dhei/Stackoverflow Highest Voted C# Questions.md

## Stackoverflow Highest Voted C# Questions.md

      
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              Stackoverflow Highest Voted C# Questions.md
            
          
    LINQ (https://stackoverflow.com/questions/tagged/linq)

Question: Which method performs better: .Any() vs .Count() > 0? (SO link)
Answer: In general .Any() is more performant with better clarity of intention on IEnumerable<T>. If you are starting with something that has a .Length or .Count (such as ICollection, IList, List, etc) - then this will be the fastest option.
Question: Using LINQ to remove elements from a List (SO link)
Answer: .RemoveAll() from IList or .Where() will do the trick.
authorsList.RemoveAll(x => x.FirstName == "Bob");
authorsList = authorsList.Where(x => x.FirstName != "Bob").ToList();
Question: LINQ's Distinct() on a particular property (SO link)
Answer: Use .GroupBy() and pick the first item.
List<Person> distinctPeople = allPeople
  .GroupBy(p => new {p.PersonId, p.FavoriteColor} )
  .Select(g => g.First())
  .ToList();