Extension method for combining predicates and extension method for or conditions in linq queries.

gistfile1.cs

public static IQueryable<T> WhereAny<T>(this IQueryable<T> source, params Expression<Func<T, bool>>[] predicates)
{
    Expression<Func<T, bool>> filter = t => false;

    foreach (var predicate in predicates)
        filter = filter.Combine(Expression.OrElse, predicate);

    return source.Where(filter);
}

private static Expression<Func<T, bool>> Combine<T>(this Expression<Func<T, bool>> predicate, Func<Expression, Expression, BinaryExpression> combination, Expression<Func<T, bool>> withPredicate)
{
    var invocation = Expression.Invoke(withPredicate, predicate.Parameters);
    var combined = combination(predicate.Body, invocation);
    return Expression.Lambda<Func<T, bool>>(combined, predicate.Parameters);
}