Edward Tanguay Edward Tanguay - 1 year ago 72
C# Question

How can I access the loop index inside a LINQ select?

This code:

var customers = from cust in Customers
group cust by new {cust.Country} into grouping
select new
{
Country = grouping.Key.Country,
Customers = grouping
};

customers.ToList().ForEach(g =>
Console.WriteLine("{0} has {1} customers: {2}",
g.Country,
g.Customers.Count(),
String.Join(", ",g.Customers.Select(x => "#. " + x.CompanyName).ToArray())
));

customers.Dump();


yields these results:

Argentina has 3 customers: #. Cactus Comidas para llevar, #. Océano Atlántico Ltda., #. Rancho grande
Austria has 2 customers: #. Ernst Handel, #. Piccolo und mehr
Belgium has 2 customers: #. Maison Dewey, #. Suprêmes délices
Brazil has 9 customers: #. Comércio Mineiro, #. Familia Arquibaldo, #. Gourmet Lanchonetes, #. Hanari Carnes, #. Que Delícia, #. Queen Cozinha, #. Ricardo Adocicados, #. Tradição Hipermercados, #. Wellington Importadora
Canada has 3 customers: #. Bottom-Dollar Markets, #. Laughing Bacchus Wine Cellars, #. Mère Paillarde
Denmark has 2 customers: #. Simons bistro, #. Vaffeljernet
...


How can I replace the "#" with an index/count so that I get results like these:

Argentina has 3 customers: 1. Cactus Comidas para llevar, 2. Océano Atlántico Ltda., 3. Rancho grande
...

Answer Source
customers.ToList().ForEach(g => Console.WriteLine("{0} has {1} customers: {2}",
    g.Country, 
    g.Customers.Count(), 
    string.Join(", ",
        g.Customers.Select((x, i) => i + ". " + x.CompanyName).ToArray())));
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