Dictionary<TKey, TValue>를 deep copy하는 방법

예전에 XmlSerializer를 이용한 값 복사를 설명했었습니다.

XML Serializer 를 이용한 값 복사
; https://www.sysnet.pe.kr/2/0/577

XmlSerializer xs = new XmlSerializer(typeof(Dictionary<string, int>));

System.NotSupportedException occurred
  HResult=0x80131515
  Message=The type System.Collections.Generic.Dictionary`2[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] is not supported because it implements IDictionary.
  Source=System.Xml
  StackTrace:
   at System.Xml.Serialization.TypeScope.GetDefaultIndexer(Type type, String memberInfo)
   at System.Xml.Serialization.TypeScope.ImportTypeDesc(Type type, MemberInfo memberInfo, Boolean directReference)
   at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type, MemberInfo source, Boolean directReference, Boolean throwOnError)
   at System.Xml.Serialization.ModelScope.GetTypeModel(Type type, Boolean directReference)
   at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(Type type, XmlRootAttribute root, String defaultNamespace)
   at System.Xml.Serialization.XmlSerializer..ctor(Type type, String defaultNamespace)
   at System.Xml.Serialization.XmlSerializer..ctor(Type type)
   at ConsoleApp1.Program.Main(String[] args) in C:\ConsoleApp1\ConsoleApp1\Program.cs:line 36

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, int> dict = new Dictionary<string, int>();
            dict.Add("5", 5);
            dict.Add("6", 6);

            Dictionary<string, int> dict2 = CloneData(dict);
            dict.Remove("6");

            foreach (var item in dict)
            {
                Console.WriteLine(item.Value);
            }

            Console.WriteLine();

            foreach (var item in dict2)
            {
                Console.WriteLine(item.Value);
            }
        }

        public static TData CloneData<TData>(TData data) where TData : class
        {
            if (data == null)
            {
                return null;
            }

            MemoryStream ms = new MemoryStream();

            BinaryFormatter xs = new BinaryFormatter();
            xs.Serialize(ms, data);

            ms.Position = 0;

            return (TData)xs.Deserialize(ms);
        }
    }
}

/*
// 출력 결과
5

5
6
*/