The ToList<TSource>(IEnumerable<TSource>) method forces immediate query evaluation and returns a List<T> that contains the query results. You can append this method to your query in order to obtain a cached copy of the query results.

May 5, 2010 · One way of phrasing it, is that .ToList() makes a shallow copy. The references are copied, but the new references still point to the same instances as the original references point to. When you think of it, ToList cannot create any new MyObject() when MyObject is a class type.

Feb 22, 2013 · ToList() is called, calling MoveNext() on the enumerable returned from Where(). Where() now calls MoveNext() on the original collection and gets the value. Where() calls your predicate, which returns true. MoveNext() called from ToList() returns, ToList() gets the value and adds it to the list.

Mar 20, 2013 · Yes, IEnumerable<T>.ToList() does have a performance impact, it is an O(n) operation though it will likely only require attention in performance critical operations. The ToList() operation will use the List(IEnumerable<T> collection) constructor.

Apr 21, 2023 · This C# extension method converts collections (IEnumerables) to List instances. It is fast and easy-to-remember. It returns a List instance with the appropriate elements.

The LINQ ToList and ToArray methods in C# are used to convert collections or sequences to a List<T> or an array T[], respectively. Both methods are part of the System.Linq namespace can be applied to any type implementing IEnumerable<T>.

'ToList()' creates dynamic lists that can change in size, giving flexibility. 'ToArray()' makes fixed-size arrays, which are faster and have strong type safety. Use 'ToList()' when you need a dynamic collection, and 'ToArray' when the size is known.

Feb 16, 2024 · Convert IEnumerable to a List in C# Using the ToList() Method. The most straightforward and widely used method for converting an IEnumerable to a List is by using the ToList() method provided by the System.Linq namespace.

In C#, this can be achieved using the `ToList()` method provided by LINQ (Language Integrated Query) or by using the `List<T>` constructor, passing the array as an argument. Both approaches enable seamless conversion, allowing for easier manipulation and utilization of the collection&#39;s elements.

May 1, 2015 · Use ToList() when you want to execute the query. Don't use ToList() when your enumerable (and therefore your query) gets extended at a later point in your code (for example by another where condition). –