Is AsReadOnly required?

Code (CSharp):

1. public IReadOnlyList<int> GetChildDir() {
2.         return childDir;
3.         //return childDir.AsReadOnly();
4.     }

What is the difference from return and commented return

 

If childDir is already a read-only collection, no difference.

If it is NOT a read-only collection, and this is the method you're accessing:

https://docs.microsoft.com/en-us/do...neric.list-1.asreadonly?view=netframework-4.8

Then the docs say that it returns a read only collection, which happily implements the IReadOnlyList interface, which is what your GetChildDir() function returns.

 

Um sorry if i didnt clarify. Function always returns read only list. List childDir is List<int>. I want to return it as read only but my question is what is difference between returning just list iwthout .AsReadOnly(). since in both i cant access functions like add and remove