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In C#, the difference between _event.AsReadOnly() and [..._event] involves how each creates a view of the original collection.
_event.AsReadOnly():
This method is called on a List and returns a read-only wrapper for the list. The underlying data remains the same, but the wrapper prevents modification of the list (e.g., adding, removing, or changing elements) through the read-only view.
Changes to the original list still reflect in the read-only view, but any attempts to modify the list through the AsReadOnly() wrapper will throw a runtime exception.
It’s efficient because it doesn't copy the data, but only wraps the original list.
Example:
List _event = new List { 1, 2, 3 };
var readOnlyEvent = _event.AsReadOnly();
[..._event]:
If you're referring to creating a shallow copy of the list (like in some other languages, e.g., JavaScript), the C# equivalent would be new List(_event).
- Creating a new list like new List(_event) would make a copy of the original list. The new list is independent of the original one, so changes made to one list don't affect the other.
- This operation involves copying the entire list, which can have a performance impact depending on the size of the list.
Example:
List _event = new List { 1, 2, 3 };
List copiedEvent = new List(_event);
Is there a difference between using _events.AsReadOnly() and [.. _events]?
If yes why not use the first one?
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