type'int'不是类型'列表<int>'类型铸造

Question

如何解决这个问题：type 'int' is not a subtype of type 'List<int>' in type cast？现在我正试图做这样的事情：

ElevatedButton(
onPressed: () {
BasesService().SelectBaseAsync(
basesNames?[index]['id]);
},

此外，我试图转换为所需的类型，如basesNames?[index]['id'] as List<int>，但它也返回了相同的错误：type 'int' is not a subtype of type 'List<int>' in type cast

basesNames的打印-[{name: MyDb, id: 4}]

Future<bool> SelectBaseAsync(List<int> integers) async {

final hubConnection = HubConnectionBuilder()
.withUrl(
'http:mysecurelink'
)
.build();
await hubConnection.start();
bool select = false;
List<int>? saveInts;
if (hubConnection.state == HubConnectionState.Connected) {
await hubConnection
.invoke('SelectBaseAsync', args: [integers]).then((value) {
saveInts = integers;
select = value as bool;
});
}
hubConnection.onclose(({error}) {
throw Exception(error);
});
print(saveInts);
print(select);
return select;
}

Answer 1

正如您在print(basesNames)结果中看到的那样，basesNames[index]['id']返回的是int值，而不是list of int，因此您可以更改SelectBaseAsync构造函数以接受int而非List<int>，或者像这样传递值：

BasesService().SelectBaseAsync([basesNames?[index]['id']]);