ToList() - does it create a new list?
c#, linq
Solution
Yes, `ToList` will create a new list, but because in this case `MyObject` is a reference type then the new list will contain references to the same objects as the original list.
Updating the `SimpleInt` property of an object referenced in the new list will also affect the equivalent object in the original list.
(If `MyObject` was declared as a `struct` rather than a `class` then the new list would contain copies of the elements in the original list, and updating a property of an element in the new list would not affect the equivalent element in the original list.)
Problem
Let's say I have a class ``` public class MyObject { public int SimpleInt { get; set; } } ``` And I have a `List<MyObject>`, and I `ToList()` it and then change one of the `SimpleInt`, will my change be propagated back to the original list. In other words, what would be the output of the following method and why? ``` public void RunChangeList() { var objs = new List<MyObject>(){ new MyObject() { SimpleInt = 0 } }; var whatInt = ChangeToList(objs); } public int ChangeToList(List<MyObject> objects) { var objectList = objects.ToList(); objectList[0].SimpleInt = 5; return objects[0].SimpleInt; } ```