5 Basit Teknikleri için C# IEnumerable Nerelerde Kullanılıyor

5 Basit Teknikleri için C# IEnumerable Nerelerde Kullanılıyor

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IEnumerable ve IQueryable çoğu vüruttirici aracılığıyla yararlanmaı karıştırılmakta ve ne ahit nerede kullanılacağı bilinmemektedir.

Yani daha çok custom bir enumerator klası yazmamıza gerek yasak yield keyword'ü ile compiler bunu ense planda bizim bağırsakin strüktüryor.

The second example returns an IEnumerable that contains all the information needed to run the query later on.

Analogy: Imagine you are a detective on an aeroplane . You need to work your way through all the passengers to find your suspect.

C# IEnumerable, IEnumerator Meyan yüzleri ve Kullanmaı hatsında bahsettiğimiz kabil bir derslikımızın iterator özelliği kazanabilmesi bağırsakin IEnumerable yahut IEnumerable interfacelerini implemente etmesi gerekmektedir.

C# IEnumerable Extensions, C#’da bilincinde olarak ya da olmayarak sıkça IEnumerable’dan türemiş nesneleri kullanmaktayız. Evet nedir bu IEnumerable sorusuna yanıt verecek olursak, IEnumerable interface’i bizlere bir collection üzerinde iterasyon yapabilmemize olanak sağlamaktadır.

IQueryable allows for out-of memory things like a remote veri source, such as a database or web service.

So, the first example evaluates the query immediately by calling ToList and putting the query results in a list.

Now what makes IEnumerable really stand out is iterator blocks (the yield keyword in C#). Iterator blocks implement the IEnumerable interface like a List or an Array, but they're very special because unlike a List or Array, they often only hold the state for a single item at a time. So C# IEnumerable Kullanımı if you want to loop over the lines in a very large file, for example, you kişi write an iterator block to handle the file input.

There are pros and cons to both. If you call ToList, you may remove some mystery as to when the query gets executed. If you stick to IEnumerable, you get the advantage that the program doesn't do any work until it's actually required.

This takes an IEnumerator factory function, which usually can be provided very easily instead of C# IEnumerable Nedir the single IEnumerator instance (which yields wrong results after first iteration and breaks the semantics of IEnumerable). This avoids the issues marked by Marc Gravell and establishes full IEnumerable behavior.

There's also the issues of deferred execution and unmanaged resources. IEnumerable takes use of the yield syntax, which mean you go over each item by-itself and birey perform all kinds of computations before and after. And again, this happens one-by-one, so you don't have to hold all the collection when you start. The computations won't actually be performed until the enumeration begins (i.e. until you run the foreach loop).

Reed CopseyReed Copsey 561k7979 gold badges1.2k1.2k silver badges1.4k1.4k bronze badges 3 2 C# IEnumerable Temel Özellikleri I agree strongly with your point about decoupling from the C# IEnumerable Nedir implementation, but I also think there's a point for making clear the expected usage; even if I have a List, referring to it kakım IEnumerable makes it clear that the functionality I'm expecting from the collection in that usage is the enumerability functionality, and hamiş any C# IEnumerable Nasıl Kullanılır of the other List functionality.

The first method advances to the next object in the IEnumerable object that created the enumerator, returning false if it's done, and the second returns the current object.