CODEWITHSUNDEEP
c#linq
ahmet kocadogan
ahmet kocadogan

Reputation: 137

How to get Sum from List in another List as a property with linq

My classes are like below.

public class ModelMMaster
{
    public string OrderID { get; set; }
    public bool IsActive { get; set; }
    public List<ModelDetail> _detail { get; set; }
}
public class ModelDetail
{
    public string SKUCode { get; set; }
    public int Quantity { get; set; }
    public double Price { get; set; }
}

And I have an order list like 

List<ModelMMaster> _listMaster = new List<ModelMMaster>

I want to calculate Sum(Quantity * Price) with LINQ, over _listMaster.

I am stuck at this. 

double _sum =_listMaster.Where(f => f.IsActive == true).Select(f => f._detail)......

How can i calculate Sum(Quantity * Price) from _listMaster with LINQ?

Upvotes: 2

Views: 1949

Answers (2)

Anu Viswan
Anu Viswan

Reputation: 18155

You can achieve it couple of ways

Option 1

double _sum =_listMaster.Where(f => f.IsActive)
                         .Sum(x=>x._detail.Sum(c=>c.Price * c.Quantity));

Option 2

double _sum =_listMaster.Where(f => f.IsActive)
                        .Aggregate(0d,(result,item)=>result + item._detail.Sum(x=>x.Price * x.Quantity));

Option 3

double _sum =_listMaster.Where(f => f.IsActive)
                        .SelectMany(x=>x._detail)
                        .Sum(x=>x.Price * x.Quantity);

Upvotes: 8

Basil Kosovan
Basil Kosovan

Reputation: 1069

        List<ModelMMaster> _listMaster = new List<ModelMMaster>();
        List<ModelDetail> _listDetail = new List<ModelDetail>();

        _listDetail.Add(new ModelDetail { SKUCode = "SKUCode-1", Quantity = 1, Price = 1 });
        _listMaster.Add(new ModelMMaster { OrderID = "OrderID-1", IsActive = true, _detail = _listDetail });

        _listDetail = new List<ModelDetail>();
        _listDetail.Add(new ModelDetail { SKUCode = "SKUCode-2", Quantity = 2, Price = 2 });
        _listDetail.Add(new ModelDetail { SKUCode = "SKUCode-3", Quantity = 3, Price = 3 });
        _listMaster.Add(new ModelMMaster { OrderID = "OrderID-2", IsActive = true, _detail = _listDetail });

        var totalSum = _listMaster.Where(t=>t.IsActive).SelectMany(t => t._detail).Sum(t => t.Quantity * t.Price);

Upvotes: 4

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