Flutter：在Map（）中使用字符串和布尔值

Question

在Map中同时使用字符串和布尔值返回以下错误，如何同时使用两个值？。

var bodyValues = new Map<String, dynamic>();
bodyValues['accountName'] = accountName;
bodyValues['customerEmail'] = customerEmail;
bodyValues['getAllAvailableBanks'] = false;


final http.Response response = await http.post(
    'https:url',
    body: bodyValues,
   headers:headerValues
);

Answer 1

通过查看HTTP包的代码，可以清楚地看出，如果将map作为body提供，那么它必须是map 。您可以在这里看到强制转换发生的位置：

  @override
  Future<Response> post(Uri url,
          {Map<String, String>? headers, Object? body, Encoding? encoding}) =>
      _sendUnstreamed('POST', url, headers, body, encoding);
...

  /// Sends a non-streaming [Request] and returns a non-streaming [Response].
  Future<Response> _sendUnstreamed(
      String method, Uri url, Map<String, String>? headers,
      [body, Encoding? encoding]) async {
    var request = Request(method, url);

    if (headers != null) request.headers.addAll(headers);
    if (encoding != null) request.encoding = encoding;
    if (body != null) {
      if (body is String) {
        request.body = body;
      } else if (body is List) {
        request.bodyBytes = body.cast<int>();
      } else if (body is Map) {
        request.bodyFields = body.cast<String, String>();
      } else {
        throw ArgumentError('Invalid request body "$body".');
      }
    }

    return Response.fromStream(await send(request));
  }

https://github.com/dart-lang/http/blob/e89b190936d53d0e36148436283e28ba1091b35a/lib/src/base_client.dart#l87