namespace System.Data.Common
{
    [DefaultMember("Item")]
    public abstract class DbDataReader : MarshalByRefObject, IEnumerable, IDataReader, IDataRecord, IAsyncDisposable, IDisposable
    {
        public virtual Task<ReadOnlyCollection<DbColumn!>!>! GetColumnSchemaAsync(CancellationToken cancellationToken = default);
    }
}