Büyülenme Hakkında C# IEnumerable Kullanımı

Büyülenme Hakkında C# IEnumerable Kullanımı

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The difference between IQueryable and IEnumerable is centered around this point. IQueryable builds expression trees whereas IEnumerable does derece, at least not in general terms for those of us who don't work in the secret labs of Microsoft.

I noticed that if I use IEnumerable, when I debug and inspect "sel", which in that case is the IEnumerable, it katışıksız some interesting members: "inner", "outer", "innerKeySelector" and "outerKeySelector", these last 2 appear to be delegates.

Now the thing to note is that IEnumerable brought all the 5 records present in Salary table and then performed an in-memory filteration on the client side to get bütünüyle 2 records. So more veri (3 additional records in this case) got transferred over the network and ate up the bandwidth unnecessarily.

Consider that in your code example a new list created. I don't know what is m_states, but if this is a value types collection, you create a clone of the original list. In this way the returning list gönül be manipulated form the caller Add/Remove/Update elements. without

I have writen about custom IEnumerator. Whats the simplest way to make IEnumerable from it ? ülküsel solution (one line of code) would be if there was some class for that purpose. Or do I have to create my own ?

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Ryan LundyRyan Lundy 208k4141 gold badges183183 silver badges214214 bronze badges 3 4 Then why do we need this IEnumerable abstraction, if the C# IEnumerable Nasıl Kullanılır only thing it does is just provide an access to Enumerator? Why don't just use Enumerator instead

It is a best practice to implement IEnumerable and IEnumerator on your collection classes to enable the foreach (For Each in Visual Basic) syntax, however implementing IEnumerable is not required. If your collection does not implement IEnumerable, you must still follow the iterator pattern to support this syntax by providing a C# IStructuralComparable Nasıl kullanılır GetEnumerator method that returns an interface, class or struct.

Is it legal to initialize an array via a functor which takes the array itself bey a parameter by reference?

This works for read-only access to a collection that implements that IEnumerable birey be used with a foreach statement.

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

Ya hoca, onca yazdın çizdin anladıkta iki satır IEnumerable yahut IEnumerator interfacelerini C# IStructuralComparable nerelerde kullanılıyor kullanmadın?

Reed CopseyReed Copsey 561k7979 gold badges1.2k1.2k silver badges1.4k1.4k bronze badges 3 2 I agree strongly with your point about decoupling from the implementation, but I also think there's a point for making clear the expected usage; even if I C# IStructuralComparable Nasıl kullanılır have a List, referring to it bey IEnumerable makes it clear that the functionality I'm expecting from the collection in that usage is the enumerability functionality, and not any of the other List functionality.

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