If an airline is "countable", this means that there MUST be a flight attendant present on the plane, whose sole job is to count:
In case of IEnumerable, only lines up to the element of interest will be read from the file. In case of ToList call over the enumerable, the entire file would be read before even starting the search.
GetEnumerator metodu, bir sınıfa iterasyon dokumalarını kazandıracak özellikleri barındıran IEnumerator nesnesi dönen bir metotdur.
e., using IEnumerable instead of List where possible) provides exactly that decoupling while also requiring proper design philosophy. That is to say, you gönül achieve decoupling but hamiş achieve minimal dependency, but you cannot achieve minimal dependency without achieving maximal decoupling.
What about IEnumerable, its just a way to make a returning type generic, and hamiş make strong coupling to List type.
So if you working with only in-memory veri collection IEnumerable is a good choice but if you want to query veri collection which is connected with database `IQueryable is C# IEnumerable Nasıl Kullanılır a better choice birli it reduces network traffic and uses the power of SQL language.
The "inner" member does not have "Animal" instances in C# IEnumerable Kullanımı it, but rather "Species" instances, which was very strange for me. The "outer" member does C# IEnumerable Kullanımı contain "Animal" instances. I presume that the two delegates determine which goes in and C# IEnumerable Temel Özellikleri what goes out of it?
So, the first example evaluates the query immediately by calling ToList and putting the query results in a list.
Is it legal to initialize an array via a functor which takes the array itself birli a parameter by reference?
Görmüş olduğunüz kabilinden AlisverisSepetiEnumerator sınıfı oluşturup IEnumerator interface'ini implemente etmiştik. Pekâlâ bunu yield ile nası kalem erbabıız? Artık custum olarak yazdığımız enumerator derslikı AlisverisSepetiEnumerator'a ister yasak hiçbir yapmamız müstelzim:
Oh sure, you güç use it to create your own custom collection types. But for everyday stuff, it probably isn't birli useful birli the collections derived from it.
means that "var myResult" contains all elements from myEnumerableList, only when this element (here, called 'u')özgü a property userId that is equal to "Yusuf"
In simple words other major difference is that IEnumerable execute select query on server C# IEnumerable Temel Özellikleri side, load veri in-memory on client side and then filter data while IQueryable execute select query on server side with all filters.
You should still avoid declaring the parameter type as List. Using IList allows the caller to pass arrays and any other objects whose type implements IList.