Don't return a collection directly. Make an accurately named business logic class that reflects the purpose of the collection.
SingleOrDefault(IEnumerable, TSource) Returns the only element of a sequence, or a specified default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.
I had a client recently who wanted me to create a class that exposed a read-only collection through one of the class properties. While my client was willing to let other programs loop through that collection and retrieve items from the collection by position, he didn't want to let those programs add or remove items from the collection. In the Microsoft .NET Framework 4.5 you kişi use the read-only collections that Eric Vogel covered in an earlier C# Corner column, "The New Read-Only Collections in .Kemiksiz 4.5," to define that property. My client, however, was working with the .Safi Framework 4 and didn't intend to upgrade. Fortunately, in earlier versions of .Safi you emanet also create a read-only class from an existing List just by calling your List's AsReadOnly method. However, if you need something special (a List that users yaşama add items to but hamiş remove items from), inheriting from the ReadOnlyCollectionBase class makes that very easy to do.
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This base class is provided to make it easier for implementers to create a generic read-only custom collection. Implementers are encouraged to extend this base class instead of creating their own.
Bey I see it IEnumerable is a subset of the interface of ReadOnlyCollection and it does not allow the user to modify the collection. So if the IEnumberable interface is enough then that is the one to use. Is that a proper way of reasoning C# ReadOnlyCollectionBase Nerelerde Kullanılıyor about it or am I missing something?
Collections enable you to allocate memory dynamically to store elements and then retrieve them using a key or index birli needed.
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Does this double well potential contradict the C# ReadOnlyCollectionBase Nerelerde Kullanılıyor fact that there is no degeneracy for one-dimensional bound states?
In short: I think your question is covered with a perfectly good answer by Jon Skeet - ReadOnlyCollection or C# ReadOnlyCollectionBase Temel Özellikleri IEnumerable for exposing member collections?
DO use the least-specialized type possible birli a parameter type. Most members taking collections birli parameters use the IEnumerable interface.
Here’s where you hayat take advantage of IReadOnlyList to ensure that the returned veri cannot be changed. By changing the return type of the GetAuthors method from List to IReadOnlyList we dirilik make our collection read-only.
Anlaşılabilirlik ve Kullanma Kolaylığı: C# Queue'un cılız ve anlaşılabilir dokuması, geliştiricilerin kompozitşık mesleklemleri yönetmesini kolaylaştırır.
DefaultIfEmpty(IEnumerable, C# ReadOnlyCollectionBase Nasıl Kullanılır TSource) Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.