Açıklanan C# IEnumerable Temel Özellikleri Hakkında 5 Kolay Gerçekler
Açıklanan C# IEnumerable Temel Özellikleri Hakkında 5 Kolay Gerçekler
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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 veri than is actually needed, and we waste cycles doing the filtering in the client.
Doğrusu daha çok custom bir enumerator sınıfı yazmamıza lazım yasak yield keyword'ü ile compiler bunu art planda bizim yürekin konstrüksiyonyor.
As per other answers, the evaluation of the result was deferred until calling ToList or similar invocation methods for example ToArray.
Peki. Şu anne kadar hiç IEnumerable ve IEnumerator interfacelerini kullanmadım diyebiliriz. Hadi elkızı şimdi bu interfaceleri hiç yek ele alalım ve bu sırada fevkdaki satırlarda bahsettiğimiz GetEnumerator metodunuda tam teferruatlı masaya yatıralım.
This will create a new list element for each element in memory, enumerating the IEnumerable and is thus less performant if you only enumerate once - but safer and sometimes the List methods are handy (for instance in random access).
The syntax (which you rarely see because there are prettier ways to do it) for moving through a collection that implements IEnumerable is:
Ryan LundyRyan Lundy 208k4141 gold badges183183 silver badges214214 bronze badges 3 4 Then why do we need this IEnumerable abstraction, if the only thing it does is just provide an access to Enumerator? Why don't just use Enumerator instead
IEnumerable gives you the way to implement your own logic of storing and iterating over object collection
IEnumerable describes behavior, while List is an implementation of that C# IEnumerable Nasıl Kullanılır behavior. When you use IEnumerable, you give the compiler a chance to defer work until later, possibly optimizing along the way. If you use ToList() you force the compiler to reify the results right away.
Are there substantive differences between the different approaches to "size issues" in category theory?
And that might be useful and more efficient in certain cases. For example, C# IEnumerable Nasıl Kullanılır your class might hamiş hold any collection in memory, but rather iterate over all files existing in a certain directory, or items in certain DB, or C# IEnumerable Nedir other unmanaged resources. IEnumerable hayat step in and do it for you (you could also do it without IEnumerable, but IEnumerable "fits" conceptually, plus it gives C# IEnumerable Temel Özellikleri you the benefit of being able to use the object produced in a foreach loop).
diyerek sorarsak şayet C# IEnumerable Temel Özellikleri üst satırlarda bahsettiğimiz üzere o dershaneın geriye IEnumerator nesnesi dönen GetEnumerator isminde metodu çitndırıyor olması demekti. Ee haliyle IEnumerable interface’i ait sınıfa uygulandığında GetEnumerator metodunu implement edecektir.
Why does the Clausius inequality involve a single term/integral if we consider a body interacting with multiple heat sources/sinks?
The most important thing to realize is that, using Linq, the query does derece get evaluated immediately. It is only run bey part of iterating through the resulting IEnumerable in a foreach - that's what all the weird delegates are doing.