5 Basit Teknikleri için C# ReadOnlyCollectionBase Nerelerde Kullanılıyor

5 Basit Teknikleri için C# ReadOnlyCollectionBase Nerelerde Kullanılıyor

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This doesn't create a copy of list. ReadOnlyCollection doesn't copy the veri, it works directly on the supplied list. See documentation:

A note. Read-only status is derece transferred to other references. You cannot replace the references with other StringBuilder references or the null literal.

That method must return an Enumerator object, which provides the actual support for the looping through the collection. Similarly, code that retrieves an item by the item's position in the collection also looks for the IEnumerable interface and uses the GetEnumerator method. What the Enumerator object doesn't support are the Add or Remove methods. Ignoring the ReadOnlyCollectionBase

SingleOrDefault(IEnumerable) Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.

Passing IList/IDictionaries is generally no good because I can't communicate nor enforce the read-only nature of those views (so e.g. IList is actively worse than an array here)

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

Hangi sınıf nerde kullanılmalı, bu sınıfların değişiklıkları neler, performansları nasıl kadar bazı soruları bu makalede omuz omuza arayalım.

Average(IEnumerable, Func) Computes the average of a sequence of nullable Int32 values that are obtained by C# ReadOnlyCollectionBase Nedir invoking a transform function on each element of the input sequence.

However, it should be noted that while these read-only collection types provide a read-only view of the C# ReadOnlyCollectionBase Kullanımı data, they are only wrappers. They do derece provide an immutable copy of the collection.

In Visual Basic, an extension method must be declared inside a Module and decorated with the Extension attribute. Its first parameter specifies the kind of object to which it will attach itself. I want my extension method to appear in the IntelliSense dropdown lists for any class that implements the IList interface, so I'll declare the C# ReadOnlyCollectionBase Nerelerde Kullanılıyor method's first (and only) parameter kakım IList(of T) -- the compiler will figure out the type that T represents based on the List passed to my method.

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

Inheriting from a non-generic base class would be ineffecient. If the type was using a non-generic base, all it would be would be a thin layer above the base collection, where the generic features would simply derive from casting from the underlying object instances of the base collection.

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 C# ReadOnlyCollectionBase Nasıl Kullanılır interface that I believe is ülkü for precisely this purpose. See my updated answer for a bit more info.

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