I have a list of Foo. Foo has properties Bar and Lum. Some Foos have identical values for Bar. How can I use lambda/linq to group my Foos by Bar so I can iterate over each grouping's Lums?
+2
A:
var q = from x in list
group x by x.Bar into g
select g;
foreach (var group in q)
{
Console.WriteLine("Group " + group.Key);
foreach (var item in group)
{
Console.WriteLine(item.Bar);
}
}
aku
2008-09-05 16:06:29
+3
A:
Enjoy:
var foos = new List<Foo> {
new Foo{Bar = 1,Lum = 1},
new Foo{Bar = 1,Lum = 2},
new Foo{Bar = 2,Lum = 3},
};
// Using language integrated queries:
var q = from foo in foos
group foo by foo.Bar into groupedFoos
let lums = from fooGroup in groupedFoos
select fooGroup.Lum
select new { Bar = groupedFoos.Key, Lums = lums };
// Using lambdas
var q = foos.GroupBy(x => x.Bar).
Select(y => new {Bar = y.Key, Lums = y.Select(z => z.Lum)});
foreach (var group in q)
{
Console.WriteLine("Lums for Bar#" + group.Bar);
foreach (var lum in group.Lums)
{
Console.WriteLine(lum);
}
}
To learn more about LINQ read 101 LINQ Samples
aku
2008-09-06 07:34:15