Max - Grouped

Query

public void Linq87()
{
    List products = GetProductList();
  
    var categories =
        from p in products
        group p by p.Category into g
        select new { Category = g.Key, MostExpensivePrice = g.Max(p => p.UnitPrice) };
  
    ObjectDumper.Write(categories);
}

Lambda Expression

public void Linq87()
{
    List products = GetProductList();
 
    var categories = products.GroupBy(prod => prod.Category)
        .Select(prodGroup => new {Category = prodGroup.Key, MostExpensivePrice = prodGroup.Max(p => p.UnitPrice)});
 
    ObjectDumper.Write(categories);
}

Output

Category=Beverages MostExpensivePrice=263.5000
Category=Condiments MostExpensivePrice=43.9000
Category=Produce MostExpensivePrice=53.0000
Category=Meat/Poultry MostExpensivePrice=123.7900
Category=Seafood MostExpensivePrice=62.5000
Category=Dairy Products MostExpensivePrice=55.0000
Category=Confections MostExpensivePrice=81.0000
Category=Grains/Cereals MostExpensivePrice=38.0000