Copying a list to another (new list should not reference to old list)

Question

5.00/5 (1 vote)

See more:

Hi , guys

I want to copy a list to another in C#. The problem is that existing methods like copyto creates a new list from another list. But if I make some changes to new list the old list also gets changed. Its because of their reference type behaviour. If there any way (apart from foreach loop) to create a new list from another list which will not reference the same object ?
i think the (AddRange) is the same !
even if elements of my list are reference types not only value type

Posted 7-Aug-13 3:24am

Hamed_z

Updated 7-Aug-13 3:42am

v2

Add a Solution

Comments

Maciej Los 7-Aug-13 9:30am

What about Marshal.Copy[^]?

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Manas Bhardwaj · Answer 1 · 2013-08-07T03:29:00

Solution 1

try this:

C#

List<int32> original = new List<int32>();
original.Add(1);
original.Add(2);

List<int32> copy = new List<int32>(original);
original.Add(3);

Posted 7-Aug-13 3:29am

Manas Bhardwaj

Updated 7-Aug-13 3:35am

v2

Comments

Hamed_z 7-Aug-13 9:43am

what about if elements of my list are reference types ?

Manas Bhardwaj 7-Aug-13 9:56am

shouldn't be any different? Or I am missing anything?

List<List<string>> original = new List<List<string>>();
original.Add(new List<string>{"Manas", "bhardwaj"});
original.Add(new List<string>{"Manas1", "bhardwaj2"});

List<List<string>> copy = new List<List<string>>(original);
original.Add(new List<string>{"Manas3", "bhardwaj3"});