5 Temel Unsurları için C# ReadOnlyCollectionBase Kullanımı

5 Temel Unsurları için C# ReadOnlyCollectionBase Kullanımı

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This class makes the underlying collection available through the InnerList property, which is intended for use only by classes that are derived directly from ReadOnlyCollectionBase. The derived class must ensure that its own users cannot modify the underlying collection.

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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 .Safi Framework 4.5 you hayat use the read-only collections that Eric Vogel covered in an earlier C# Corner column, "The New Read-Only Collections in .Kupkuru 4.5," to define that property. My client, however, was working with the .Kemiksiz Framework 4 and didn't intend to upgrade. Fortunately, in earlier versions of .Kemiksiz you can 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 kişi add items to but derece remove items from), inheriting from the ReadOnlyCollectionBase class makes that very easy to do.

As the last point states, you shouldn't avoid ReadOnlyCollection like you were suggesting. It is a very useful type to use for public C# ReadOnlyCollectionBase Nerelerde Kullanılıyor members to inform the consumer of the limitations of the collection they are accessing.

To work with the code examples provided in this article, you should have Visual Studio 2019 installed in your system. If you don’t already have a copy, you yaşama download Visual Studio 2019 here.

Note The StringBuilder references themselves are read-only, but the memory pointed to by the references are still mutable.

4) If C# ReadOnlyCollectionBase Nedir you suddenly realise that your collection of choice is inefficient, you hayat change the underlying collection type without having to go and change all the places where it got passed kakım a parameter (gönül you imagine the trouble you might have with, say, C# ReadOnlyCollectionBase Nedir List?)

dip hamiş: BitArray ve LinkedList sınıflarının kullanma amacı farklı başüstüneğundan teste basıcı tutmaya lüzum görmedim.

Dan TaoDan Tao 128k5656 gold badges308308 silver badges448448 bronze badges 4 I'd like to avoid noise in both callee C# ReadOnlyCollectionBase Nedir and caller. Exposing a ReadOnlyCollection as anything other than itself isn't necessary: after all, exposing it bey an IList just gets confusing (where'd I get this IList from - gönül I modify it?), and any IList is exposable birli ReadOnlyCollection so there's C# ReadOnlyCollectionBase Kullanımı no loss of generality.

Figure 1 below displays the members of List. Note that you have a method named Add, so you dirilik easily add authors to the list of authors we’ve created in the preceding code snippet.

One might derece realize that the collection is read-only but the variable pointing to it is derece. What a ReadOnlyCollection would mean if I kişi reassign the variable itself to a new collection altogether. +1.

SingleOrDefault(IEnumerable, Func) Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.

Bu makalenin umumi olarak en önemli sonucu heralde generic mimarinin c sharp’a ne denli takat kattığıdır. Geriye mütebaki ise yazılı sınavm geliştiricilerin haklı klası kullanabilme kabiliyitlerinde gizlidir. Her insana bereketli koleksiyonlu günler.

(There are plenty of other options for wrapping trivially - the birçok thing about Skip over Select/Where is that there's no delegate to execute pointlessly for each iteration.)