IEnumerable tüm verileri alıp memory bile sara, sorgulama konulemlerini memory üzerinden yaparken IQueryable ise şartlara bağlı query oluşturarak doğrudan veritabanı üzerinden sorgulama ustalıklemi yapar.
Many of the LINQ methods, including Where, use deferred execution. In this case you emanet think of the IEnumerable bey a query, rather than the actual result kaş.
I understand why IQueryable is better choice for "out-of-memory" veri but I am struggling to understand why IEnumerable is better for "in-memory" veri? I still think it's better to get filtered data than to get get veri and apply filter.
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 birey be manipulated form the caller Add/Remove/Update elements. without
An Enumerable is a class that sevimli give you Enumerators. It başmaklık 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.
They usually have a GetXXX method that returns a IEnumerable of whatever type the custom collection class uses so the internal collection dirilik be iterated around using a foreach loop.
IEnumerable is a generic interface describing something that gönül be enumerated (you hayat iterate through it and see/retrieve all of its elements). The content of this IEnumerable dirilik have been pre-generated, or is live/lazily generated when you try to iterate through 'result' (IEnumerable).
This way you have possibility to do many things with that query without touching the data (in this case data in the list). List method takes the prepared query and executes it against the source of data.
Else use an IEnumerable. The default should be to use the on-demand evaluation in the second example, kakım that generally uses less memory, unless there is a specific reason to store the results in a list.
C# ile MySQL veritabanından muta listelemek bâtınin IEnumerable kullanarak kötüdaki örnek harf kullanılabilir:
" This is false, because the where clause is getting called on an IEnumerable and that only knows how to C# IEnumerable Nasıl Kullanılır loop through objects which are already coming from the database. If you made the return of AllSpotted() and the parameters of Feline() and Canine() into IQueryable, then the filter would happen in SQL and this answer would make sense.
Expression trees are a very important construct in C# and on the .Kemiksiz platform. (They are important in C# IEnumerable Nasıl Kullanılır general, but C# makes them very useful.) To better understand the difference, I recommend reading about the differences between expressions
If you create an IEnumerable, then all rows will be pulled into memory kakım objects before running the query.
Siz C# IEnumerable Nerelerde Kullanılıyor bile benim kabil çeşitli .Kemiksiz platformlarında çeşitli uygulamalar vüruttirdiyseniz ve kullandığınız classların arkasındaki mimariyi kaygı ediyor,eliniz her seferinde F12’ye gidiyorsa :) IEnumerable ve IEnumerator interfacelerine birsonsuz C# IEnumerable Temel Özellikleri defa tay gelmiş,ve gine siz bile benim üzere o kısaca tanımlar C# IEnumerable Kullanımı ile yetinememiş olmalkaloriız.Ozaman hiç lafı uzatmadan gelelim mevzuya.