如何在dart中访问嵌套字典?
我有以下代码:如何在dart中访问嵌套字典?,dart,flutter,Dart,Flutter,我有以下代码: class Dev { static final config = const { 'endpoints': const { 'signIn': '/v1/auth/sign_in', }, 'apiBaseUrl': 'localhost:3000' }; } 我试图访问config变量中的signIn属性,当我配置['endpoints']时,它会正确地访问该属性,但当我尝试时
class Dev {
static final config = const {
'endpoints': const {
'signIn': '/v1/auth/sign_in',
},
'apiBaseUrl': 'localhost:3000'
};
}
我试图访问config变量中的signIn属性,当我配置['endpoints']时,它会正确地访问该属性,但当我尝试时
var signInEndpoint = config['endpoints']['signIn'];
它不起作用,当我尝试时也是一样
var endpoints = config['endpoints'];
var signInEndpoint = endpoints['signIn'];
如何才能正确访问变量中的signIn属性?请提前感谢。这是因为
端点
值是对象
而不是动态
,请尝试以下操作:
var signInEndpoint = (Dev.config['endpoints'] as dynamic)['signIn'];
@Juan你试过两种方法知道吗
Map endpoints = config['endpoints']; //Map<String, String> will be much better
var signInEndpoint = endpoints['signIn'];
还是像这样
class Dev {
static final Map<String, String> endpoints = const {
'signIn': '/v1/auth/sign_in',
};
static final Map<String, String> config = const {
'baseUrl': 'localhost:3000',
'other': 'others'
};
}
var signInEndpoint = Dev.endpoints['signIn']
classdev{
静态最终映射端点=常量{
“登录”:“/v1/auth/sign_in”,
};
静态最终映射配置=const{
'baseUrl':'localhost:3000',
“其他人”:“其他人”
};
}
var signInEndpoint=Dev.endpoints['signIn']
非常感谢,这给了我更多的选择,我想我将使用您给我的第二种方法。很高兴它帮助了您
Map endpoints = config['endpoints']; //Map<String, String> will be much better
var signInEndpoint = endpoints['signIn'];
class Dev {
static final Map<String, Map<String, String>> config = const {
'endpoints': const {
'signIn': '/v1/auth/sign_in',
'apiBaseUrl': 'localhost:3000'
},
};
}
var signInEndpoint = Dev.config['endpoints']['signIn'] //will work
class Dev {
static final Map<String, String> endpoints = const {
'signIn': '/v1/auth/sign_in',
};
static final Map<String, String> config = const {
'baseUrl': 'localhost:3000',
'other': 'others'
};
}
var signInEndpoint = Dev.endpoints['signIn']