using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;

namespace Infrastructure.Extensions
{
    public static class QueryableExtensions
    {
        public static IQueryable<TSource> WhereIf<TSource>(this IQueryable<TSource> source, bool condition, Expression<Func<TSource, bool>> predicate)
        {
            return condition ? source.Where(predicate) : source;
        }

        public static List<TSource> Paged<TSource>(this IQueryable<TSource> source, int pageIndex, int pageSize)
        {
            return source.Skip(pageSize * (pageIndex - 1)).Take(pageSize).ToList();
        }
    }
}