Linq mehrere beitreten, dann GroupBy zusammen mit OrderBy, versuchte alles, konnte ich

Question

finden

var CartItemsGroup = (from Cart in db.BuyOnlineCartMasters // orderby this Cart.CartID descending 
    join CartDetails in db.BuyOnlineCartDetails 
     on Cart.CartID equals CartDetails.CartID 

    join ProductMaster in db.tblBuyOnlineMasters.Where(x => x.CompanyID == CompanyID) 
     on CartDetails.BuyOnlineID equals ProductMaster.BuyOnlineID 

//I tried here did not work , orderby Cart.CartID descending 

    select new { Cart.CartID, Cart.InvoiceNumber, ProductMaster.CompanyID, 
    ProductMaster.Price, ProductMaster.Title, ProductMaster.OfferPrice, 
    CartDetails.SoldPrice, CartDetails.Qty, CartDetails.ShippingStatus, 
    CartDetails.DeliveryStatus, TotalAmt = (CartDetails.Qty * CartDetails.SoldPrice)} 

    into x 

//I tried here did not work, orderby x.CartID descending 

//TODO: where conditions are not set for cart like payment paid etc 
    group x by x.CartID) 
    .ToList(); 

Ich möchte von der cartId das Ergebnis bestellen, weil der groupby Klausel ich nicht in der Lage bin, um es

getan

Answer 1

Die Bestellung muss nach Gruppierung sein.

Ihr Ziel zu erreichen, ersetzen

group x by x.CartID 

mit

group x by x.CartID into g 
orderby g.Key descending 
select g 

Answer 2

zunächst Ihre Daten und wählen Sie dann Gruppe. Das wird funktionieren. Eine Probe mit meinen Tabellen

from data in 
    (from o in DB.GM_ORDER 
     join g in DB.GM_ORDERITEMS on o.ORDERID equals g.ORDERID 
     join i in DB.GM_ITEM on g.ITEMID equals i.ITEMID 
    where o.ORDERID<=11160 /* or any other filter to be applied */ 
    orderby o.ORDERID descending, i.ITEMCODE ascending /* in your case ORDERID will be CARTID. Continue sorting within the ORDER/CART with a second parameter (in your case can be delivery status) */ 
    select new { o.ORDERID, i.ITEMCODE, g.ITEMID, Total = (g.CURR_PRICE * g.QTY) } 
) select data 
into x 
group x by x.ORDERID