/// <summary>
/// Gets metadata as optional value.
/// </summary>
/// <typeparam name="TMetadata">Metadata type.</typeparam>
/// <param name="metadataProvider">Metadata provider.</param>
/// <param name="metadataName">Optional metadata name.</param>
/// <returns>Metadata or default value if not found.</returns>
public static Option <TMetadata> GetMetadataAsOption <TMetadata>(
this IMetadataProvider metadataProvider,
string metadataName = null)
{
metadataProvider.AssertArgumentNotNull(nameof(metadataProvider));
metadataName ??= typeof(TMetadata).FullName;
var metadata = metadataProvider.Metadata ?? metadataProvider.GetInstanceMetadata();
var propertyValue = metadata.GetPropertyValue <TMetadata>(Search
.ByNameAndComparer <TMetadata>(metadataName, MetadataProvider.DefaulPropertyComparer)
.ReturnNull());
if (propertyValue.HasValue() && !propertyValue.Value.IsNull())
{
return(propertyValue.Value);
}
return(Option <TMetadata> .None);
}
