Is there an equivalent of “None()” in LINQ?

Question

I\'ve been running into situations where I feel I\'m lacking a LINQ extension method which effectivelly checks if there is no match of the specified predicate in a collection. T

Answer 1

You can write your own Extension Method:

public static bool None(this IEnumerable collection, Func predicate)
{
  return collection.All(p=>predicate(p)==false);
}

Or on IQueryable as well

public static bool None(this IQueryable collection, Expression> predicate)
{
  return collection.All(p=> predicate(p)==false);
}