C daily development notes -- solve the problem that one set references another set, resulting in changes together

Deep copy （ Encapsulated as a generic generic generic method, copy and use ）：

/// <summary>
///  Deep copy set method ---- Solve the problem that one set refers to another set, resulting in changes together 
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list1"></param>
/// <param name="list2"></param>
/// <returns></returns>
public static List<T> DeepCopyList<T>(IList<T> list1 , out List<T> list2)
{
    
	MemoryStream ms = new MemoryStream();
	BinaryFormatter bf = new BinaryFormatter();
	bf.Serialize(ms, list1);
	ms.Position = 0;
	list2 = (List<T>)bf.Deserialize(ms);
	return list2;
}

Class used ( Class needs to be marked with serializable attributes ):

[Serializable]
public class Student
{
    
	public int Id {
     get; set; }

	public int Age {
     get; set; }

}

The test method :

static void Main(string[] args)
{
    
	var list1 = new List<Student>();
	Student stu1 = new Student();
	stu1.Id = 1;
	stu1.Age = 12;
	list1.Add(stu1);

	Student stu2 = new Student();
	stu2.Id = 2;
	stu2.Age = 21;
	list1.Add(stu2);

	Student stu3 = new Student();
	stu3.Id = 3;
	stu3.Age = 23;
	list1.Add(stu3);

	var list2 = new List<Student>();
	list2 = DeepCopyList<Student>(list1,out list2).Where(s => s.Id == 1).ToList();

	var ss = list2.Select(s => s.Age = 33).ToList();
}

result :

turn json

/// <summary>
///  turn json Method ---- Solve the problem that one set refers to another set, resulting in changes together 
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <returns></returns>
public static List<T> Clone<T>(this List<T> list) where T : new()
{
    
	var str = JsonConvert.SerializeObject(list);
	return JsonConvert.DeserializeObject<List<T>>(str);
}

Class used ( Class needs to be marked with serializable attributes ):

[Serializable]
public class Student
{
    
	public int Id {
     get; set; }

	public int Age {
     get; set; }

}

The test method :

static void Main(string[] args)
{
    
	var list1 = new List<Student>();
	Student stu1 = new Student();
	stu1.Id = 1;
	stu1.Age = 12;
	list1.Add(stu1);

	Student stu2 = new Student();
	stu2.Id = 2;
	stu2.Age = 21;
	list1.Add(stu2);

	Student stu3 = new Student();
	stu3.Id = 3;
	stu3.Age = 23;
	list1.Add(stu3);

	var list2 = new List<Student>();
	list2 = Clone<Student>(list1).Where(s => s.Id == 1).ToList();

	var ss = list2.Select(s => s.Age = 33).ToList();
}

result :