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//Prepare test data. Could be a set returned
//from a database query
var list = new List<int>();
for (int i = 0; i < 1000000; i++)
{
list.Add(i);
}
//Prepare a list to hold the results
//E.g list of all users born a certain year
var listOfInts = new List<IEnumerable<int>>();
for (int i = 0; i < 10; i++)
{
//Select from the large list all users
//that satisfy the criteria
listOfInts.Add(list.Where(a => a == i));
}
//Now, loop through all years and select the
//first user for every year
foreach(var l in listOfInts)
{
Console.WriteLine(l.First());
}
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