private bool _TryRelation(out object instance)
{
instance = null;
if (!_Field.FieldType.GetInterfaces().Where(i => i == typeof(IRelatable)).Any())
{
return(false);
}
var rows = from row in _Finder.FindRelatables(_Field.FieldType) select row;
if (!rows.Any())
{
return(false);
}
var colValue = (from col in _Row.GetColumns() where col.Name == _Field.Name select col.Value).FirstOrDefault();
if (colValue == null)
{
return(false);
}
var relatableRows = from relatable in rows
where relatable.Compare(colValue)
select relatable;
try
{
instance = relatableRows.Single();
return(true);
}
catch (System.InvalidOperationException ioe)
{
throw new Exception($"No related type was found. Type:{_Field.DeclaringType.FullName} Related Type:{_Field.FieldType.FullName} Key:{colValue}", ioe);
}
}
public override object Parse(FieldInfo field, IEnumerable <Column> row, ITableable table)
{
var col = row.FirstOrDefault(c => c.Name == field.Name);
if (col.Value == null)
{
return(null);
}
if (!field.FieldType.HasElementType)
{
return(false);
}
var elementType = field.FieldType.GetElementType();
var relatables = table.FindRelatables(elementType).Where(r => r.Compare(col.Value)).ToArray();
var length = relatables.Length;
var val = Array.CreateInstance(elementType, length) as System.Array;
for (int i = 0; i < length; i++)
{
val.SetValue(relatables[i], i);
}
return(val);
}