When to use .First and when to use .FirstOrDefault with LINQ?

Question

I\'ve searched around and haven\'t really found a clear answer as to when you\'d want to use .First and when you\'d want to use .FirstOrDefault wit

Answer 1

Ok let me give my two cents. First / Firstordefault are for when you use the second constructor. I won't explain what it is, but it's when you would potentially always use one because you don't want to cause an exception.

person = tmp.FirstOrDefault(new Func((p) =>
{
    return string.IsNullOrEmpty(p.Relationship);
}));