<string, int>("cokeX", 20));
        productOrders.Add(new KeyValuePair<string, int>("cake", 20));
        productOrders.Add(new KeyValuePair<string, int>("cokeX", 20));


        List<KeyValuePair<string, int>> ordersByProduct = new List<KeyValuePair<string, int>>();

        foreach(var order in productOrders)
        {
            if(ordersByProduct.Where(x => x.Key == order.Key).ToList() != null && ordersByProduct.Where(x => x.Key == order.Key).ToList().Count > 0)
            {
                KeyValuePair<string, int> currentValueByProduct = ordersByProduct.Where(x => x.Key == order.Key).First();
                int combinedPrice = order.Value + currentValueByProduct.Value;
                ordersByProduct.Add(new KeyValuePair<string, int>(order.Key, combinedPrice));
                ordersByProduct.Remove(currentValueByProduct);
            }
            else
            {
                ordersByProduct.Add(new KeyValuePair<string, int>(order.Key, order.Value));
            }
        }

        // Set DataGridView to ordersBuProduct
        //return ordersByProduct;

In your case productOrders would be the decrypted data (you might have a class for the productOrders you don't have to use KeyValuePair). In the end set the datasource of the DataGridView to the ordersByProduct list.