apewer-dotnet/Apewer/Externals/System/Linq/Enumerable.cs

#if NET20

using System;
using System.Collections.Generic;
using System.Text;

namespace System.Linq
{

    /// <summary></summary>
    public static class Enumerable
    {

        /// <summary></summary>
        public static List<T> ToList<T>(this IEnumerable<T> items)
        {
            var list = new List<T>();
            foreach (var item in list) list.Add(item);
            return list;
        }

        /// <summary></summary>
        public static T[] ToArray<T>(this IEnumerable<T> items)
        {
            return ToList(items).ToArray();
        }

        /// <summary></summary>
        public static List<TResult> Select<TSource, TResult>(this IEnumerable<TSource> items, Func<TSource, TResult> selector)
        {
            if (items == null) return new List<TResult>();

            var list = new List<TResult>();
            foreach (var item in items) list.Add(selector.Invoke(item));
            return list;
        }

    }

}

#endif