Passing a String List in a SOAP request in Flutter - web-services

Question

I am making a SOAP Request and this is how my request should be sent:
<id></id>
<fieldList>
<string>string</string>
<string>string</string>
</fieldList>
This is how I have built my envelope:
final int id = 21;
List<String> fieldList = new List<String>();
fieldList = [
"pinNumber:PIN0000074",
"dispatchArrivedTime:13.05",
"towedStatus:C"
];
var envelope = "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<soap:Envelope "
"xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "
"xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" "
"xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
"<soap:Body>"
"<update xmlns=\"http://example.com/\">"
"<id>${id}</id>"
"<fieldList>${fieldList}</fieldList>"
"</update>"
"</soap:Body>"
"</soap:Envelope>";
final response = await http.post(
'http://example.com/vc/ws/towedvehicletable.asmx',
headers: {
"Content-Type": "text/xml; charset=utf-8",
"SOAPAction": "http://example.com/update",
"Host": "example.com"
//"Accept": "text/xml"
},
body: envelope);
However, this approach does not work. It would be really helpful if somebody could show me how to pass a String List into my request. I am using Flutter and Dart. Thanks

Answer 1

Just map list of strings and then join it:
List<String> fieldList = ['test1', 'test2'];
final xmlValues = fieldList.map((v) => '<string>$v</string>').join();
print(xmlValues);
prints:
<string>test1</string><string>test2</string>
There's also a package for working with XML. It allows you to both parse and construct XML documents.