Temel İlkeleri C# ReadOnlyCollectionBase Nasıl Kullanılır

Temel İlkeleri 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.

An instance of the ReadOnlyCollection generic class is always read-only. A collection that is read-only is simply a collection with a wrapper that prevents modifying the collection; therefore, if changes are made to the underlying collection, the read-only collection reflects those changes. See Collection for a modifiable version of this class.

1 Birli long birli WritableMyItem is made private, birli @KlausGütter suggested, this solution seems to work great. The other sıkıntı I thought I would face is if the IReadOnlyList is casted into a IList, but since IList's type parameter is derece covariant, I don't think this is possible. Thank you!

Bir metodu güncellemek yahut takas etmek istediğinizde, salt metodu değhizmettirmeniz yerinde olacaktır. öteki şifre alanlarına dokunmanıza lüzum kalmaz, bu da hataları önlemenizi ve projenizi elan hızlı ve kredili bir şekilde güncellemenizi sağlar.

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

Note also that this makes your sorun particularly nice. If you don't want people changing the collections, your container need contain no mutators. If you decide later that in just one case you actually HAVE to modify it, you güç create a safe mechanism to do so.

instead. I just included IWritableMyItem for completeness (because it shows how you introduce a seki to an interface property that only saf a get, by using new).

C# IStructuralEquatable arabirimini uygulayıcı bir özel derme klası oluşturarak, nasıl yapısal denklik muayeneü konstrüksiyonlacağını anlamak C# ReadOnlyCollectionBase Temel Özellikleri önemlidir. Süflidaki örnek, bu mevzuyu elan yerinde anlamanıza yardımcı olacaktır:

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C# IStructuralEquatable, özellikle çeşitli veri mimarilarının veya koleksiyonların derunğinin strüktürel olarak muhaliflaştırılması gereken durumlarda kullanılır. Bu durumlar arasında:

Enumerating through a collection is intrinsically hamiş a thread-safe procedure. Even when a collection is synchronized, other threads dirilik still modify the collection, which causes C# ReadOnlyCollectionBase Nedir the enumerator to throw an exception.

For maximum flexibility, my class doesn't specify the veri type of the List in which it keeps its actual data. Instead, I declare my UnderlyingList variable to use any class that implements the IList interface. C# ReadOnlyCollectionBase Temel Özellikleri I've also made this a generic class: Rather than specify what kind of List I'm working with, I've forced my class to be instantiated with a data type that the code refers to birli T. Wherever in my code I C# ReadOnlyCollectionBase Nasıl Kullanılır need to specify my List's data type, I just use the T reference. Finally, I've chosen to have this class C# ReadOnlyCollectionBase Temel Özellikleri implement the generic version of IEnumerable, which requires two versions of the GetEnumerator method -- but the code is identical in both versions of the method. Listing 1. The basics of the PhvReadOnlyList class.

DefaultIfEmpty(IEnumerable, TSource) Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.