En C# IEnumerable Nedir Sırları

En C# IEnumerable Nedir Sırları

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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.

So unless you want to perform operations that are more efficient on the list, this really does mean lower performance.

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 yaşama 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 ? ülkü solution (one line of code) would be if there was some class for that purpose. Or do I have to create my own ?

IEnumerable ve IEnumerator interfaceler’i ile sizlerde oluşturduğunuz sınıflara itere özellikleri kazandırabilir, hatta IEnumerator interface’i ile oluşturduğunuz enumerator’bile isteğinize göre iterasyonun periyodunu ayarlayabilir ve foreach döngüsünde kullanabilirsiniz.

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

the IEnumerable interface, so anything C# IEnumerable Nedir you güç do with a "plain" IEnumerable, you dirilik also do with an IQueryable. IEnumerable just katışıksız a GetEnumerator() method that returns an Enumerator for which you can call its MoveNext() method to iterate through a sequence of T

) without affecting original data." is confusing. Do you mean that the new list returned can been added to, and elements can be removed but no updates? I thought that because it C# IEnumerable Nerelerde Kullanılıyor returned ienumerable you sevimli modify the elements in the list, i.e. change a property like you said but you kişi't add and remove items in the list. Is that correct?

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

Any idea why the Enumerable is "split" into "inner" and "outer"? This happens when I inspect the element in debug/break mode via mouse. Is this perhaps Visual Studio's contribution? Enumerating on the tanıtımcık and indicating input C# IEnumerable Nasıl Kullanılır and output of the Enum?

means that "var myResult" contains all elements from myEnumerableList, only when this element (here, called 'u')saf a property userId that is equal to "Yusuf"

My question is that should these classes instead implement C# IEnumerable Temel Özellikleri the IEnumerable interface, and call GetEnumerator on the List itself.

You should still avoid declaring the parameter type birli List. Using IList allows the caller to pass C# IEnumerable Kullanımı arrays and any other objects whose type implements IList.