What is IEnumerable in C# example?

What is IEnumerable in C# example?

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.

How is IEnumerable implemented?

To implement IEnumerable/IEnumerable, you must provide an enumerator. You can do this in one of three ways: If the class is “wrapping” another collection, by returning the wrapped collection’s enumerator. Via an iterator using yield return.

Is array an IEnumerable C#?

All arrays implement IList, and IEnumerable. You can use the foreach statement to iterate through an array.

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.

Is a list An IEnumerable?

List implements IEnumerable, but represents the entire collection in memory. LINQ expressions return an enumeration, and by default the expression executes when you iterate through it using a foreach, but you can force it to iterate sooner using .

Is IEnumerable in memory?

While querying data from the database, IEnumerable executes “select query” on the server-side, loads data in-memory on the client-side and then filters the data. IEnumerable is beneficial for LINQ to Object and LINQ to XML queries.

What is the difference between IEnumerable and List?

Is list faster than IEnumerable?

So it isn’t that IEnumerable is more efficient than list in a “performance” or “runtime” aspect. It’s that IEnumerable is a more efficient design construct because it’s a more specific indication of what your design requires. (Though this can lead to runtime gains in specific cases.)