All - Grouped

Query
public void Linq72()
{
List products = GetProductList();

var productGroups =
from p in products
group p by p.Category into g
where g.All(p => p.UnitsInStock > 0)
select new { Category = g.Key, Products = g };

ObjectDumper.Write(productGroups, 1);
}
Lambda Expression
public void Linq72()
{
List products = GetProductList();

var productGroups =
products.GroupBy(prod => prod.Category)
.Where(prodGroup => prodGroup.All(p => p.UnitsInStock > 0))
.Select(prodGroup => new {Category = prodGroup.Key, Products = prodGroup});

ObjectDumper.Write(productGroups, 1);
}
Output
Category=Beverages Products=...
Products: ProductID=1 ProductName=Chai Category=Beverages UnitPrice=18.0000 UnitsInStock=39
Products: ProductID=2 ProductName=Chang Category=Beverages UnitPrice=19.0000 UnitsInStock=17
Products: ProductID=24 ProductName=Guaraná Fantástica Category=Beverages UnitPrice=4.5000 UnitsInStock=20
Products: ProductID=34 ProductName=Sasquatch Ale Category=Beverages UnitPrice=14.0000 UnitsInStock=111
Products: ProductID=35 ProductName=Steeleye Stout Category=Beverages UnitPrice=18.0000 UnitsInStock=20
Products: ProductID=38 ProductName=Côte de Blaye Category=Beverages UnitPrice=263.5000 UnitsInStock=17
Products: ProductID=39 ProductName=Chartreuse verte Category=Beverages UnitPrice=18.0000 UnitsInStock=69
Products: ProductID=43 ProductName=Ipoh Coffee Category=Beverages UnitPrice=46.0000 UnitsInStock=17
Products: ProductID=67 ProductName=Laughing Lumberjack Lager Category=Beverages UnitPrice=14.0000 UnitsInStock=52
Products: ProductID=70 ProductName=Outback Lager Category=Beverages UnitPrice=15.0000 UnitsInStock=15
Products: ProductID=75 ProductName=Rhönbräu Klosterbier Category=Beverages UnitPrice=7.7500 UnitsInStock=125
Products: ProductID=76 ProductName=Lakkalikööri Category=Beverages UnitPrice=18.0000 UnitsInStock=57
Category=Produce Products=...
Products: ProductID=7 ProductName=Uncle Bob's Organic Dried Pears Category=Produce UnitPrice=30.0000 UnitsInStock=15
Products: ProductID=14 ProductName=Tofu Category=Produce UnitPrice=23.2500 UnitsInStock=35
Products: ProductID=28 ProductName=Rössle Sauerkraut Category=Produce UnitPrice=45.6000 UnitsInStock=26
Products: ProductID=51 ProductName=Manjimup Dried Apples Category=Produce UnitPrice=53.0000 UnitsInStock=20
Products: ProductID=74 ProductName=Longlife Tofu Category=Produce UnitPrice=10.0000 UnitsInStock=4
Category=Seafood Products=...
Products: ProductID=10 ProductName=Ikura Category=Seafood UnitPrice=31.0000 UnitsInStock=31
Products: ProductID=13 ProductName=Konbu Category=Seafood UnitPrice=6.0000 UnitsInStock=24
Products: ProductID=18 ProductName=Carnarvon Tigers Category=Seafood UnitPrice=62.5000 UnitsInStock=42
Products: ProductID=30 ProductName=Nord-Ost Matjeshering Category=Seafood UnitPrice=25.8900 UnitsInStock=10
Products: ProductID=36 ProductName=Inlagd Sill Category=Seafood UnitPrice=19.0000 UnitsInStock=112
Products: ProductID=37 ProductName=Gravad lax Category=Seafood UnitPrice=26.0000 UnitsInStock=11
Products: ProductID=40 ProductName=Boston Crab Meat Category=Seafood UnitPrice=18.4000 UnitsInStock=123
Products: ProductID=41 ProductName=Jack's New England Clam Chowder Category=Seafood UnitPrice=9.6500 UnitsInStock=85
Products: ProductID=45 ProductName=Rogede sild Category=Seafood UnitPrice=9.5000 UnitsInStock=5
Products: ProductID=46 ProductName=Spegesild Category=Seafood UnitPrice=12.0000 UnitsInStock=95
Products: ProductID=58 ProductName=Escargots de Bourgogne Category=Seafood UnitPrice=13.2500 UnitsInStock=62
Products: ProductID=73 ProductName=Röd Kaviar Category=Seafood UnitPrice=15.0000 UnitsInStock=101
Category=Confections Products=...
Products: ProductID=16 ProductName=Pavlova Category=Confections UnitPrice=17.4500 UnitsInStock=29
Products: ProductID=19 ProductName=Teatime Chocolate Biscuits Category=Confections UnitPrice=9.2000 UnitsInStock=25
Products: ProductID=20 ProductName=Sir Rodney's Marmalade Category=Confections UnitPrice=81.0000 UnitsInStock=40
Products: ProductID=21 ProductName=Sir Rodney's Scones Category=Confections UnitPrice=10.0000 UnitsInStock=3
Products: ProductID=25 ProductName=NuNuCa Nuß-Nougat-Creme Category=Confections UnitPrice=14.0000 UnitsInStock=76
Products: ProductID=26 ProductName=Gumbär Gummibärchen Category=Confections UnitPrice=31.2300 UnitsInStock=15
Products: ProductID=27 ProductName=Schoggi Schokolade Category=Confections UnitPrice=43.9000 UnitsInStock=49
Products: ProductID=47 ProductName=Zaanse koeken Category=Confections UnitPrice=9.5000 UnitsInStock=36
Products: ProductID=48 ProductName=Chocolade Category=Confections UnitPrice=12.7500 UnitsInStock=15
Products: ProductID=49 ProductName=Maxilaku Category=Confections UnitPrice=20.0000 UnitsInStock=10
Products: ProductID=50 ProductName=Valkoinen suklaa Category=Confections UnitPrice=16.2500 UnitsInStock=65
Products: ProductID=62 ProductName=Tarte au sucre Category=Confections UnitPrice=49.3000 UnitsInStock=17
Products: ProductID=68 ProductName=Scottish Longbreads Category=Confections UnitPrice=12.5000 UnitsInStock=6
Category=Grains/Cereals Products=...
Products: ProductID=22 ProductName=Gustaf's Knäckebröd Category=Grains/Cereals UnitPrice=21.0000 UnitsInStock=104
Products: ProductID=23 ProductName=Tunnbröd Category=Grains/Cereals UnitPrice=9.0000 UnitsInStock=61
Products: ProductID=42 ProductName=Singaporean Hokkien Fried Mee Category=Grains/Cereals UnitPrice=14.0000 UnitsInStock=26
Products: ProductID=52 ProductName=Filo Mix Category=Grains/Cereals UnitPrice=7.0000 UnitsInStock=38
Products: ProductID=56 ProductName=Gnocchi di nonna Alice Category=Grains/Cereals UnitPrice=38.0000 UnitsInStock=21
Products: ProductID=57 ProductName=Ravioli Angelo Category=Grains/Cereals UnitPrice=19.5000 UnitsInStock=36
Products: ProductID=64 ProductName=Wimmers gute Semmelknödel Category=Grains/Cereals UnitPrice=33.2500 UnitsInStock=22
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