C# IEnumerable Nasıl Kullanılır Günlükler

C# IEnumerable Nasıl Kullanılır Günlükler

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IEnumerable ve IQueryable çoğu vüruttirici aracılığıyla kullanmaı karıştırılmakta ve ne mevsim nerede kullanılacağı bilinmemektedir.

Down Below I took part of a code I was looking at. I don't understand the IEnumerable part of the Code. Emanet someone just walk me through the meaning of each line. Thanks

Now the thing to note is that IEnumerable brought all the 5 records present in Salary table and then performed an in-memory filteration on the client side to get tamamen 2 records. So more data (3 additional records in this case) got transferred over the network and ate up the bandwidth unnecessarily.

But now see the below code we have changed IEnumerable to IQueryable. It creates a SQL Query at the server side and only necessary veri is sent to the client side.

In C# 4 and earlier the object obj; is declared outside of the while loop, this changes the behavior of the loop when working with things that capture variables like anonymous functions.

Why do many philosophers consider a past-eternal universe to be self-explanatory but not a universe that began with no cause?

// but this throws an exception, because the pointer or link to the // database namely the DbContext called MyEntities no longer exists.

Koleksiyonlar Beyninde Gezinmeyi Sağlamlar: IEnumerable, koleksiyonlar arasında kolay gezinmenizi esenlar. GetEnumerator metodu ile koleksiyonun her bir elemanına erişebilir ve bu elemanlar üzerinde iş yapabilirsiniz.

The major difference between IQueryable and IEnumerable is that IQueryable executes query with filters whereas IEnumerable executes the query first and then it filters the data based on conditions.

Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze C# IStructuralComparable Temel Özellikleri badges 1 1 The mistake with "Reset" was with just having one type of enumerable. IMHO, there should have been an IMultipassEnumerable, inheriting IEnumerable, which would support Reset and guarantee that multiple passes will either return identical data or throw an exception; an ordinary IEnumerable whose collection was modified should be allowed to return 'sensible' data if it's able C# IStructuralComparable Nasıl kullanılır to do so or throw an exception if it güç't, and an ISafeEnumerable, which would be expected to work sensibly (without throwing an exception) even if a collection changes. A bit late now to change things, though.

And that might be useful and more efficient in certain cases. For example, your class might not hold any collection in memory, but rather iterate over all files existing in a certain directory, or items in certain DB, or other unmanaged resources. IEnumerable yaşama step in and do it for you (you could also do it without IEnumerable, but IEnumerable "fits" conceptually, plus it gives you the benefit of being able to use the object produced in a foreach loop).

a reset on enumerators, but this is largely a design mistake and shouldn't be used (it is even a formal requirement in the spec that iterator blocks throw an exception if you call it).

If the collection supports indexers, you could also iterate over it with the classic for loop method but the Iterator pattern C# IStructuralComparable Nasıl kullanılır provides some birçok extras like the ability to add synchronization for threading.

Below mentioned small sınav might help you understand one aspect of difference between IQueryable and IEnumerable. I've reproduced this answer from this C# IStructuralComparable nerelerde kullanılıyor post where I was trying to add C# IStructuralComparable nerelerde kullanılıyor corrections to someone else's post