using System;using System.Collections.Generic;//用到了容器類using System.Text.RegularExpressions;//用到了正則表達式class Collections{ //C#容器Dictionary的基本使用 public static void dictionaryTest() {  Dictionary<string, int> dict = new Dictionary<string, int>();  dict.Add("K1", 123);  dict["K2"] = 456;  dict.Add("K3", 789);  Console.WriteLine("數據字典dict中的Key-value對為：");  foreach (KeyValuePair<string, int> k in dict)  {   Console.WriteLine("{0}-{1}; ", k.Key, k.Value); //K1-123; K2-456; K3-789;  }  } //C#容器List與HashSet的基本使用 public static void listTest() {  List<int> list = new List<int>();  Console.WriteLine("輸入#，結束輸入！");  Regex regex = new Regex("^[0-9]*$");  String input_string = "";  while (true)  {   Console.Write("請輸入數組的數字：");   input_string = Console.ReadLine();   if (input_string.Trim().CompareTo("#") == 0)   {    break;   }   else   {    if (regex.IsMatch(input_string))//利用正則表達式判斷是否輸入的是數字    {     list.Add(int.Parse(input_string));    }    else    {     Console.WriteLine("輸入的不是數字！請重新輸入！");    }   }  }  Console.WriteLine("輸入的List為：");  for (int i = 0; i < list.Count; i++)  {   Console.Write(list[i] + " ");  }  Console.WriteLine();  list = new List<int>(new HashSet<int>(list));//利用集合為list去重  Console.WriteLine("List利用Set去重后為：");    for (int i = 0; i < list.Count; i++)  {   Console.Write(list[i] + " ");  }  Console.WriteLine(); ;  } public static void Main(String[] args) {  dictionaryTest();  listTest();  Console.ReadKey();//等待用戶按回車才結束程序 }}