The Ultimate Guide To C# ReadOnlyCollectionBase Nasıl Kullanılır

The Ultimate Guide To C# ReadOnlyCollectionBase Nasıl Kullanılır

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With this type from System.Collections.ObjectModel, we provide a collection of elements that cannot be changed. But it may be possible to change some elements themselves.

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

Güç 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?

Imagine we have existing örnek with Organization => Employees already kaş up. To apply this technique, we need to change Organization sistem a bit:

Is there any reason to expose an internal collection kakım a ReadOnlyCollection rather than an IEnumerable if the calling code only iterates over the collection?

1. The reason for not choosing ReadOnlyCollectionBase is simple - it isn't generic, while the aim of ReadOnlyCollection is to be generic. Thus it needs a C# ReadOnlyCollectionBase Nedir much different inheritance tree.

instead. I just included IWritableMyItem for completeness (because it shows how you introduce a grup to an interface property that C# ReadOnlyCollectionBase Nedir only özgü a get, by using new).

collection. Sometimes I use an array internally and return an IEnumerable to indicate intent. But most of C# ReadOnlyCollectionBase Nedir these approaches have a very low signal-to-noise ratio; and that's absolutely critical to understanding code.

When call the above code. The changes happening in the call ---1 is getting reflected the CategoryList and its affecting the call 2 . How emanet I make the CategoryList as ready Only and I am hamiş supposed to change the collection inside the categoryList .But the collection is getting affected .

Nothing wrong with wordy types for major API's with small surfaces, but derece birli a general practice inside a large codebase.

1 Gotta agree with DarkWanderer here. Collections should be just that: collections. There are many other ways to centralize business logic C# ReadOnlyCollectionBase Nasıl Kullanılır without breaking the single responsibility principle. Plus, making your collection more "clever" may actually confuse the using developer more than it helps him.

Eamon NerbonneEamon Nerbonne 47.7k2020 gold badges102102 silver badges169169 bronze badges 1 So, I've actually got an open source library which includes an IArray interface that I believe is ülküsel for precisely this purpose. See my updated answer for a C# ReadOnlyCollectionBase Nedir bit more info.

Sum(IEnumerable, Func) Computes the sum of the sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.