选择中的Linq值之和

Question

So I have always came across this situation when using linq. Say I have code like below:

            var results = _context.Products.Select(d =>
            new Models.ProductData()
            {
                Id = d.ProductId,
                Name = d.Product.Name,
                Qty = d.Number.Where(y => y.Active && y.CodeId == 5 && y.Status == "NEW").Sum(y => y.FeeAmount),
                Qty1= d.Number.Where(y => y.Active && y.CodeId == 7 && y.Status == "NEW").Sum(y => y.Fee),
                Total = d.Number.Where(y => y.Active && y.CodeId == 5 && y.Status == "NEW").Sum(y => y.FeeAmount) + d.Number.Where(y => y.Active && y.CodeId == 7 && y.Status == "NEW").Sum(y => y.Fee)
            }
            );

For the total value, is there a better way to calculate the total without having to write out all the linq statements with + symbols in between? It would be a lot nicer to be able to write something like

Total = Qty + Qty1

I could omit the total from the initial mapping and the remap it grouping by Id and assigning the totals there by referencing Total = Qty + Qty1 but that just seems to round about.

Any suggestions are appreciated.

Answer 1

In your Models.ProductData class, define the Total property as follows:

public double Total {
    get {
        return this.Qty + this.Qty1;
    }
}

and avoid to set it in the Linq query.