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Can this LINQ+foreach loop be converted to LINQ?

deleyd asked
Last Modified: 2019-12-04
Can the following be refactored to a single LINQ statement?
var result = 
    from a in listA
    from b in listA
    where a != b
    select new C(a,b);

var newResultList = new List<C>();

foreach (C c in result)
    if (c.Sometest()) { newResultList.Add(c); }

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I'm looking for a way in a LINQ statement to create a new instance of a class C so I can then test by calling c.Sometest() which returns a Boolean, and that determines if the element gets filtered out or left in the collection.

Is that possible?
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