The collection used here is clearly mutable in nature. So how do you prevent this veri from being changed?

Simply put, Microsoft defined a ReadOnlyCollectionBase, yet did derece use it bey the base class for ReadOnlyCollection when it clearly sounds that this should have been the way.

Dirilik you arrange 25 whole numbers (hamiş necessarily all different) so that the sum of any three successive terms is even but the sum of all 25 is odd?

If you (Class A) continue to modify the underlying collection after you hand it out bey a ReadOnlyCollection then class B will see these changes, have any iterators invalidated, etc. and generally be open to any of the usual concurrency issues with collections.

Now when you use IntelliSense to inspect IReadOnlyList, you’ll no longer see Add among the supported methods. Figure 2 below displays the members of the IReadOnlyList instance.

Average(IEnumerable, Func) Computes the average of a sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Matthew WatsonMatthew Watson 108k1111 gold badges170170 silver badges290290 bronze badges 2 2 To avoid that a client gets a writable object by downcasting, WritableMyItem (and IWritableMyItem if used) could be made private or internal.

Sam Allen is passionate about computer languages. In the C# ReadOnlyCollectionBase Nedir past, his work özgü been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.

Exposing the array directly to those using it means that they güç modify it - this is a violation of encapsulation and veri hiding.

Sometimes you may want to use an interface, perhaps because you want to mock the collection during unit testing. Please see my blog entry for C# ReadOnlyCollectionBase Nasıl Kullanılır adding your own interface to ReadonlyCollection by using an adapter.

However, if you want to access the elements of the IEnumerable collection by index or you want to retrieve the number of C# ReadOnlyCollectionBase Temel Özellikleri elements in the collection, you should use IReadOnlyList as shown below.

However, a read-only collection doesn't C# ReadOnlyCollectionBase Nedir provide Add and Remove methods for changing which C# ReadOnlyCollectionBase Nerelerde Kullanılıyor items are in the collection, though the items themselves may be updateable (it's the responsibility of the items in the collection to protect themselves from changes).

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In the class that exposes a read-only property based on PhvReadOnlyList, you still need an ordinary List, with its Add and Remove methods, so that your class emanet put items in the List both before and after creating a PhvReadOnlyList from it.