C# ReadOnlyCollectionBase Nasıl Kullanılır Seçenekler

C# ReadOnlyCollectionBase Nasıl Kullanılır Seçenekler

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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 .Kupkuru ReadOnlyCollectionBase class. As 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.

In programs, an immutable collection sevimli be used with less copying—we do not need to worry about it being modified. This birey make programs simpler and easier to reason about.

I was thinking about creating a new class derived from ReadOnlyCollection (class ReadOnlyMyCollection : ReadOnlyCollection or class ReadOnlyMyCollection : ReadOnlyCollection) which returns the read-only wrapper class (ReadOnlyMyItem) through the square brackets operator, but either the square brackets operator is derece marked kakım virtual and the return type is hamiş even the same or the constructor doesn't have an IList of the wrapper class (IList) to use. Should I build the class (ReadOnlyMyCollection) from scratch?

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.

I currently have return veri; wrapped by a ReaderWriterLockSlim to protect the collection from sharing violations.

As per the comments below, you sevimli prevent the possibility of downcasting by making IWriteableMyItem and WriteableMyItem private or C# ReadOnlyCollectionBase Kullanımı internal. However note that this could still be C# ReadOnlyCollectionBase Nedir circumvented via reflection - but we are protecting against accidents rather than fraud.

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:

In my example I exposed it all, but you don't have to do this. You dirilik make it read-only if you want, or validate additions to the list, prior to adding them.

Note that the IReadOnlyList interface works similarly to List and in fact yaşama be used in place of List when you want the elements of the list to be read-only. We will illustrate this with an example in the next section.

Movie about a planet where seeds must be harvested just right in order to liberate a valuable crystal within

C# IStructuralEquatable, özellikle çeşitli bilgi dokumalarının veya koleksiyonların dâhilğinin strüktürel olarak mukabillaştırılması gereken durumlarda kullanılır. Bu durumlar ortada:

Bu kuruluşnın faydası diziye istediğimiz türden bir nesne atabilme olanakımızdır. Her ne denli temellangıç kıymeti, belleği fazladan kullansada boxing hizmetlemi strüktürlmadığından bu C# ReadOnlyCollectionBase Kullanımı boy bos berenarı azalır. Array sınıfı IList arayüzünden türesede Add, Remove, Sort gibi temel metodlara mevla bileğildir. Hassaten IndexOf, FindIndex kabilinden indeksleme metodlarını da kullanmaımıza sunmaz. Bu yüzden esnek bir dokumaya ehil değildir. Array derslikı matris konstrüksiyonsında kullanılan yegane sınıftır.

End Sub And that's all you need to write. The class that's using your new read-only collection would be identical C# ReadOnlyCollectionBase Nedir to the class that used my custom PhvReadOnlyList. In fact, if that's all you want, then you don't even need to create your own version of the ReadOnlyCollectionBase class C# ReadOnlyCollectionBase Temel Özellikleri -- the .

So, you yaşama define your collection as a private field and expose it birli a public readonly property like below birli _parents