score:11
Accepted answer
An alternative solution with using SelectMany (it keeps the duplicates):
var combined = list.Where(c => c.Flag)
.SelectMany(c => new[] { c.Present, c.Previous });
Assert.AreEqual(4, combined.Count());
score:0
Does the final ordering of the strings in the list matter? If not, it seems like this would be the clearest way to accomplish this:
var strings = new List<String>();
foreach (var value in list.Where(c => c.Flag))
{
strings.Add(value.Present);
strings.Add(value.Previous);
}
Source: stackoverflow.com
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