What is the difference between IEnumerable and IEnumerator?
The difference between IEnumerable and IEnumerator is IEnumerable works for the generic interface, and IEnumerator works for all non-generic interfaces. IEnumerable points to an object which can be enumerated, but IEnumerator is implemented using each statement for iteration. It acts as an object.
What is an IEnumerator?
IEnumerator is an interface, which when implemented allows you to iterate through the list of controls. To implement it requires that you provide two methods – Reset to go back to the beginning of the list, and MoveNext to move forward, and Current to get the current item.
What is the use of IEnumerator ICollection Idictionary & IList?
ICollection is the most basic of the interfaces you listed. It’s an enumerable interface that supports a Count and that’s about it. IList is everything that ICollection is, but it also supports adding and removing items, retrieving items by index, etc.
What’s the difference between IEnumerable T and list t?
One important difference between IEnumerable and List (besides one being an interface and the other being a concrete class) is that IEnumerable is read-only and List is not. So if you need the ability to make permanent changes of any kind to your collection (add & remove), you’ll need List.
What is IEnumerator interface?
IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. This works for readonly access to a collection that implements that IEnumerable can be used with a foreach statement. IEnumerator has two methods MoveNext and Reset. It also has a property called Current.
What is IEnumerable used for?
IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. It is the base interface for all non-generic collections that can be enumerated. This works for read-only access to a collection that implements that IEnumerable can be used with a foreach statement.
Should I use IEnumerable or IList?
You use IEnumerable when you want to loop through the items in a collection. IList is when you want to add, remove, and access the list contents out of order.
Is it better to use IEnumerable or list?
In terms of performance, the answer is it depends. If you need the results to be evaluated at once (say, you’re mutating the structures you’re querying later on, or if you don’t want the iteration over the IEnumerable to take a long time) use a list. Else use an IEnumerable .
What is IEnumerable in Web API?
IEnumerable interface is a generic interface which allows looping over generic or non-generic lists. IEnumerable interface also works with linq query expression. IEnumerable interface Returns an enumerator that iterates through the collection.
What is difference between IEnumerable and IQueryable?
Both IEnumerable and IQueryable are forward collection. Querying data from a database, IEnumerable execute a select query on the server side, load data in-memory on a client-side and then filter data. Querying data from a database, IQueryable execute the select query on the server side with all filters.
What’s the difference between an IEnumerator and an enumerable?
IEnumerator is an interface implemented by an enumerator and the enumerable class implements the IEnumerable interface. IEnumerable is a basic interface used to obtain an object that knows how to enumerate (or iterate) over the elements in the collection.
What’s the difference between IEnumerator and generic interface?
IEnumerable is a generic interface that provides an abstraction for looping over elements and by implementing the IEnumerable interface, a generic class essentially enables iteration via the IEnumerator interface.
What’s the difference between an IEnumerator and a MoveNext?
IEnumerable has just one method whereas IEnumerator has 2 methods ( MoveNext and Reset) and a property Current. For easy understanding consider IEnumerable as a box that contains IEnumerator inside it (though not through inheritance or containment).
What’s the difference between an IEnumerator and a cursor?
The main difference between IEnumerable and IEnumerator is an IEnumerator retains its cursor’s current state. Let’s understand this practically. Create two static methods in the main program.