C# IEnumerable Nasıl Kullanılır Aptallar için

C# IEnumerable Nasıl Kullanılır Aptallar için

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Implementation of IEnumerable is generally the preferred way for a class to indicate that it should be usable with a "foreach" loop, and that multiple "foreach" loops on the same object should operate independently.

Örneğin oluşturduğumuz bir List içine biz Add komutu ile ekleme yapabiliyoruz veya Count ile içinde kâin elemanların sayısını alabiliyoruz ve bunu foreach içerisinde kullanabiliyoruz. Pekâlâ List bir klas olmasına mukabil foreach nasıl buna müsaade veriyor?

An IEnumerable is a thing that birey be enumerated...which simply means that it has a GetEnumerator method that returns an IEnumerator.

Now List implements IEnumerable, but represents the entire collection in memory. If you have an IEnumerable and you call .ToList() you create a new list with the contents of the enumeration in memory.

An Enumerable is a class that dirilik give you Enumerators. It özgü a method called GetEnumerator which gives you an Enumerator that looks at its items. When you write a foreach loop in C#, the code that it generates calls GetEnumerator to create the Enumerator used by the loop.

The compiler performs pattern matching. The GetEnumerator method just needs to return a class / struct which in turn başmaklık a Current property and a MoveNext method that returns a bool. I sevimli highly recommend Eric Lipperts blog post about pattern matching

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

It katışıksız C# IEnumerable Kullanımı a good performance when you are iterating through big objects or collections because it does derece load the entire object to memory in order to make iteration.

What US checks and balances prevent the FBI from raiding politicians unfavorable to the federal government?

Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k C# IEnumerable Nasıl Kullanılır 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 C# IEnumerable Nedir return identical veri or throw an exception; an ordinary IEnumerable whose collection was modified should be allowed C# IEnumerable Nasıl Kullanılır to return 'sensible' data if it's able to do so or throw an exception if it gönül'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.

Oh sure, you sevimli use it to create your own custom collection types. But for everyday stuff, it probably isn't kakım useful kakım the collections derived from it.

Evet öğretmen, onca yazdın çizdin anladıkta iki satır IEnumerable yahut IEnumerator interfacelerini kullanmadın?

In simple words other major difference is that IEnumerable execute select query on server side, load veri in-memory on client side and then filter veri while IQueryable execute select query on server side with all filters.

Below mentioned small sınav might help you understand one aspect of difference between IQueryable and IEnumerable. C# IEnumerable Nerelerde Kullanılıyor I've reproduced this answer from this post where I was trying to add corrections to someone else's post