Adding OR expressions in a loop in Linq

Question

I have a variable number of OR conditions that I want to put together into one Linq query.

How do I do this in a loop? Basically, the final query is to

Answer 1

A less-than-optimized version (pray that the backend will do the necessary lifting and optimization).

public static IQueryable Any(this IQueryable q, 
  params Expression>[] preds)
{
  var par = Expression.Parameter(typeof(T), "x");

  Expression body = Expression.Constant(false);

  foreach (var pred in preds)
  {
    body = Expression.OrElse(body, Expression.Invoke(pred, par));
  }

  var ff = Expression.Lambda(body, par) as Expression>;

  return q.Where(ff);
}

static void Main(string[] args)
{
  var q = new[] { "jim", "bob", "Jon", "leppie" }.AsQueryable();

  Expression>[] preds =
  {
    x => x == "Jon",
    x => x == "Skeet",
    x => x == "leppie"
  };

  var result = q.Any(preds).ToArray();
}