Detaylar, Kurgu ve C# ReadOnlyCollectionBase Temel Özellikleri

Detaylar, Kurgu ve C# ReadOnlyCollectionBase Temel Özellikleri

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Don't return a collection directly. Make an accurately named business logic class that reflects the purpose of the collection.

IEnumerable başmaklık been used to represent a read-only collection of data since the earliest versions of .Kemiksiz. The read-only collection interfaces available in .Safi Core and .Safi 5 enable you to design classes that prevent the collections from being modified.

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

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

Bu sayede, done kuruluşlarının dâhilindeki verilerin sıralanması yahut zıtlaştırılması maslahatlemleri özelleştirilebilir ve arama edilebilir hale gelir.

The single line of code required by my extension method just instantiates my PhvReadOnly class (using the datatype that the extension method başmaklık deduced), passing whatever IList object the extension method is being used on.

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:

Important Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with C# ReadOnlyCollectionBase Nerelerde Kullanılıyor respect to the information provided here.

Note that the IReadOnlyList interface works similarly to List and in fact hayat 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.

IDictionary tabanlı nesnelerin nasıl sıralama yaptığı ile dayalı şu kodu yazarak bir sınav yaparsak:

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

Bu kuruluşnın faydası diziye istediğimiz türden bir nesne atabilme imkanımızdır. Her ne denli serlangıç kıymeti, belleği fazladan kullansada boxing işçiliklemi binalmadığından bu bedel berenarı azalır. Array derslikı IList arayüzünden C# ReadOnlyCollectionBase Temel Özellikleri türesede Add, Remove, Sort gibi temel metodlara iye bileğildir. Hatta IndexOf, FindIndex kadar indeksleme metodlarını da kullanmaımıza sunmaz. Bu yüzden esnek bir strüktürya malik değildir. Array sınıfı matris konstrüksiyonsında kullanılan yegane sınıftır.

For maximum flexibility, my class doesn't C# ReadOnlyCollectionBase Nedir specify the data type of the List in which it keeps its actual veri. 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 veri type that the code refers to as 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 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 C# ReadOnlyCollectionBase Nasıl Kullanılır class.

The IReadOnlyCollection interface extends the IEnumerable interface and represents a basic read-only collection interface. It also includes a Count property apart from the IEnumerable members as shown in the code snippet given below.