❔ ✅ Best way to just get not null values from a collection of possibly null values

I've got a

List<MyType?>

List<MyType?>

, and I want to filter out all null values and get a

List<MyType

List<MyType

back.

Which of these is preferable (and more idiomatic) for this, or is there a 3rd better way:

List<MyType> validTypes = possiblyNullTypes.Where(item => item is not null).Cast<MyType>().ToList();
List<MyType> validTypes = possiblyNullTypes.Where(item => item is not null).Select(item => item!).ToList();

List<MyType> validTypes = possiblyNullTypes.Where(item => item is not null).Cast<MyType>().ToList();
List<MyType> validTypes = possiblyNullTypes.Where(item => item is not null).Select(item => item!).ToList();

Thanks

C#•3y ago•

31 replies

Hugh

❔ ✅ Best way to just get not null values from a collection of possibly null values

I've got a

List<MyType?>

List<MyType?>

, and I want to filter out all null values and get a

List<MyType

List<MyType

back.

Which of these is preferable (and more idiomatic) for this, or is there a 3rd better way:

List<MyType> validTypes = possiblyNullTypes.Where(item => item is not null).Cast<MyType>().ToList();
List<MyType> validTypes = possiblyNullTypes.Where(item => item is not null).Select(item => item!).ToList();

List<MyType> validTypes = possiblyNullTypes.Where(item => item is not null).Cast<MyType>().ToList();
List<MyType> validTypes = possiblyNullTypes.Where(item => item is not null).Select(item => item!).ToList();

Thanks

❔ ✅ Best way to just get not null values from a collection of possibly null values

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