You've probably identified what pattern the PhvReadOnlyList implements: it's a wrapper. In the .Kemiksiz Framework 4.0 or earlier, the wrapper class that you'd really use to create a read-only list would be the .NET ReadOnlyCollectionBase class. Kakım with my example, you use the ReadOnlyCollectionBase class to create your own class with whatever functionality you need -- but you don't need to write the GetEnumerator method or create your own UnderlyingList because the ReadOnlyCollectionBase handles both.
Tip You kişi loop over the ReadOnlyCollection using the foreach-loop. A for-loop is also possible with the Count property and indexer.
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Sum(IEnumerable, Func) Computes the sum of the sequence of Single values that are obtained by invoking a transform function on each element of the input sequence.
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Average(IEnumerable, Func) Computes the average of a sequence of Int32 values that are obtained by invoking a C# ReadOnlyCollectionBase Nedir transform function on each element of the input sequence.
If you're tolerant of some "noise" in your own encapsulated code then I would suggest wrapping a T[] array and exposing an IList which happens to be a ReadOnlyCollection:
dip hamiş: BitArray ve LinkedList sınıflarının tasarruf amacı farklı başüstüneğundan teste bağımlı tutmaya lüzumlu görmedim.
Dan TaoDan Tao C# ReadOnlyCollectionBase Nedir 128k5656 gold badges308308 silver badges448448 bronze badges 4 I'd like to avoid noise in both callee and caller. Exposing a ReadOnlyCollection as anything other than itself isn't C# ReadOnlyCollectionBase Nasıl Kullanılır necessary: after all, exposing it kakım an IList just gets confusing (where'd I get this IList from C# ReadOnlyCollectionBase Nerelerde Kullanılıyor - dirilik I modify it?), and any IList is exposable as ReadOnlyCollection so there's no loss of generality.
Figure 1 below displays the members of List. Note that you have a method named Add, so you kişi easily add authors to the list of authors we’ve created in the preceding code snippet.
C# metotları, kodun elan düzenleme olmasını esenlar, daha kısaltarak ve elan C# ReadOnlyCollectionBase Nasıl Kullanılır okunabilir bir şekilde makaslamaklmasına yardımcı olur ve projenize henüz okkalı kârlevsellik kazandırır.
Here’s where you kişi 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 kişi make our collection read-only.
1 Also, in the provided case, the best center of knowledge on whether the invoice güç be paid is the invoice itself, so it must have a property CanBePaid - so, a bit of cleverness eliminates the need to change "in 4 places"
This causes unnecessary boxing/unboxing of value types. One of the benefits of using generics is the avoidance of such boxing/unboxing which could have a detremintal effect on the performance of the collections.