What is difference between IEnumerable and IEnumerator?

What is difference between IEnumerable and IEnumerator?

IEnumerable and IEnumerator both are interfaces in C#. IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. IEnumerator has two methods MoveNext and Reset. …

What is difference between IEnumerable and IEnumerator in C#?

An IEnumerator is a thing that can enumerate: it has the Current property and the MoveNext and Reset methods (which in . NET code you probably won’t call explicitly, though you could). An IEnumerable is a thing that can be enumerated…which simply means that it has a GetEnumerator method that returns an IEnumerator .

What is difference between IEnumerable and IList?

An IEnumerable does not hold even the count of the items in the list, instead, you have to iterate over the elements to get the count of items. An IList can perform all operations combined from IEnumerable and ICollection, and some more operations like inserting or removing an element in the middle of a list.

What is 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 IQueryable in C#?

IQueryable exists in the System. Linq Namespace. IQueryable is suitable for querying data from out-memory (like remote database, service) collections. While querying data from a database, IQueryable executes a “select query” on server-side with all filters. IQueryable is beneficial for LINQ to SQL queries.

When we will use IEnumerable in C#?

IEnumerable is best to query data from in-memory collections like List, Array etc. IEnumerable doesn’t support add or remove items from the list. Using IEnumerable we can find out the no of elements in the collection after iterating the collection. IEnumerable supports deferred execution.

Which is better IEnumerable or IQueryable?

IEnumerable: IEnumerable is best suitable for working with in-memory collection (or local queries). IEnumerable doesn’t move between items, it is forward only collection. IQueryable: IQueryable best suits for remote data source, like a database or web service (or remote queries).

Why IEnumerable is used in C#?

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.

Is IEnumerator an interface?

IEnumerator is the base interface for all non-generic enumerators. Its generic equivalent is the System. Collections. You must call the MoveNext method to advance the enumerator to the first element of the collection before reading the value of Current; otherwise, Current is undefined.

What’s the difference between the IEnumerator interface in C #?

Difference between IEnumerator and IEnumerable Interface in C#. IEnumerable and IEnumerator both are interfaces in C#. 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.

What’s the difference between the IEnumerator and the GetEnumerator?

If you go to the definition of the IEnumerable interface, you will see this interface has a method GetEnumerator () that returns an IEnumerator object back. In short, this IEnumerable uses IEnumerator internally. The main difference between IEnumerable and IEnumerator is an IEnumerator retains its cursor’s current state.

What’s the difference between an enumerable and an IEnumerable?

IEnumerable- It is an Interface and Exposes the enumerator, which supports a simple iteration over a collection of a specified type.Enumerable- It is a class and Provides a set of static methods for querying objects that implement IEnumerable. IEnumerable is an interface.

What’s the difference between IEnumerator and generic class?

IEnumerable is the generic interface available for collection type objects and by implementing the IEnumerable interface, a generic class essentially enables iteration via the IEnumerator interface. It uses only one method GetEnumerator that returns an enumerator class instance that implement IEnumerator…