泛型方法擴充

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Reflection;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
    public static class Program
    {
        /// <summary>
        /// 入口函數
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            List<string> oldStrList = new List<string>()
            {
                "12","ZH","CN","2E","0A","56","FF","00"
            };

            Console.Write("Old List：" + oldStrList.Count + " ->");
            foreach (string str in oldStrList) Console.Write(str + " ");

            Console.WriteLine(""); 

            List<string> newHexList = oldStrList.HexFilter(
                (p) => 
                    {
                        bool blStatus = false;

                        try
                        {
                            Convert.ToInt32(p, 16); blStatus = true;
                        }
                        catch
                        {
                            blStatus = false;
                        }

                        return blStatus; 
                    }
                ).ToList();

            Console.Write("New List：" + newHexList.Count + " ->");
            foreach (string str in newHexList) Console.Write(str + " ");

            Console.ReadLine();
        }
        /// <summary>
        /// 過濾掉非十六進位字元
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source"></param>
        /// <param name="predicate"></param>
        /// <returns></returns>
        static IEnumerable<T> HexFilter<T>(this IEnumerable<T> source, Func<T, bool> predicate)
        {
            foreach (T item in source)
            {
                if (predicate(item)) yield return item;
            }
        }
    }
}