DymWebForm-Archive/DymWebForm/Common/Linq/Extensions.cs

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

namespace DymWebForm.Common.Linq
{
    internal static class Extensions
    {
        public static T2[] SelectArray<T1, T2>(this IEnumerable<T1> source, Func<T1, T2> selector)
        {
            return source.Select(selector).ToArray();
        }

        public static T2[] SelectArray<T1, T2>(this IQueryable<T1> source, Expression<Func<T1, T2>> selector)
        {
            return source.Select(selector).ToArray();
        }

        public static T2 FirstValue<T1, T2>(this Dictionary<T1, T2> source)
        {
            foreach (var item in source)
            {
                return item.Value;
            }

            throw new InvalidOperationException("No items in dic");
        }

        public static IEnumerable<T> ForEach<T>(this IEnumerable<T> source, Action<T> proc)
        {
            var arr = source as T[] ?? source.ToArray();
            foreach (var item in arr)
                proc(item);

            return arr;
        }

        public static IEnumerable<T> ForEach<T>(this IQueryable<T> source, Action<T> proc)
        {
            foreach (var item in source)
                proc(item);

            return source;
        }
    }
}