C # - list member needs deep copy?

Question

I have a class with a member List<int>. If I want to clone an instance of this class, do I need a deep copy or insufficiently MemberwiseClone()incomplete copy?

We need a deep copy if at least one element is a reference to an object, right? Does this mean that List, DateTime, String, MyClass, ... will need a deep copy?

Answer 1

It completely depends on how you plan to use the copy.

If you make a shallow copy, for example

List<int> x = new List<int>() { 1, 2, 3, 4, 5 };
List<int> y = x;
y[2] = 4;

Then x will contain {1, 2, 4, 4, 5}

If you are making a deep copy of the list:

List<int> x = new List<int> { 1, 2, 3, 4, 5 };
List<int> y = new List<int>(x);
y[2] = 4;

Then x will contain {1, 2, 3, 4, 5}, and y will contain {1, 2, 4, 4, 5}

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Answer 2

List<int> originalList = new List{1, 2} :
List<int> newList = new List<int>();
foreach(int i in originalList)
newList.Add(i);
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Answer 3

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