複製Dictionary

修改第一個Dictionary(被複製的對象)不會影響到第二個Dictionary。
程式碼

using System;
using System.Collections.Generic;

class Program
{
 static void Main()
 {
  //
  // Create and initialize Dictionary.
  //
  Dictionary dictionary = new Dictionary();
  dictionary.Add("cat", 1);
  dictionary.Add("dog", 3);
  dictionary.Add("iguana", 5);

  //
  // 複製Dictionary 到第二個物件
  //
  Dictionary copy = new Dictionary(dictionary);

  //
  // Change the first Dictionary. It won't change the copy.
  //
  dictionary.Add("fish", 4);

  //
  // Display the first Dictionary.
  //
  Console.WriteLine("--- Dictionary 1 ---");
  foreach (var pair in dictionary)
  {
   Console.WriteLine(pair);
  }
  //
  // Display the second Dictionary.
  //
  Console.WriteLine("--- Dictionary 2 ---");
  foreach (var pair in copy)
  {
   Console.WriteLine(pair);
  }
 }
}

輸出

--- Dictionary 1 ---
[cat, 1]
[dog, 3]
[iguana, 5]
[fish, 4]
--- Dictionary 2 ---
[cat, 1]
[dog, 3]
[iguana, 5]

摘要
複製整個Dictionary到一個新的Dictionary。Dictionary的類別並沒有定義複製的方法，需使用複製建構式來進行複製。