internal DataRecordObjectView(
IObjectViewData <DbDataRecord> viewData, object eventDataSource, RowType rowType, Type propertyComponentType)
: base(viewData, eventDataSource)
{
if (!typeof(IDataRecord).IsAssignableFrom(propertyComponentType))
{
propertyComponentType = typeof(IDataRecord);
}
_rowType = rowType;
_propertyDescriptorsCache = MaterializedDataRecord.CreatePropertyDescriptorCollection(_rowType, propertyComponentType, true);
}
private PropertyDescriptorCollection InitializePropertyDescriptors()
{
if (this._values == null)
{
return((PropertyDescriptorCollection)null);
}
if (this._propertyDescriptors == null && 0 < this._values.Length)
{
this._propertyDescriptors = MaterializedDataRecord.CreatePropertyDescriptorCollection(this.DataRecordInfo.RecordType.EdmType as StructuralType, typeof(MaterializedDataRecord), true);
}
return(this._propertyDescriptors);
}
PropertyDescriptorCollection ITypedList.GetItemProperties(PropertyDescriptor[] listAccessors)
{
PropertyDescriptorCollection propertyDescriptors;
if (listAccessors == null ||
listAccessors.Length == 0)
{
// Caller is requesting property descriptors for the root element type.
propertyDescriptors = _propertyDescriptorsCache;
}
else
{
// Use the last PropertyDescriptor in the array to build the collection of returned property descriptors.
var propertyDescriptor = listAccessors[listAccessors.Length - 1];
var fieldDescriptor = propertyDescriptor as FieldDescriptor;
// If the property descriptor describes a data record with the EDM type of RowType,
// construct the collection of property descriptors from the property's EDM metadata.
// Otherwise use the CLR type of the property.
if (fieldDescriptor != null &&
fieldDescriptor.EdmProperty != null &&
fieldDescriptor.EdmProperty.TypeUsage.EdmType.BuiltInTypeKind == BuiltInTypeKind.RowType)
{
// Retrieve property descriptors from EDM metadata.
propertyDescriptors =
MaterializedDataRecord.CreatePropertyDescriptorCollection(
(RowType)fieldDescriptor.EdmProperty.TypeUsage.EdmType, typeof(IDataRecord), true);
}
else
{
// Use the CLR type.
propertyDescriptors = TypeDescriptor.GetProperties(GetListItemType(propertyDescriptor.PropertyType));
}
}
return(propertyDescriptors);
}
PropertyDescriptorCollection ITypedList.GetItemProperties(
PropertyDescriptor[] listAccessors)
{
PropertyDescriptorCollection descriptorCollection;
if (listAccessors == null || listAccessors.Length == 0)
{
descriptorCollection = this._propertyDescriptorsCache;
}
else
{
PropertyDescriptor listAccessor = listAccessors[listAccessors.Length - 1];
FieldDescriptor fieldDescriptor = listAccessor as FieldDescriptor;
descriptorCollection = fieldDescriptor == null || fieldDescriptor.EdmProperty == null || fieldDescriptor.EdmProperty.TypeUsage.EdmType.BuiltInTypeKind != BuiltInTypeKind.RowType ? TypeDescriptor.GetProperties(DataRecordObjectView.GetListItemType(listAccessor.PropertyType)) : MaterializedDataRecord.CreatePropertyDescriptorCollection((StructuralType) fieldDescriptor.EdmProperty.TypeUsage.EdmType, typeof (IDataRecord), true);
}
return descriptorCollection;
}
