Satın Almadan Önce C# IEnumerable Nerelerde Kullanılıyor Things To Know

Satın Almadan Önce C# IEnumerable Nerelerde Kullanılıyor Things To Know

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, and the database only returns the rows that are relevant. But if we had returned a List from AllSpotted(), then it may run slower because the database could return far more data than is actually needed, and we waste cycles doing the filtering in the client.

Anything in .NET that you can iterate over implements IEnumerable. If you're building your own class, and it doesn't already inherit from a class that implements IEnumerable, you kişi make your class usable in foreach statements by implementing IEnumerable (and by creating an enumerator class that its new GetEnumerator method will return).

Genel sıfır bir derme üzerinde olağan bir yinelemeyi destekleyen bir numaralandırıcıyı kullanıma sunar.

Muhtelit fonksiyonlarının özelleştirilmesi ve muta örgülarında performansı tezyit etmek bâtınin GetHashCode yöntemi kullanılır.

In C# 4 and earlier the object obj; is declared outside of the while loop, this changes the behavior of the loop when working with things that capture variables like anonymous functions.

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// but this throws an exception, because the pointer or link to the // database namely the DbContext called MyEntities no longer exists.

C# IEnumerator kullanarak MySQL veritabanından veri çgrup bu verileri DataGridView yoklamaüne nasıl ekleyebileceğimizi gösteren örnek harf adida arz almaktadır.

So you have a common IEnumerator-implementing class for all ten, and each collection just has to implement IEnumerable using that enumerating class. It's about separation of concerns, treating holding veri and enumerating veri as separate operations.

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 will either return identical data or throw an exception; an ordinary IEnumerable whose collection was C# IEnumerable Nerelerde Kullanılıyor modified should be allowed to return 'sensible' veri if it's able to do so or throw an exception if it birey't, and an ISafeEnumerable, which would be expected to work sensibly (without throwing an exception) even if a collection changes. A bit late now to change things, though.

" This is false, because the where clause is getting called on an IEnumerable and that only knows how to loop through objects which are already coming from the database. If you made the return of AllSpotted() and the parameters of Feline() and Canine() into IQueryable, then the filter would C# IEnumerable Kullanımı happen in SQL and this answer would make sense.

IEnumerable is an interface that tells us that we can enumerate over a sequence of T instances. If you need to allow somebody to see and perform some action for each C# IEnumerable Temel Özellikleri object in a collection, this is adequate.

RastoRasto 17.6k4848 gold badges161161 silver badges253253 bronze badges 5 1 Unfortunately you have to C# IEnumerable Kullanımı make your own. The most conservative approach would be for you to cache all the items inside your new C# IEnumerable Temel Özellikleri enumerable, to handle enumerators that sevimli only be enumerated once, so there is no general class for this in the runtime.

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