What is IReadOnlyCollection?
The IReadOnlyCollection interface extends the IEnumerable interface and represents a basic read-only collection interface. It also includes a Count property apart from the IEnumerable members as shown in the code snippet given below.
What is IReadOnlyList?
The IReadOnlyList represents a list in which the number and order of list elements is read-only. The content of list elements is not guaranteed to be read-only.
How do I make a HashSet read-only?
Consider exposing the property as the type IReadOnlyCollection<> instead, which will provide a read-only view of the HashSet<> . This is an efficient way of implementing this, since the property getter will not require a copy of the underlying collection.
Is IEnumerable immutable?
If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 10 years ago. Just realized IEnumerable is immutable, what are other commonly used immutable generic interfaces?
Which one is read-only collection?
A collection that is read-only is simply a collection with a wrapper that prevents modifying the collection; therefore, if changes are made to the underlying collection, the read-only collection reflects those changes.
Is IEnumerable readonly?
8 Answers. In fact, IEnumerable is already readonly. It means you cannot replace any items in the underlying collection with different items. That is, you cannot alter the references to the Person objects that are held in the collection.
What is Immutablelist C#?
c# .net immutable-collections. .NET 4.5 has a new namespace System.Collections.Immutable. This package provides collections that are thread safe and guaranteed to never change their contents, also known as immutable collections.
What is ReadOnlyCollection C#?
ReadOnlyCollection makes an array or List read-only. With this type from System. Collections. ObjectModel, we provide a collection of elements that cannot be changed.
Why HashSet is faster than List?
The result clearly shows that the HashSet provides faster lookup for the element than the List. This is because of no duplicate data in the HashSet. The HashSet maintains the Hash for each item in it and arranges these in separate buckets containing hash for each character of item stored in HashSet.
When should you use IEnumerable?
IEnumerable is best to query data from in-memory collections like List, Array etc. IEnumerable doesn’t support add or remove items from the list. Using IEnumerable we can find out the no of elements in the collection after iterating the collection. IEnumerable supports deferred execution.
How is the ireadonlycollection defined in.net 4?
The IReadOnlyCollection interface, which forms the base of the IReadOnlyList and IReadOnlyDictionary classes, is defined as IReadOnlyCollection . The out modifier was added in .NET 4 to denote covariance, whereas the in modifier marks a type as being contravariant. A contravariant type may be substituted by one of its base classes.
Which is the base of the ireadonlycollection interface?
The IReadOnlyCollection interface, which forms the base of the IReadOnlyList and IReadOnlyDictionary classes, is defined as IReadOnlyCollection .
Which is an instance of the readonlycollection?
Finally, the code example creates an array larger than the collection and uses the CopyTo method to insert the elements of the collection into the middle of the array. An instance of the ReadOnlyCollection generic class is always read-only.
What is the use of read only collections?
As you can see, there are many uses for the new read-only collection interfaces. Primarily, they can be used to clean up your application’s API to indicate that a method or class should not modify the contents of a collection that it is accessing.