get value in ObserableColection<> and process it?-CodePudding

Im new Linq in c# . I have a problem that needs to be solved. I add the values to the ObserableColection. where there is count and price and i want to take those 2 values and add it and write it in the function. Can anyone help me please.

my code :

public CookViewModel()
{
    cookviewmodel = new ObservableCollection<CookModel>();
    cookviewmodel.Add(new CookModel { Menu = "Bắp bò ngâm mắm nhĩ", PriceMenu = Utils.ConvertMoney("1000000"), Count = 2, DoStatus = "Hoàn tất", SumMoney = Sum() });
    cookviewmodel.Add(new CookModel { Menu = "Bắp bò ngâm mắm nhĩ", PriceMenu = Utils.ConvertMoney("1000000"), Count = 1, DoStatus = "Hoàn tất" });
    cookviewmodel.Add(new CookModel { Menu = "Bắp bò ngâm mắm nhĩ", PriceMenu = Utils.ConvertMoney("1000000"), Count = 1, DoStatus = "Hoàn tất" });
}

public double Sum()
{
    var count  = from f in cookviewmodel
                        select f.Count;
    var price = from p in cookviewmodel
                       select p.PriceMenu;
    
    return Convert.ToInt32(count) * Convert.ToDouble(count); 
}

I need to get the value of Count and PriceMenu and add them together

Class Utils :

class Utils
{
     public static string ConvertMoney(string value)
     {
         CultureInfo cul = CultureInfo.GetCultureInfo("vi-VN");
         return double.Parse(value).ToString("#,###", cul.NumberFormat); 
     }
}

CodePudding user response：

I would do like this

internal class CookModel
{
    public string Menu { get; set; }
    public double PriceMenu { get; set; }
    public double  Count { get; set; }
    public double SumMoney => Count * PriceMenu;
}

CodePudding user response：

First, change your PriceMenu variable to be of numerical value (e.g. double) and not text (string), then you can use Select operator to map 'price multiplied by count';

totalCost = cookviewmodel.Select(vm => vm.Count * vm.PriceMenu).Sum()

ps. Maybe "ordersReceived" is a better variable name then "cookviewmodel" ?