5 Temel Unsurları için C# IEnumerable Kullanımı

5 Temel Unsurları için C# IEnumerable Kullanımı

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So is it faster to use List over IEnumerable? Only if you want to prevent a query from being executed more than once. But is it better overall? Well in the above, Leopards and Hyenas get converted into single SQL queries each

Many of the LINQ methods, including Where, use deferred execution. In this case you gönül think of the IEnumerable kakım a query, rather than the actual result takım.

This where filter is executed on the client side where the IEnumerable code is. In other words all the data is fetched from the database and then at the client its scans and gets the record with EmpId is 2.

If on the second house, I decide to alter the price (say add one million dollars to the price) - the entire list would change (the order is now different). "one at a time" and "all of them right now" are two different things.

(birli per Mike P's excellent answer) wrap an enumerator to pretend to be enumerable, there are some things that you yaşama't really do - for example, it is hoped

IEnumerator is a class that enumerates collections. A class that implements IEnumerable returns an IEnumerator. A class that implements IEnumerator saf custom enumeration logic.

Ryan LundyRyan Lundy 208k4141 gold badges183183 silver badges214214 bronze badges 3 4 Then why do we need this IEnumerable abstraction, if the only thing it does is just provide an access to Enumerator? Why don't just use Enumerator instead

the IEnumerable interface, C# IStructuralComparable Nasıl kullanılır so anything you yaşama do with a "plain" IEnumerable, you güç also do with an IQueryable. IEnumerable just saf a GetEnumerator() method that C# IStructuralComparable Temel Özellikleri returns an Enumerator for which you emanet call its MoveNext() method C# IStructuralComparable nerelerde kullanılıyor to iterate through a sequence of T

but this violates the IEnumerable semantics and the time came when I got wrong results. so switched to orderly C# IStructuralComparable Kullanımı creating a fresh iterator instance (see my answer)

for instance, suppose you decided to read a large file line by line and doing something on that, therefore you güç write your own ReaderEnumrable to read your file

Will I run into issues if I connect a shunt 50 ohm resistor over a high impedance input pin on an IC?

Why does the Clausius inequality involve a single term/integral if we consider a body interacting with multiple heat sources/sinks?

IQueryable is faster than IEnumerable if we are C# IStructuralComparable Kullanımı dealing with huge amounts of veri from database because,IQueryable gets only required veri from database where as IEnumerable gets all the data regardless of the necessity from the database

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