I was trying to figure out how to replace the nested from clause to a method syntax. I was trying with .Select or .SelectMany, but I didn't manage to get the same result.
var query = (from DirectToStoreStore s in dtsOrder.Stores
from DirectToStoreProduct p in s.Products
where p.DirectToStoreOrderLineID == directToOrderLineID
select p);
There's plenty of ways you could write it.
var query = dtsOrder.Stores.Cast<DirectToStoreStore>()
.SelectMany(s => s.Products.Cast<DirectToStoreProduct>()
.Where(p => p.DirectToStoreOrderLineID == directToOrderLineID)
);
Though the casts may not be necessary, but they're only there since you explicitly declared them in your query. It'll probably be safe to remove them.
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