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Accepted
Sandman42
Asked: 2024-09-26 22:18:22 +0800 CST

Dart List 错误类“List”没有未命名的构造函数[重复]

  • 772

我正在尝试通过以下方式创建服务器列表：

class Server {
  final String country;
  final String ip;
  final String username;
  final String password;

  const Server(
      {required this.country, required this.ip, required this.username, required this.password});

  static List<Server> allServers() {
    var myServers = new List<Server>();

    myServers.add(const Server(
        country: "Italy"
        ip: "1.2.3.4.example.com",
        username: "user1",
        password: "password1"
    ));
    myServers.add(const Server(
        country: "United States",
        ip: "5.6.7.8.example.com",
        username: "user2",
        password: "password2"
    ));
    return myServers;
  }
}

我收到错误“类‘List’没有未命名的构造函数”

我该如何修复它？

提前致谢

list

1 个回答

  1. Best Answer

    您的代码几乎正确，但是您遵循了错误的语法。

    请参考以下示例。我刚刚重新起草了您的示例

    
void main() {
  final a = Server.allServers();
  print(a);
}

class Server {
  final String country;
  final String ip;
  final String username;
  final String password;

  const Server({
    required this.country,
    required this.ip,
    required this.username,
    required this.password,
  });

  static List<Server> allServers() {
    /// Here is your mistake
    var myServers = <Server>[];

    myServers.add(const Server(
        country: "Italy",
        ip: "1.2.3.4.example.com",
        username: "user1",
        password: "password1"));
    myServers.add(const Server(
        country: "United States",
        ip: "5.6.7.8.example.com",
        username: "user2",
        password: "password2"));
    return myServers;
  }
}
    • 1

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