Possible null reference assignment.

The variable 'e' is declared but never used

Possible null reference return.

The type 'TIdent' cannot be used as type parameter 'TIdent' in the generic type or method 'IHierarchicalObjectExpander<TIdent>'. Nullability of type argument 'TIdent' doesn't match 'notnull' constraint.

Dereference of a possibly null reference.

Possible null reference return.

XML comment has badly formed XML -- 'An identifier was expected.'

XML comment has badly formed XML -- 'An identifier was expected.'

XML comment has badly formed XML -- 'End tag 'summary' does not match the start tag ''.'