private SyntaxNode GetFixedStatement(StatementSyntax statementSyntax) { if (statementSyntax is BlockSyntax blockSyntax) { var fixedStatement = ThrowStatement( ObjectCreationExpression( IdentifierName( nameof(NotImplementedException) ) ).WithArgumentList(ArgumentList()) ); var fixedBlock = blockSyntax.Statements.Insert(0, fixedStatement); return(blockSyntax.WithStatements(fixedBlock)); } // statementSyntax.InsertNodesBefore() return(statementSyntax.InsertNodesBefore( statementSyntax, new[] { ThrowExpression( ObjectCreationExpression( IdentifierName(nameof(NotImplementedException)))) } )); }