Is it better to use IEnumerable or list?
Rachel Hickman
Published Feb 25, 2026
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.
Is IEnumerable faster than list?
We aren’t forcing the caller to convert their data structure to a List unnecessarily. 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.
Is a list 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 .
Can IEnumerable be sorted?
OrderBy(IEnumerable, Func) Sorts the elements of a sequence in ascending order according to a key.
Does List implement IEnumerable?
List implements the interface Ienumerable.so it Includes all methods of IEnumerable.
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 OrderBy in Linq?
LINQ OrderBy operator comes first in LINQ Sorting Operators. OrderBy operator sort the sequence (collection) based on particular property in ascending order. We can use OrderBy operator both in Query Syntax and Method Syntax.
How does Linq OrderBy sort?
OrderBy sorts the values of a collection in ascending or descending order. It sorts the collection in ascending order by default because ascending keyword is optional here. Use descending keyword to sort collection in descending order.
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.
