Greatest Kılavuzu C# IEnumerable Nerelerde Kullanılıyor için

Greatest Kılavuzu C# IEnumerable Nerelerde Kullanılıyor için

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GitHub'da bizimle ortaklaşa iş gestaltn Bu gönülğin kaynağı GitHub'da bulunabilir; burada üste sorunları ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Henüz aşkın veri bâtınin ulamada kâin kılavuzumuzu inceleyin.

Bu dü arayüzün kullanma senaryoları değişikdır ve birbirlerinin alegori kullanılmamalıdır. Bu makalede, IEnumerable ve IQueryable arasındaki farkları inceleyeceğiz.

Now the thing to note is that IEnumerable brought all the 5 records present in Salary table and then performed an in-memory filteration on the client side to get bütünüyle 2 records. So more veri (3 additional records in this case) got transferred over the network and ate up the bandwidth unnecessarily.

IEqualityComparer kullanarak, özel gereksinimlere makul done el işi stratejileri vüruttirebilir ve yürütüm genelinde tutarlılık sağlayabilirsiniz.

I have writen about custom IEnumerator. Whats the simplest way to make IEnumerable from it ? ülküsel solution (one line of code) would be if there was some class for that purpose. Or do I have to create my own ?

What I do is make a class that implements both IEnumerator and IEnumerable. Make GetEnumerator() return itself and you kişi iterate it like olağan.

While it might seem that only array types kişi make use of this construct, the truth of the matter is

IEnumerable and IEnumerator are both interfaces. IEnumerable katışıksız just one method called GetEnumerator. This method returns (birli all methods return something including void) another type which is an interface and that interface is IEnumerator. When you implement enumerator logic in any of your collection class, you implement IEnumerable (either generic or C# IEnumerable Kullanımı non generic).

"These methods that extend IQueryable(Of T) do derece perform any querying directly. Instead, their functionality is to build an Expression object, which is an expression tree that represents the cumulative query. "'

Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze badges 1 1 The mistake with "Reset" was with just having one type of enumerable. IMHO, there should have been an IMultipassEnumerable, inheriting IEnumerable, which would support Reset and guarantee that multiple passes C# IEnumerable Nedir will either return identical veri or throw an exception; an ordinary IEnumerable whose collection was modified should be allowed to return 'sensible' data if it's able to do so C# IEnumerable Temel Özellikleri or throw an exception if it birey't, and an C# IEnumerable Kullanımı ISafeEnumerable, which would be expected to work sensibly (without throwing an exception) even if a collection changes. A bit C# IEnumerable Nasıl Kullanılır late now to change things, though.

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But if your class cannot act like a collection then provide a public IEnumerable property for its elements:

If you create an IEnumerable, then all rows will be pulled into memory bey objects before running the query.

When declaring a method’s parameter types, you should specify the weakest type possible, preferring interfaces over base classes. For example, if you are writing a method that manipulates a collection of items, it would be best to declare the method’s parameter by using an interface such as IEnumerable rather than using a strong veri type such bey List or even a stronger interface type such as ICollection or IList: