/// <summary>
/// Initialise a new ObjectDataReader.
/// </summary>
/// <param name="collection">The collection of things to make a data reader over.</param>
/// <param name="nullConversion">How to treat System.Nullable types.</param>
public ObjectDataReader(IEnumerable <T> collection, NullConversion nullConversion)
{
collection.ThrowIfNull("collection");
this.NullConversion = nullConversion;
this.Enumerator = collection.GetEnumerator();
// Done without a lock, so we risk running twice.
// n.b. This is a scalar property, so the intention is that it is only
// discovered once per instantiation of the app domain.
if (scalarAttributes == null)
{
scalarAttributes = DiscoverScalarAttributes(typeof(T));
}
Attributes = scalarAttributes;
}
/// <summary>
/// Wraps the IEnumerable in a DbDataReader, having one column for each "scalar" property of the type T.
/// The collection will be enumerated as the client calls IDataReader.Read().
/// </summary>
/// <typeparam name="T">The element type of the collectin.</typeparam>
/// <param name="collection">A collection to wrap in a DataReader</param>
/// <param name="exposeNullableColumns"></param>
/// <returns>An IDataReader wrapping the collection.</returns>
public static IDataReader AsDataReader <T>(this IEnumerable <T> collection, NullConversion nullConversion)
{
collection.ThrowIfNull("collection");
return(new ObjectDataReader <T>(collection, nullConversion));
}