foreach(var item in items.Where(x => x.SomeCondition == true).Skip(1))
{
item.OneThing = true;
item.AnotherThing = true;
}
For the item that was skipped using .Skip(1), I also need to set .AnotherThing to true. I can iterate everything without .Skip(1) and set .AnotherThing to true, then iterate everything with .Skip(1) and set .OneThing to true. Is there a more elegant way to do this, rather than looping through the collection twice?
Edit: What if there was a .YetAnotherThing property, which needed to be set on the item that was skipped using .Skip(1)?

Well it sounds like you don't want to use Skip in this case. Just use a local variable to remember whether this is the first iteration or not.
bool firstItem = true;
foreach(var item in items.Where(x => x.SomeCondition))
{
item.AnotherThing = true;
if (!firstItem)
{
item.OneThing = true;
}
firstItem = false;
}
See more on this question at Stackoverflow