5 Basit Teknikleri için C# IEnumerable Nerelerde Kullanılıyor

[Edit] - Needless to say - it's not "either this or that". often it would make good sense to use both a list and an IEnumerable in the same class. No computer in the world could list all prime numbers, because by definition this would require an infinite amount of memory. But you could easily think of a class PrimeContainer which contains an IEnumerable primes, which for obvious reasons also contains a SortedList _primes.

Anything in .Kemiksiz that you emanet iterate over implements IEnumerable. If you're building your own class, and it doesn't already inherit from a class that implements IEnumerable, you sevimli make your class usable in foreach statements by implementing IEnumerable (and by creating an enumerator class that its new GetEnumerator method will return).

g. executing SQL on GarbageCollected contexts). I would say that ICollection is every thing you said apart from the "lazy evaluation" and we should be using that, especially if the veri başmaklık already been enumerated once!

C# IEnumerable tasarrufı oldukça basittir ve genellikle koleksiyonlar üzerinde işlemlemler yapmak derunin tercih edilir. İşte aşama girişim nasıl kullanılacağına konusunda detaylı bir tafsil:

Although there are uses of IEnumerable other than "foreach", the uygun indication that one should implement IEnumerable is that the class is one where it would make sense to say "foreach C# IEnumerable Nasıl Kullanılır foo in classItem foo.do_something(); .

Basically it katışıksız a method to get the next item in the collection. It doesn't need the whole collection to be in memory and doesn't know how many items are in it, foreach just keeps getting the next item until it runs out.

While it might seem that C# IEnumerable Nerelerde Kullanılıyor only array types hayat make use of this construct, the truth of the matter is

For small result sets this is likely to be a single trip, for large ones you're sending a request for more rows from the results, but it doesn't C# IEnumerable Nasıl Kullanılır re-run the entire query.

Where the execution of a query is going to be performed "in process", typically all that's required is the code (kakım code) to execute C# IEnumerable Nerelerde Kullanılıyor each part of the query.

for instance, suppose you decided to read a large file line by line C# IEnumerable Kullanımı and doing something on that, therefore you yaşama write your own ReaderEnumrable to read your file

Here is a very good article that details the differences between statement lambdas and expression lambdas and discusses the concepts of expression tress in greater depth: Revisiting C# delegates, expression trees, and lambda statements vs. lambda expressions.."

Evet öğretmen, onca yazdın çizdin anladıkta iki satır IEnumerable yahut IEnumerator interfacelerini kullanmadın?

If you create an IEnumerable, then all rows will be pulled into memory as objects before running the query.

You should still avoid declaring the parameter type kakım List. Using IList allows the caller to pass arrays and any other objects whose type implements IList.