using System;
using System.Collections;

namespace ConsoleApp42
{
    class Program
    {
        /// <summary>
        /// C# 判斷Hashtable是否包含某一項, 指定key是否存在
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            Hashtable ht = new Hashtable();
            ht.Add("user", "admin");
            ht.Add("name", "admin");

            // 判斷key是否已存在
            Console.WriteLine(ht.Contains("user"));
          
            Console.ReadLine();
        }
    }
}