What is IEnumerable and enumerator in C#?

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. It also has a property called Current. The following shows the implementation of IEnumerable and IEnumerator.

Why do we need IEnumerable in C#?

IEnumerable is best to query data from in-memory collections like List, Array etc. Using IEnumerable we can find out the no of elements in the collection after iterating the collection. IEnumerable supports deferred execution. IEnumerable supports further filtering.

What is IEnumerable in unity?

Conclusion: IEnumerator is a . NET type that is used to fragment large collection or files, or simply to pause an iteration. Coroutine is a Unity type that is used to create parallel actions returning a IEnumerator to do so.

What is an IEnumerator C#?

IEnumerable in C# is an interface that defines one method, GetEnumerator which returns an IEnumerator interface. This allows readonly access to a collection then a collection that implements IEnumerable can be used with a for-each statement.

What is difference between IEnumerable and list in C#?

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 a IEnumerator function?

The IEnumerator allows the program to yield things like the WaitForSeconds function, which lets you tell the script to wait without hogging the CPU.

How does IEnumerator work in C#?

Methods of IEnumerator Interface Sets the enumerator to the next element of the collection; it Returns true if the enumerator was successfully set to the next element and false if the enumerator has reached the end of the collection.

Which is better 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.

What does an IEnumerator do?

IEnumerator is the actual object used to perform the iterations. It controls moving from one object to the next in the list. Most of the time, IEnumerable & IEnumerator are used transparently as part of a foreach loop. IEnumerable is a box that contains Ienumerator.