how to use in clause in Linq Query and pass it dynamically from code - asp.net-core

Question

I am converting my project to EF Core in my old project I have a query running.
IDictionary<int, IGrouping<int, UserPurchaseItemAddonWithAmount>> addons =
context.Fetch<UserPurchaseItemAddonWithAmount>($"Select UPIA.*, EA.Amount From UserPurchaseItemAddons UPIA Inner Join ExtraAddons EA on UPIA.AddonID = EA.AddonID Where UPIA.UserPurchaseItemID in ({string.Join(',', userPurchaseItems.Select(S => S.UserPurchaseItemID))})")
.GroupBy(G => G.UserPurchaseItemID).ToDictionary(D => D.Key);
I need to convert this query in to Linq query what I am doing is below
IDictionary<int, IGrouping<int, UserPurchaseItemAddonWithAmount>> addons =
(from f in context.UserPurchaseItemAddons
join s in context.ExtraAddons
on f.AddonId equals s.AddonId
select new
{
Amount = s.Amount,
UserPurchaseItemAddonID = f.UserPurchaseItemAddonId,
UserPurchaseItemID = f.UserPurchaseItemId,
BranchItemVariantID = f.BranchItemVariantId,
AddonID = f.AddonId,
UserID = f.UserId,
IsDeleted = f.IsDeleted,
ModifiedOn = f.ModifiedOn,
ModifiedBy = f.ModifiedBy,
Reason = f.Reason,
}).GroupBy(G => G.UserPurchaseItemID).ToDictionary(D => D.Key);
This query is causing a compiler error related to casting to IGrouping<int, UserPurchaseItemAddonWithAmount> to an anonymous type. The other thing is that how can I apply in clause in where condition in above query, just like the first query .
class
public class UserPurchaseItemAddonWithAmount
{
public decimal Amount { get; set; }
public int UserPurchaseItemAddonID { get; set; }
public int UserPurchaseItemID { get; set; }
public int BranchItemVariantID { get; set; }
public int AddonID { get; set; }
public int UserID { get; set; }
public bool IsDeleted { get; set; }
public DateTime? ModifiedOn { get; set; }
public int? ModifiedBy { get; set; }
public string? Reason { get; set; }
}

Answer 1

Try the following query. Main mistake that you have returned anonymous class.
var purchaseItemIds = userPurchaseItems.Select(S => S.UserPurchaseItemID);
IDictionary<int, IGrouping<int, UserPurchaseItemAddonWithAmount>> addons =
(from f in context.UserPurchaseItemAddons
join s in context.ExtraAddons on f.AddonId equals s.AddonId
where purchaseItemIds.Contains(f.UserPurchaseItemID)
select new UserPurchaseItemAddonWithAmount
{
Amount = s.Amount,
UserPurchaseItemAddonID = f.UserPurchaseItemAddonId,
UserPurchaseItemID = f.UserPurchaseItemId,
BranchItemVariantID = f.BranchItemVariantId,
AddonID = f.AddonId,
UserID = f.UserId,
IsDeleted = f.IsDeleted,
ModifiedOn = f.ModifiedOn,
ModifiedBy = f.ModifiedBy,
Reason = f.Reason,
})
.AsEnumerable()
.GroupBy(G => G.UserPurchaseItemID)
.ToDictionary(D => D.Key);