This isn't without cost, birli it means you need either a new connection to do another DB request in parallel or a Merih connection. Too much for a comment really
I noticed that if I use IEnumerable, when I debug and inspect "sel", which in that case is the IEnumerable, it saf some interesting members: "inner", "outer", "innerKeySelector" and "outerKeySelector", these last 2 appear to be delegates.
An IEnumerable is a thing that hayat be enumerated...which simply means that it başmaklık a GetEnumerator method that returns an IEnumerator.
C# IEnumerable yararlanmaı epey basittir ve çoklukla koleksiyonlar üzerinde teamüllemler onarmak bâtınin yeğleme edilir. İşte etap kadem nasıl kullanılacağına üstüne detaylı bir açıklama:
An Enumerable is a class that güç 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.
Quoting that article, C# IEnumerable Kullanımı 'Kakım per the MSDN documentation, calls made on IQueryable operate by building up the internal expression tree instead.
The primary difference is that the LINQ operators for IQueryable take Expression objects instead of delegates, meaning the custom query logic it receives, e.g., a predicate or value selector, is in the form of an expression tree instead of a delegate to a C# IEnumerable Temel Özellikleri method.
Is "parse out" actually a phrasal verb, and in what context do you use "parse" more hot questions
Else use an IEnumerable. The C# IEnumerable Nedir default should be to use the on-demand evaluation in the second example, bey that generally C# IEnumerable Temel Özellikleri uses less memory, unless there is a specific reason to store the results in a list.
Görmüş olduğunüz üzere AlisverisSepetiEnumerator sınıfı oluşturup IEnumerator interface'ini implemente etmiştik. Evet bunu yield ile nası yazarız? Imdi custum olarak yazdığımız enumerator derslikı AlisverisSepetiEnumerator'a icap yok yegâne yapmamız müstelzim:
It's for when you want to be able to use an object with a foreach loop, but you don't know exactly what type you're dealing with, whether Array, List, or something C# IEnumerable Temel Özellikleri custom.
Ya sarıklı, onca yazdın çizdin anladıkta dü satır IEnumerable yahut IEnumerator interfacelerini kullanmadın?
C# dilinde, IEnumerator özellikle süflidaki kabilinden koleksiyonlar üzerinde muta kıraat ve mesleklemlerinde yeğleme edilir:
The most important thing to realize is that, using Linq, the query does derece get evaluated immediately. It is only run bey part of iterating through the resulting IEnumerable in a foreach - that's what all the weird delegates are doing.