public MasterDetailCollectionMaterializer(DbCommandBuilder <TCommand, TParameter> commandBuilder, string masterKeyColumn, Func <TMaster, ICollection <TDetail> > map, CollectionOptions masterOptions, CollectionOptions detailOptions) : base(commandBuilder)
{
m_MasterKeyColumn = masterKeyColumn;
m_Map = map;
if (masterOptions.HasFlag(CollectionOptions.InferConstructor))
{
m_MasterConstructor = MaterializerUtilities.InferConstructor(s_MasterMetadata);
}
if (detailOptions.HasFlag(CollectionOptions.InferConstructor))
{
m_DetailConstructor = MaterializerUtilities.InferConstructor(s_DetailMetadata);
}
}
/// <summary>
/// Materializers use this to pick a constructor.
/// </summary>
/// <returns></returns>
/// <exception cref="MappingException"></exception>
protected ConstructorMetadata InferConstructor()
{
return(MaterializerUtilities.InferConstructor(ObjectMetadata));
}
public override IReadOnlyList <string> DesiredColumns()
{
//We need to pick the constructor now so that we have the right columns in the SQL.
//If we wait until materialization, we could have missing or extra columns.
if (m_MasterConstructor == null && !s_MasterMetadata.Constructors.HasDefaultConstructor)
{
m_MasterConstructor = MaterializerUtilities.InferConstructor(s_MasterMetadata);
}
if (m_DetailConstructor == null && !s_DetailMetadata.Constructors.HasDefaultConstructor)
{
m_DetailConstructor = MaterializerUtilities.InferConstructor(s_DetailMetadata);
}
var masterColumns = (m_MasterConstructor == null) ? s_MasterMetadata.ColumnsFor : m_MasterConstructor.ParameterNames;
var detailColumns = (m_DetailConstructor == null) ? s_DetailMetadata.ColumnsFor : m_DetailConstructor.ParameterNames;
//Sanity checks
if (m_IncludedColumns != null && m_ExcludedColumns != null)
{
throw new InvalidOperationException("Cannot specify both included and excluded columns/properties.");
}
if (m_ExcludedColumns != null && (m_MasterConstructor != null || m_DetailConstructor != null))
{
throw new InvalidOperationException("Cannot specify excluded columns/properties with non-default constructors.");
}
if (masterColumns.Length == 0)
{
throw new MappingException($"Type {typeof(TMaster).Name} has no writable properties. Please use the InferConstructor option or the WithMasterConstructor method.");
}
if (detailColumns.Length == 0)
{
throw new MappingException($"Type {typeof(TDetail).Name} has no writable properties. Please use the InferConstructor option or the WithMasterConstructor method.");
}
//Assembly the list
var columnNames = new HashSet <string>(); //using this to filter out duplicates
if (m_IncludedColumns != null)
{
columnNames.AddRange(m_IncludedColumns);
}
else //Use the previously found values
{
columnNames.AddRange(masterColumns);
columnNames.AddRange(detailColumns);
if (m_ExcludedColumns != null)
{
foreach (var column in m_ExcludedColumns)
{
columnNames.Remove(column);
}
}
}
columnNames.Add(m_MasterKeyColumn); //Force this to always be included.
return(columnNames.ToImmutableArray());
}
