public class List : ICollection, IEnumerable, IEnumerable, IList, IReadOnlyCollection, IReadOnlyList, ICollection, IList

public interface IList : ICollection, IEnumerable, IEnumerable

IList only have Remove() and RemoveAt()... Wouldn't be more interesting put the RemoveAll() method signature in IList for access it?? Neither ICollection or IEnumerable has these methods signatures. Because if I want to remove all items under a specific condition through IList interface I have to transform to a List first

// Enderecos is IList type
       var listEnderecos = clienteModel.Enderecos.ToList();
            listEnderecos.RemoveAll(p => p == null);
            clienteModel.Enderecos = listEnderecos;

With RemoveAll() method in IList

// Enderecos is IList type
       clienteModel.Enderecos.RemoveAll(p => p == null);