ToLookup | Notion

p.Job); foreach(var theGroup in groupedByJob) { Console.WriteLine( "{0} are {1}s", string.Join(",", theGroup.Select(g => g.Name).ToArray()), theGroup.Key); } //Fizz,Buzz are Developers //Foo,Bar are Astronauts"> p.Job); foreach(var theGroup in groupedByJob) { Console.WriteLine( "{0} are {1}s", string.Join(",", theGroup.Select(g => g.Name).ToArray()), theGroup.Key); } //Fizz,Buzz are Developers //Foo,Bar are Astronauts"> p.Job); foreach(var theGroup in groupedByJob) { Console.WriteLine( "{0} are {1}s", string.Join(",", theGroup.Select(g => g.Name).ToArray()), theGroup.Key); } //Fizz,Buzz are Developers //Foo,Bar are Astronauts">

var persons = new[] {
    new { Name="Fizz", Job="Developer"},
    new { Name="Buzz", Job="Developer"},
    new { Name="Foo", Job="Astronaut"},
    new { Name="Bar", Job="Astronaut"},
};

var groupedByJob = persons.ToLookup(p => p.Job);

foreach(var theGroup in groupedByJob)
{
    Console.WriteLine(
        "{0} are {1}s", 
        string.Join(",", theGroup.Select(g => g.Name).ToArray()),
        theGroup.Key);
}

//Fizz,Buzz are Developers
//Foo,Bar are Astronauts