DotNext by Roman Sakno

<PackageReference Include="DotNext" Version="0.6.0" />

.NET API 117,760 bytes

 CollectionType

public static class CollectionType
Provides specialized reflection methods for collection types.
public static Type GetItemType(this Type collectionType, out Type enumerableInterface)

Obtains type of items in the collection type.

public static Type GetItemType(this Type collectionType)

Obtains type of items in the collection type.