How to get the sum of List object property values using foreach

Question

What i'm trying to do Find the price sum for all items in a shoppingcart list. How i tried to solve it I think it makes sense to add it as a property in the Cart-class. I also think it would be logical to just use a foreach loop to iterate the CartList and add the itemprice (ProductsInCart.Price) to a temporary variable (PriceSum), which is returned in "Cart.PriceAllContent" property. C# ``` //Instantiating Cart Cart C2Cart = new Cart(); //Getting Item in cart from Session C2Cart.TakeCart(); //Writing out result Response.Write(C2Cart.PriceAllContent); ``` Classes ``` public class Cart { //FIELDS private List _cartList; //PROPERTIES public List CartList { get { return _cartList; } set { _cartList = value; } } public float PriceAllContent { get { float PriceSum= 0; foreach (var ProductsInCart in _cartList) { PriceSum= +ProductsInCart.Price; } return PriceSum; } } ........... } public class ProductsInCart { //FIELDS private int _id; private string _name; p…

Accepted Answer

If you want to increment `PriceSum` variable with product price, use += operator:

```
foreach (var ProductsInCart in _cartList)
{
    PriceSum += ProductsInCart.Price; // instead of =+
}
```

When you write `= +value` then its two separate operators = operator and + operator i.e. `+ProductsInCart.Price` just returns value of products, price, and then you assign this value to `PriceSum`. As result, you will have price of last product in list.

You also can use LINQ instead of this loop:

```
public float PriceAllContent
{
    get { return _cartList.Sum(p => p.Price); }
}
```

How to get the sum of List object property values using foreach

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