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並前往https://coderedirect.com/questions/225807/flutter-there-should-be-exactly-one-item-with-dropdownbuttons-value

There should be exactly one item with [DropdownButton]'s value

... detected with the same value 'package:flutter/src/material/dropdown.dart': Failed assertion: ... DropdownButton( items: _salutations .map((String item) ...

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