从多个下拉菜单中获取值，并在flutter中将它们连接为一个

List<String> dropdownOptions1 = ['Option 1', 'Option 2', 'Option 3'];
List<String> dropdownOptions2 = ['Option A', 'Option B', 'Option C'];

String selectedOption1;
String selectedOption2;

DropdownButton<String>(
  value: selectedOption1,
  onChanged: (String newValue) {
    setState(() {
      selectedOption1 = newValue;
    });
  },
  items: dropdownOptions1.map<DropdownMenuItem<String>>((String value) {
    return DropdownMenuItem<String>(
      value: value,
      child: Text(value),
    );
  }).toList(),
),
DropdownButton<String>(
  value: selectedOption2,
  onChanged: (String newValue) {
    setState(() {
      selectedOption2 = newValue;
    });
  },
  items: dropdownOptions2.map<DropdownMenuItem<String>>((String value) {
    return DropdownMenuItem<String>(
      value: value,
      child: Text(value),
    );
  }).toList(),
),

String connectedValue = selectedOption1 + ' ' + selectedOption2;