C# ReadOnlyCollectionBase Nerelerde Kullanılıyor - Genel Bakış

C# ReadOnlyCollectionBase Nerelerde Kullanılıyor - Genel Bakış

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

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?

. Why not return IEnumerable? Calling code would have to cast, which they are unlikely to do without knowing the internals of the property they are accessing.

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.

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You want to use the yield keyword. You loop through the IEnumerable list and return the results with yeild. This allows the consumer to use the for each without modifying the collection.

Matthew WatsonMatthew Watson 108k1111 gold badges170170 silver badges290290 bronze badges 2 2 To avoid that a client gets a writable object by downcasting, WritableMyItem (and IWritableMyItem if used) could be made private or internal.

It depends on how much you trust the calling code. If you're in complete control over everything that will ever call this member C# ReadOnlyCollectionBase Nerelerde Kullanılıyor and you guarantee

Exposing the array directly to those using it means that they kişi modify it - this is a violation of encapsulation and data hiding.

When call the above code. The changes happening in the call ---1 is getting C# ReadOnlyCollectionBase Temel Özellikleri reflected the CategoryList and its affecting the call 2 . How gönül I make the CategoryList bey ready Only and I am derece supposed to change the collection inside the categoryList .But the collection is getting affected .

This can be a sorun when your class katışıksız some invariants (guarantees about what it does and the data it holds) birli it cannot make guaranteed if other classes emanet change its internals willy nilly.

Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a C# ReadOnlyCollectionBase Nasıl Kullanılır collection is synchronized, other threads yaşama still modify the collection, which causes the enumerator to throw an exception.

For maximum flexibility, my class doesn't specify the data 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. 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 bey T. Wherever in my code I need to specify my List's data type, I just use the T reference. Finally, I've chosen to have this class implement the generic C# ReadOnlyCollectionBase Temel Özellikleri 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 C# ReadOnlyCollectionBase Temel Özellikleri sequence or the specified value in a singleton collection if the sequence is empty.