Memory Allocation if a list added to list

Question

1.00/5 (1 vote)

See more:

Hi Folks,

Below code snippet is adding a list to anothe list.

List

XML

<string> str1 = new List<string> { "A",   "A", "B", "C", "D", "A", "B", "C", "D", };
            List<string> str2 = new List<string> { "A", "A", "B", "C"};

            str1.AddRange(str2);

I am curios to know how the memory allocation will happen in this case.

1) Will str1 contains 11 element and 11th element will be pointing to str2
Or
Str1 will contain 15 element.

Posted 23-Jun-14 2:53am

vickyanand25005

Add a Solution

Comments

_Asif_ 23-Jun-14 8:57am

Can't you see yourself by opening watch window and see the allocations?

2 solutions

Solution 1

No, str1 will contain 13 elements:

A
A
B
C
D
A
B
C
D
A
A
B
C

There were 9 before, and you added 4: 9 + 4 == 13

Posted 23-Jun-14 3:10am

OriginalGriff

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)

Paulo Zemek · Accepted Answer · 2014-06-23T03:29:00

The AddRange method copies all the items found in another enumerable. The original list named str2 can be changed and even be collected and it will not affect the contents of str1 after the call to AddRange.

In fact, the AddRange is very similar to:

C#

foreach(var value in str2)
  str1.Add(value);

But even if it is very similar, it is actually faster in many situations as it can do a single validation/inner array resize for all the items that will be added while the Add will do those validations per call.