C# IEnumerable Nasıl Kullanılır Ile ilgili detaylı notlar

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@OlivierJacot-Descombes: Short of using Reflection, there's no way of knowing whether an IList which allows anything of a given type to be stored by index will allow everything of that type to be stored by index.

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. If you need the results to be evaluated at once (say, you're mutating the structures you're querying later on, or if you don't want the iteration over the IEnumerable to take a long time) use a list.

It's effectively usage bey documentation of intent; I find that those explicit documentations of intent tend to provide exactly that decoupling you point out.

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).

Quoting that article, 'Birli per the MSDN documentation, calls made on IQueryable operate by building up the internal expression tree instead.

So if I am going through all the items on ebay, one at a time would be something even a small computer yaşama handle, but ".ToList()" would surely run me out of memory, no matter how big my computer was. No computer sevimli by itself contain and handle such a huge amount of data.

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

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IEnumerable ve IQueryable aradındaki nüansı anlatmadan önce kısaca bu C# IEnumerable Kullanımı iki interface klasını tanılamayalım.

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 yaşama perform all C# IEnumerable Nasıl Kullanılır 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 C# IEnumerable Nasıl Kullanılır (i.e. until you run the foreach loop).

Bu yazgımızın gelecek satırlarında IEnumerator interface’ini detaylandırırken, kendi enumeratorümüzü oluşturmayıda sermayeşacağız. Amma şimdilik bu örneğimizde koleksiyon C# IEnumerable Nasıl Kullanılır yahut kol kuruluşlarının GetEnumerator metodunu kullanmamız aksiyonimizi yeterince görmektedir.

By "functionally equivalent," I mean that's actually what the compiler turns the code into. You hayat't use foreach on temel in this example unless